Cassette Style AC-DC Converters T Series
Edition 5/5.2000 1/33
500 Watt AC-DC Converters T Series
• Universal AC input range
• DC output voltage for 24 and 48 V loads
• Battery charging for 24, 36, 48 V batteries with re-
mote temperature control
• Telecom rectifier applications
• Immune to transients and disturbances according to
VDE 160 and IEC/EN 61000-4-2,-3,-4,-5,-6
• Very high efficiency, typically 93%
• Power factor >0.96, harmonics <IEC/EN 61000-3-2,
low RFI
• No inrush current, hot plug-in capability
• High power density, 210 W/dm3, rugged mechanical
design
• Very compact 19" cassette (28 TE, 3 U, 160 mm),
Summary
The T series of converters are electrically isolated AC-DC
converters with an output power of up to 550 Watt. For
higher power requirements several units may be connected
in parallel.
The input of the T units is ideally adapted to the mains: Full
power factor correction, no inrush current, low RFI level and
high transient and surge immunity are key design features.
The T units behave similar to a resistive load.
The L-input provides a universal AC-input range from
85...255 V AC. It is the preferred type for 230 V mains,
whereas the U-input range is optimized for 110/120 V
mains. The output delivers an electrically isolated Safety
Extra Low Voltage (SELV) and is short-circuit and no-load
proof. Depending on the type, two output characteristics
are available, intended either for rectifier applications or for
battery charging purposes.
The latter types can be integrated into systems where the
output voltage is backed-up by batteries. The float charge
of the battery can be set by a cell voltage selector switch
according to the battery type used. Moreover these units
feature a temperature sensor input to improve the life ex-
pectancy of the battery.
The rectifier types suit for DC-bus applications at constant
voltage. As the output voltage is SELV, even electrically non
isolated switching regulators such as the PSR types may
be connected to the T output.
The T 1701 types are especially optimized to build distrib-
uted power systems together with the CQ-series DC-DC
converters as the signalling capabilities of both families are
matched. Distributed power systems have as one advan-
tage less power loss over load lines and fewer regulation
problems.
Power-One offers also backplanes for fast and simple set-
up of 19" rack systems with T units (see chapter:
Back
Planes
).
168
6.6"
141
5.6"
28 TE
111
4.4"
3 U
Table of Contents Page
Summary .......................................................................... 1
Type Survey and Key Data .............................................. 2
Type Key .......................................................................... 2
Sensor Type Key .............................................................. 3
Functional Description...................................................... 4
Electrical Input Data ......................................................... 5
Electrical Output Data of the Rectifier Version ................. 7
Electrical Output Data of Battery Charger Version ......... 10
Control Features of the Battery Charger Version ........... 12
Temperature Sensors..................................................... 15
Page
Functional Features ....................................................... 16
Auxilliary Functions ........................................................ 21
Electromagnetic Compatibility (EMC) ............................ 25
Immunity to Environmental Conditions........................... 26
Environmental Conditions .............................................. 27
Mechanical Data ............................................................ 28
Safety and Installation Instructions ................................ 30
Description of Options .................................................... 33
Accessories .................................................................... 33
Safety according to IEC/EN 60950
Universal input range 70...255V AC with PFC
Single outputs up to 56.5 V DC
4 kV AC I/O electric strength test voltage
LGA
Cassette Style AC-DC Converters T Series
Edition 5/5.2000 2/33
Type Survey and Key Data
Table 1: Type Survey (All typical values at 20
°
C)
Output voltage Output current Input voltage range and efficiency Options
U
o set at
U
i nom, 1/2
I
o nom
I
o nom
U
i min...
U
i max
η
min 1
U
i min...
U
i max
η
min 1
[V DC] [A] 70...140 V AC [%] 85...255 V AC [%]
24.25 16 UT 1201-7 2, 4 91 LT 1201-7 2, 6 91 D
25.25...27.25...28.25 14.5 UT 1240-7Z 4, 3 91 LT 1240-7Z 6, 3 92 B1
54.5 10 UT 1701-7 5 92 LT 1701-7 6 93
48 11 ––LT 1702-7 2, 6 93
50.5...54.5...56.5 10 UT 1740-7Z 5, 3 92 LT 1740-7Z 6, 3 93
37.9...40.9...42.4 11 ––LT 1840-7Z 3, 6 91
1Efficiency measured at
U
i nom and
I
o nom.
2Instead of output power limitation, output current limitation.
3Output voltage range controlled by input
U
cr, remote temperature sensor and cell voltage selector switch.
4Reduced output power for
U
i = 70...95 V AC. See
Output Power Limitation.
5Reduced output power for
U
i = 70...100 V AC. See
Output Power Limitation.
6Reduced output power for
U
i = 85...155 V AC. See
Output Power Limitation.
Type Key
Type Key L T 1 7 40 -7 D Z F B1
Input voltage range
U
i
70...140 V, 47...63 Hz ................................ U
85...255 V, 47...63 Hz ................................. L
Series ............................................................................... T
Number of outputs:........................................................... 1
Output
U
o set 24, 27.25 V .................................................. 2
48, 54.5 V .................................................... 7
40.9 V .......................................................... 8
Recifier version .................................... 01, 02 3
Battery charger version.............................. 40 4
Other voltages .................................... 00...99
Ambient temperature range
T
A
–25...71°C .................................................. -7
Customer specific ................................ -0...-6
Auxiliary functions and options
Remote bus voltage monitoring (option) ..... D 1
Cell voltage selector switch ......................... Z 2
Input fuse externally accessible ................... F
Baseplate (option)...................................... B1
1 See also:
Description of Options
as well as data sheet:
Back Planes for the T Series
.
2 Only for T 1240/1740/1840
3 No input for remote temperature sensor
4 With input for remote temperature sensor
Example: LT 1740-7Z: AC-DC converter, input voltage range 85...255 Vrms, single output 50.5...56.5 V DC, 10 A, opera-
tional ambient temperature –25...71°C, with cell voltage selector switch.
Cassette Style AC-DC Converters T Series
Edition 5/5.2000 3/33
Sensor Type Key
Type Key S 48 - 2.23 - 30 - 02
Series ............................................................................... S 1
Battery nominal voltage
24 V ........................................................... 24
36 V ........................................................... 36
48 V ........................................................... 48
Cell voltage (at 20°C)
2.23 V ..................................................... 2.23
2.27 V ..................................................... 2.27 2
Temperature coefficient
–3.0 mV/K/cell ........................................... 30
–3.5 mV/K/cell ........................................... 35
–4.0 mV/K/cell ........................................... 40
–4.5 mV/K/cell ........................................... 45
other temperature coefficients on request .....
Cable length (2 m).......................................................... 02
1Only for LT 1240/1740/1840
2For units without cell voltage selector switch
Cassette Style AC-DC Converters T Series
Edition 5/5.2000 4/33
Functional Description
The T unit is a primary controlled AC-DC converter with a
constant switching frequency of 65.5 kHz. The power factor
corrected single step conversion of the line input voltage to
a low output voltage results in extremely high efficiency.
The input voltage is fed via input fuse, filter and rectifier to
the main transformer. The wideband input filter with small
input capacitance generates virtually no inrush current.
Transient suppressors protect the unit against high voltage
peaks and surges. An auxiliary converter generates an in-
ternal supply voltage for the primary control logic. The input
voltage waveform is sensed by the primary control logic to
allow power factor correction.
The main transformer is connected to a rectifier, large out-
put capacitors and an efficient output filter which ensures
low output ripple and spikes and provides the necessary
hold-up time. The output voltage is fed back to the primary
control logic via a signal transformer.
The inhibit signal and the T failure signal are transferred by
a second signal transformer (no opto-couplers!).
System Good and Output voltage OK are each indicated by
a green LED, inhibit and T System Failure by a red LED.
System Good and Power Down are available as open col-
lector signals at the connector. The threshold level of the
Power Down signal can be externally adjusted at the D set
input.
Test sockets at the front panel allow the measurement of
the output voltage.
The battery charger version provides additional features to
control the output voltage. To set it to different battery float
charge voltages, a 16-step selector switch (Z) is standard.
A control input for remote output voltage adjustment, by an
external temperature sensor is available at the multifunc-
tional inhibit/
U
cr control pin. A trim-potentiometer allows fine
adjustment of the output voltage.
4
6
10
P~
N~
Output Filter
Isolation 4 kV
rms
12
16
18
20
24
26
28
30
32
Vo+
Vo+
Hot-plug +
Hot-plug –
Vo–
Sys In
Sys Out
i/Ucr
D
D set
Vo–
+
–
C
y
C
y
8
Input Filter
Input Filter
Input Filter
Control
Circuit
Voltage
and
System
Monitor
C
y
C
y
Auxiliary
Converter
NTC
22
14
Fuse
C
y
P
Z
C
y
03043
Fig. 1
Block diagram
Cassette Style AC-DC Converters T Series
Edition 5/5.2000 5/33
Electrical Input Data
General conditions:
–
T
A = 20°C
Table 2a: Input Data LT types
Input LT 12xx LT 17xx LT 18xx
Characteristic Conditions min typ max min typ max min typ max Unit
U
iInput voltage range AC 155 255 155 255 130 255 Vrms
with full output power (47...63 Hz)
U
i red Input voltage range with 85 155 85 155 85 130
reduced output power 1
U
i nom Nominal input voltage 230 230 230
I
i nom Nominal input current
U
i nom,
P
o nom 1.9 2.6 2.2 Arms
I
i L Input current limit 3 4 4
P
i 0 No-load input power
U
i min...
U
i max,
I
o = 0 6 8 8 W
P
i inh Input power when inhibited
U
i min...
U
i max, inhibit = low 3 3 3
PF Power factor 2
U
i nom,
I
o nom 96 98 98 %
C
iInput capacitance 3
U
i nom 444µF
t
on Switch on delay
U
i nom,
P
o nom 400 400 400 ms
u
i RFI Input RFI level 4
I
o =
I
o nom BBB
EN 55014, EN 55011/022
U
i p Input overvoltage protection 5 264 264 264 Vrms
U
i L Input undervoltage lock-out 75 75 75 V
F Input fuse 5 × 20 mm 6.3 6.3 6.3 A
f
tr Switching frequency 65.536 65.536 65.536 kHz
Table 2b: Input Data UT types
Input UT 12xx UT 17xx
Characteristic Conditions min typ max min typ max Unit
U
iInput voltage range AC 95 140 100 140 Vrms
with full output power (47...63 Hz)
U
i red Input voltage range with 70 95 70 100
reduced output power 1
U
i nom Nominal input voltage 115 115
I
i nom Nominal input current
U
i nom,
P
o nom 3.8 5.2 Arms
I
i L Input current limit 5 6
P
i 0 No-load input power
U
i min...
U
i max,
I
o = 0 6 8 W
P
i inh Input power when inhibited
U
i min...
U
i max, inhibit = low 3 3
PF Power factor 2
U
i nom,
I
o nom 98 98 %
C
iInput capacitance 3
U
i nom 44µF
t
on Switch on delay
U
i nom,
P
o nom 400 400 ms
u
i RFI Input RFI level 4
I
o =
I
o nom BB
EN 55014, EN 55011/022
U
i p Input overvoltage protection 5 165 165 Vrms
U
i L Input undervoltage lock-out 65 65 V
F Input fuse 5 × 20 mm 10 10 A
f
tr Switching frequency 65.536 65.536 kHz
1The output power is reduced because of the input current limitation
P
o ≈
U
i [Vrms] ¥
I
iL [Arms] ¥ h
2Power factor as a function of the input voltage and load as well as harmonic distortion see
Power Factor, Harmonics
.
3Inrush current stays factor 10 below ETS 300132-1.
4150 kHz...30 MHz: CISPR 11/22/EN 55011/22 class B, 30...300 MHz: CISPR14/EN 55014
5In case of overvoltage the unit switches off temporarily, resulting in reduced output power and increased RFI.
Cassette Style AC-DC Converters T Series
Edition 5/5.2000 6/33
Inrush Current
The T units operate with 4 µF input capacitance resulting in
a low peak current of short duration when the unit is con-
nected to the mains. During switch on the input current can
rise up to the input current limit
I
i L. As a direct result of the
low and short inrush current and controlled charging proce-
dure of the output capacitors, the unit can be hot plugged to
the mains causing only negligible disturbances. The LT in-
rush current is a factor 10 smaller than defined in the ETS
300 132-1 standard for Telecom Systems. However the unit
should be plugged-in smoothly giving time to the output ca-
pacitors to be charged.
Input Under-/Overvoltage Lock-Out
If the specified input voltage range
U
i is exceeded, the unit
stops operation temporarily resulting in reduced output
power and increased RFI. The input is protected by
varistors. Continuous overvoltage will destroy the unit.
If the sinusoidal input voltage stays below the input under-
voltage lock-out threshold
U
i, the unit will be inhibited.
Power Factor, Harmonics
Power factor correction is achieved by controlling the input
current waveform synchronously with the input voltage
waveform. The power factor control is active in all operating
conditions (voltage regulation, output power limitation, cur-
rent limitation). The power factor control also works with dif-
ferent input voltage waveforms and frequencies. Operation
at frequencies above 60 Hz will result in higher leakage cur-
rents. For special applications with different frequencies or
non-sinusoidal wave forms, please contact Power-One.
Input Fuse
An input fuse (5 × 20 mm) fitted in the line (P) path mounted
inside the converter protects the module against severe
defects. (See also:
Safety and Installation Instructions.
) For
applications where the fuse should be accessible: see
Op-
tion F
.
0246810121416
0.80
0.82
0.84
0.86
0.88
0.90
0.92
0.94
0.96
0.98
1.00
PF
I
o
[A]
UT 1740-7Z at U
i
= 110 V
rms
LT 1740-7Z at U
i
= 230 V
rms
04023
0 2 4 6 8 10121416
0.80
0.82
0.84
0.86
0.88
0.90
0.92
0.94
0.96Eff.
I
o
[A]
U
i
= 110 V
rms
U
i
= 230 V
rms
04024
Efficiency
The extremely high efficiency of the T series is achieved by
using a single step power factor corrected converter topo-
logy together with the most advanced technology in power
conversion.
It allows a very compact design in a fully enclosed case
without forced cooling.
357 9 11 13 17 1915 Harm.
3.0
2.5
2.0
1.5
1.0
0.5
0
Ii [mA/W]
3.5
04025
Limit class D according
to IEC/EN 61000-3-2
357 9 11 13 17 1915 Harm.
3.0
2.5
2.0
1.5
1.0
0.5
0
I
i
[mA/W]
3.5
04026
Limit class D according
to IEC/EN 61000-3-2
Fig. 3
Efficiency versus load of LT 1701
Fig. 4
Harmonic distortion at input LT 1740-7Z, U
i
= U
inom
,
I
o
= I
o nom
Fig. 2
Power factor
Fig. 5
Harmonic distortion at input UT 1740-7Z, U
i
= U
inom
,
I
o
= I
o nom
Table 3: Fuse Type
Series Schurter type Part number
LT SP F 6.3 A, 250 V 0001.1012
UT SPT 10 A, 250 V 0001.2514
Cassette Style AC-DC Converters T Series
Edition 5/5.2000 7/33
Electrical Output Data of the Rectifier Version
General conditions:
–
T
A = 20°C, unless
T
C is specified.
–
U
i =
U
i nom,
f
= 50 Hz
Table 4: Output data
Output LT/UT 1201 LT/UT 1701 LT 1702
Characteristic Conditions min typ max min typ max min typ max Unit
U
o set Output voltage adjustment
U
i nom 24.25 54.5 48.0 V
I
o = 0.5 •
I
o nom
U
o set tol
U
o setting tolerance 24.0 24.5 54.25 54.75 47.75 48.25
U
oOutput voltage over input voltage and1 load
U
i min...
U
i max 23.35 24.95 52.8 55.8 46.3 49.3
(See fig.:
Typical output voltage verus I
o = 0.01 •
I
o nom
input voltage and output current.) ...I
o nom
U
o L Output Overvoltage protection by 32.5 59.3 59.3
electronic inhibit
aUo Temperature coefficient of output voltage
T
C fixed value –5–5–5mV/K
I
o nom Nominal output current 16 10 11 A
I
o L Current limit 2
U
o = 20 V 18 4 14.5 14.5
P
o L Output power limit 2
U
i nom 400 550 550 W
u
oOutput voltage noise Low frequency
I
o nom 0.85 1.0 1.05 Vpp
Switching freq. IEC/EN 61204 5 40 40 40 mVpp
Total BW = 20 MHz 0.9 1.05 1.1 Vpp
D
U
o I Static load regulation 1 (See fig.:
Typical I
o = 0.01 •
I
o nom 0.6 1.2 1.2 V
output voltage versus input voltage and ...I
o nom
output current.)
D
U
o U Static line regulation (See:
Typical output U
i =
U
i min...
U
i max 0.3 0.8 0.8
voltage versus input voltage and output I
o nom
current.)
u
o d Dynamic load regulation 3Voltage deviation
U
I nom 1.7 2.2 2.2
t
d (See fig.:
Dynamic cha-
Recovery time
I
o nom ↔ 1/10
I
o nom 0.25 0.25 0.25 s
racteristic under varying
IEC/EN 61204 6
load conditions.)
C
oInternal output capacitance 86 41 41 mF
1Output voltage decreases with rising output current because of output voltage slope for automatic current sharing capability.
2Due to the large output capacitors the maximum transient value can be much higher.
3Deviation limited by output overvoltage protection.
4No power limitation, but current limitation.
5See:
Technical Information: Measuring and Testing.
6See fig.:
Dynamic load regulation
.
Output Characteristics (Recifier Version)
The T 1701/1702 types can be operated in 3 different
modes:
–Output voltage regulation
–Output power limitation
–Output current limitation
–In output voltage regulation mode the T unit can be oper-
ated within the full temperature range –25...71°C.
–In output power or current limitation mode the max. ambi-
ent temperature
T
A should not exceed 65°C with free air
convection cooling.
0 2 4 6 8 10 12 14 16
60
50
40
30
20
10
0Io [A]
Uo [V]
Ui = 110 Vrms Ui = 230 Vrms
Output
voltage
regulation
Output
power
limitation
Output
current
limitation
05045
Fig. 6
Output characteristics LT 1701-7
Cassette Style AC-DC Converters T Series
Edition 5/5.2000 8/33
Hold-up Time (Rectifier Version)
The hold-up time depends upon the output voltage at the
time of failure, the minimum acceptable output voltage and
the load according to the following formula:
U
o2 –
U
o2 min u
t
hold = –––––––––––– • (
C
o +
C
ext)
2 •
P
o
where:
U
o= Output voltage at the moment of mains failure
U
o min u = Minimum acceptable output voltage
P
o= Average output power during hold up time
C
o= Internal output capacitance
C
ext = External output capacitance (e.g. on backplane)
Examples of
t
hold are given in the table below:
Table 5: Hold-up time t
hold
for T1701
U
o = 54 V
U
o min u Unit
P
o [W] 46 V 43 V 40 V 38 V
100 164 219 270 302 ms
200 82 109 135 151
300 55 73 90 101
400 41 55 67 75
500 33 44 54 60
550 30 40 49 55
Output voltage regulation (Rectifier Version)
The output voltage of rectifier models is adjusted to a fixed
value
U
o set. It relates to the output current and the input
voltage which ensures automatic current sharing operation
without further precautions when several units are con-
nected in parallel. Rising output current and falling input
voltage lead to a decrease of the output voltage, according
to the formula:
U
o
≈
U
o set tol + (0.5 –
I
o/
I
onom) • D
U
o l + (
U
i -
U
i nom)/100 V •
D
U
o U
Fig. 7
Typical output voltage versus input voltage and output
current of LT 1701
Note: Units with different output voltage regulation charac-
teristics (e.g. less output current dependency) are available
upon request.
Output power limitation (Rectifier Version)
Especially for power systems with an output voltage of 48V
and more, the rectifier models T 1701/1702 feature an out-
put power limitation mode. The output power is kept con-
stant down to an output voltage of approximately 38 V. This
provides improved start-up capabilities of power systems
including switched mode power supplies connected to the
DC bus (e.g. CQ units). At maximum load there is no need
for a special start-up procedure.
The maximum input current is limited to
I
i L. At lower input
voltage
U
i red the maximum output power is limited to:
P
o ≈ h •
U
i red •
I
i L
(h = efficiency ≈ 90%)
The T 1201 types have no output power limitation charac-
teristic.
Output Overvoltage Protection (Rectifier Version)
A slight output voltage overshoot may occur at turn on, in-
hibit release or during fast load changes. A second, inde-
pendent control loop interrupts operation above
U
o L indi-
cated by the red LED. The output voltage remains below
60 V (SELV) under all operating conditions.
Note: There is no specific built-in protection against exter-
nally applied overvoltages or transient sources like e.g.
motors. Never apply voltages >60 V (>35 V) to the output.
Otherwise the unit may be damaged.
2%
1%
0
–1%
–2%
0.01 0.5 1
I
o
/I
o nom
U
o set
∆U
o
Load
regulation
05081
Output current limitation (Rectifier Version)
The output of the T units is fully protected against continu-
ous short circuit. The maximum constant current is limitted
to
I
o L (see table:
Electrical output data
). As the LEDs indi-
cating the system status are driven from the output voltage,
in short circuit mode all LEDs switch off.
I
o
[A]
0
U
o
[V]
48
04027
11 14.5
38
54.5
10
Fig. 8
Typical output voltage versus output current of UT/LT 1701/
1702
I
o
[A]
0
U
o
[V]
05048
16
24
Fig. 9
Typical output voltage versus output current of UT/LT 1201
Cassette Style AC-DC Converters T Series
Edition 5/5.2000 9/33
U
o
U
o min u
U
t
mains failure
warning time
t
hold
t
U
low load
heavy load
05049
Fig. 10
Hold up and warning time with power down output signal.
The table:
Hold up time
also gives information about the
warning time of the power down signal. If for example the
threshold level
U
t of the power down signal is set to 43 V
and the minimum acceptable voltage of the load is 38 V the
time between the activation of the power down signal and
the switch-off of the load (550 W) will be 15 ms (55 ms -
40 ms).
Pulse Loading (Rectifier Version)
To prevent an overload of the output and filter capacitors
the superimposed AC ripple current at the output should be
limited as shown below. For high current pulse loads exter-
nal capacitors are recommended.
For other pulse loads than stated in the figure below, e.g.
U
i <
U
i nom,
I
o >
I
o nom, please contact Power-One.
15
10
5
0
100 1 k 10 k
I
o PL
[A
rms
]
f
PL
[Hz]
T
C
= 50°C
T
C
= T
C max
U
i
= U
i nom
Average output current = I
o nom
Sinusoidal ripple current
50
05050
Fig. 11
Maximum allowable AC ripple output current superim-
posed on the average output current I
o nom
with LT 1701
unit.
Fig. 12
Dynamic characteristics under varying load conditions
(see: Electrical Output Data)
U
o
t
d
DU
o I
10% DU
o d
t
t
I
o
/I
o nom
1
0.9
0.1
DU
od
05051
U
o
Table 6: Characteristics of the inhibit signal
Characteristics Conditions min typ max Unit
U
inh Inhibit
U
o = on
U
i min...
U
i max 2.5 60 V
voltage
T
C min...
T
C max
R
inh Resistance
U
o = on 30 kΩ
to Vo–
U
inh Inhibit
U
o = off -0.7 0.4 V
voltage
R
inh Resistance
U
o = off 50 Ω
t
rSwitch-on time
U
i nom 100 ms
until full power avail.
P
inh Input power with 3 W
inhibited unit
Fig. 13
Inhibit signal connection
Inhibit input (Rectifier Version)
The rectifier versions are equipped with the inhibit function
only. (The Ucr remote control is used with the battery char-
ger version.)
The unit is enabled by a logic high signal and disabled by a
logic low signal. This input is TTL/CMOS compatible, a re-
sistor <50 Ω disables the unit, a resistor >30 kΩ enables it.
The switch-on time
t
r of the unit, i.e. the time delay between
powering until the full output power is available, is typically
100 ms.
The hold up time at the output after inhibiting depends on
the load, the internal capacitance of the unit and additional
capacitance on the DC bus.
The inhibit input is protected against DC overvoltage up to
60 V.
P~
N~ Vo–
i/U
cr
Vo+
I
inh
U
inh
06116
4
28
12
226 T1000
Cassette Style AC-DC Converters T Series
Edition 5/5.2000 10/33
Electrical Output Data of Battery Charger Version
General conditions:
–
T
A = 20°C, unless
T
C is specified.
–
U
i =
U
i nom, f = 50 Hz
Table 7: Output data
Output LT/UT 1240 LT/UT 1740 LT 1840
Characteristic Conditions min typ max min typ max min typ max Unit
U
o set Output voltage adjustment 1
U
i nom 27.25 54.5 40.88 V
I
o = 0.5 •
I
o nom
U
o set tol
U
o setting tolerance 1 27.2 27.3 54.45 54.55 40.83 40.93
U
o range Output voltage range 2 25.25 28.25 50.5 56.5 37.9 42.4
U
oOutput voltage over input voltage LT
U
i min...
U
i max 26.8 27.6 53.8 55.0 40.3 41.3
and load 3, 1 (See fig.:
Typical output
UT
I
o = 0.01 •
I
o nom 26.9 27.65 54.0 55.1
voltage versus input voltage and ...I
o nom
output current.)
U
o L Output overvoltage protection by 32.5 59.3 48.4
electronic inhibit
a
Uo Temperature coefficient of output voltage
T
C fixed value –3–3–3mV/K
I
o nom Nominal output current 14.5 10 11 A
I
o L Current limit 5 20 14.5 16
P
o L Output power limit 5
U
i nom 400 550 450 W
u
oOutput voltage noise Low frequency
I
o nom 0.71 1.0 0.85 Vpp
Switching freq. IEC/EN 61204 740 40 40 mVpp
Total BW = 20 MHz 0.75 1.05 0.9 Vpp
D
U
o I Static load regulation 3 (See fig.:
Typical I
o = 0.01 •
I
o nom 0.4 0.6 0.6 V
output voltage versus input voltage and ...I
o nom
output current.)
D
U
o U Static line regulation (See fig.:
Typical U
i =
U
i min...
U
i max 0.2 0.35 0.25
output voltage versus input voltage and I
o nom
output current.)
u
o d Dynamic load regulation6Voltage
U
I nom 1.6 2.0 2.5
(See fig.:
Dynamic charac-
deviation
I
o nom ↔ 10%
t
d
teristics under varying
Recovery time
I
o nom80.2 0.2 0.2 s
load conditions without
IEC/EN 61204
battery back-up
.)
C
0
Internal output capacitance 86 41 49 mF
1Output voltage adjustment with
U
cr = 9.5 V (2.27 V/cell).
2Defined by sensor, by remote control and by voltage selector switch.
3Output voltage decreases with rising output current because of output voltage slope for automatic current sharing capability.
5Due to the large output capacitors the maximum transient output current can be much higher than
I
o L
,
P
o L, respectively.
6Without battery backup.
7See:
Technical Information: Measuring and testing.
8See fig.:
Dynamic load regulation. Load current change for specified output. Other outputs loaded with
I
o nom.
Cassette Style AC-DC Converters T Series
Edition 5/5.2000 11/33
–In output voltage regulation mode the T unit can be oper-
ated within the full temperature range –25...71°C.
–In output power or current limitation mode the max. ambi-
ent temperature
T
A should not exceed 65°C with free air
convection cooling.
Output current limitation (Battery Charger Version)
The output of the T units is fully protected against continu-
ous short circuit. The maximum constant current is limitted
to
I
o L (see table:
Electrical output data
). As the LED indicat-
ing the system status are driven from the output voltage, in
short circuit all LED‘s will switch off.
Output voltage regulation (Battery Charger Version)
In normal operating mode (unit neither in power limitation
nor in current limitation) the output is regulated by a voltage
feedback loop. It is adjustet to
U
o set and can be set by the
cell voltage selector switch to the appropriate float charge
voltage of the battery.
The battery charger version features a control input (pin 28)
for remote output voltage adjustment either by a voltage
source, a temperature sensor or an external potential di-
vider (see:
Output voltage control via Inhibit/Ucr remote
control input
). For fine tuning, the units are fitted with a trim
potentiometer accessible from the rear of the connector.
The output voltage relates to the output current and the in-
put voltage which ensures automatic current sharing opera-
tion without further precautions when several units are con-
nected in parallel. An increase in output current and a de-
crease in input voltage decreases the output voltage, ac-
cording to the formula:
U
o
≈
U
o set tol + (0.5 –
I
o/
I
o nom) • D
U
o I
+ (
U
i –
U
i nom)/100 V • D
U
o U
Note: Units with different output voltage regulation e.g.
less output current dependency are available upon request.
1.1%
0.55%
0
–0.9%
0.01 0.5 1
I
o
/I
o nom
∆U
o
Load
regulation
05046
U
o set
Fig. 15
Typical output voltage versus input voltage and output
current of the LT 1740.
Output power limitation (Battery Charger Version)
All battery charger versions feature an output power limita-
tion mode where the output power is kept constant from
2.35 V/cell (for lead acid batteries) to 1.6 V/cell. This pro-
vides better starting up capabilities for power systems in-
cluding switched mode power supplies connected to the
DC bus when the battery is charged.
The maximum input current is limited to
I
i L. At lower input
voltage
U
i red, the maximum output power is limited to:
P
o ≈ h •
U
i red •
I
i L (h = efficiency ≈ 90%)
Typical output characteristics according to type
I
o
0
U
o
26.7 V
06065
15 A 20 A
28.25 V
25.25 V
19 V
I
o
0
U
o
54.5 V
06066
10 A 14.5 A
56.5 V
50.5 V
38 V
Fig. 17
Typical output voltage versus output current of UT/LT 1740
Fig. 16
Typical output voltage versus output current of UT/LT 1240
Output Characteristics (Battery Charger Version)
The battery charger versions T 1240/T 1740/T 1840 series
can be operated in 3 different modes:
– Output voltage regulation
– Output power limitation
– Output current limitation
0 2 4 6 8 10 12 14 16
60
50
40
30
20
10
0Io [A]
Uo [V]
Ui = 110 Vrms Ui = 230 Vrms
Output
voltage
regulation
Output
power
limitation
Output
current
limitation
05045
Fig. 14
Output characteristics LT 1740-7
I
o
0
U
o
40.88 V
06067
11 A 16 A
42.4 V
37.9 V
28.5 V
Fig. 18
Typical output voltage versus output current of
LT 1840
Cassette Style AC-DC Converters T Series
Edition 5/5.2000 12/33
Fig. 19
Dynamic characteristics under varying load conditions
(see Electrical output data) without battery back-up.
U
o
t
d
DU
o I
10% DU
o d
t
t
I
o
/I
o nom
1
0.9
0.1
DU
od
05051
U
o
Dynamic output characteristic
Output Overvoltage Protection (Battery Charger
Version)
A slight output voltage overshoot may occur at turn on, in-
hibit release or during fast load changes. A second inde-
pendent control loop interrupts operation above
U
o L, indi-
cated by the red LED. The output voltage remains below
60 V (SELV) under all operating conditions.
Note: There is no specific built-in protection against ex-
ternally applied overvoltages or transient sources like
e.g. motors. Never apply voltages exceeding
U
o L to the
output. Otherwise the unit may be damaged.
Important: Setting the switch to the correct battery cell
voltage is vital for the proper operation of a battery sys-
tem. Check whether the switch position corresponds to
the required battery cell voltage prior to putting a system
into operation.
Note: Switching to a different cell voltage while the T unit is
in operation may cause a small and short distortion of the
output voltage.
Control Features of the Battery Charger Version
2.23 V 2.24 V
2.25 V
2.26 V
2.27 V
2.28 V
2.29 V
2.30 V
2.31 V
2.32 V
2.35 V
0
4
8
C
06068
Fig. 20
Cell voltage selector switch
Cell voltage selector switch Z
The standard units T xx40-7Z are equipped with the cell
voltage selector switch at the rear side of the unit, which
provides an easy way of external adjustment to the recom-
mended float charge voltage for specific battery types.
Each switch position allows a step in the output voltage of
10 mV/cell whereby the switch position "0" represents a cell
voltage of 2.23 V at 20°C and the switch position "C" gives
2.35 V per cell.
The cell voltage selector switch fits together with the 2.23 V
temperature sensor. The float charge voltage is set by the
switch and the temperature coefficient is specified by the
sensor type.
According to the recommendations of battery manufactur-
ers, the float charge voltage of a lead acid battery should be
temperature compensated. Depending upon the battery
type and size, charging with different temperature coeffi-
cients may be required. An excessive float charge voltage
may damage the battery through overcharging.
Most lead acid battery manufacturers recommend cell volt-
ages between 2.23 V and 2.32 V with the nominal cell volt-
age defined at 20°C and temperature coefficients between
–3 and –4 mV/K/cell.
The value of the negative temperature coefficient, is speci-
fied by the temperature sensor.
With the cell voltage selector switch Z the required cell volt-
age can be adjusted at the rear of the unit, making the sys-
tem flexible to different float charge voltages of battery sys-
tems.
Where the selector switch Z is not applicable, a cell voltage
adjustment can also be provided via the temperature sen-
sor (see:
Temperature Sensor
).
Although it is not recommended, the output voltage can be
set to a fixed value without temperature compensation by
an external voltage source or a resistive voltage divider at
the remote control input (e.g. if the battery temperature
shall be controlled by other systems, see:
Output voltage
control via Inhibit/Ucr remote control input
).
What needs to be considered with all battery charger types:
The final float charge voltage is only reached with a fully
loaded battery. Since new batteries directly supplied from
the manufacturer are only charged to 70...80% of their ca-
pacity, the battery system should be operated for min. 72 h
prior to checking the float charge voltage.
Cassette Style AC-DC Converters T Series
Edition 5/5.2000 13/33
The Inhibit/Ucr remote control input at connector pin 28 pro-
vides two functions:
–External adjustment of the output voltage
–Inhibiting of the unit
A voltage <0.4 V inhibits the output, a voltage >2.5 V ena-
bles it.
By the Ucr remote control input range of 5.5 V < U
cr
< 11.5 V, the output voltage
U
o set can be adjusted within a
range of +3.6% to –7.9%. This feature is optimized to con-
trol the float charge of lead acid batteries.
Outside of the control range, the sensor monitoring circuit
generates a system error signal (see also:
System Good).
In the case of a excessively high control voltage, the output
is reduced.
The remote control input is protected against DC overvolt-
age up to 60 V .
50.5
52
53
54
55
56.5
U
o
[V]
345 5.5 11.5 14 16 U
cr
[V]
Logic level of
System
Good
signal
Signal high
Signal low
37.85
39
41
42.37
25.25
26
27
28.25 06069
T 1240 T 1840 T 1740
U
cr
[V]
5.3 V 14 V
Fig. 21
Output voltage U
o
versus control voltage U
cr
, with corre-
sponding system good signal level
Output voltage control via Inhibit/Ucr remote control input.
Table 8: Characteristics of the inhibit signal
Characteristics Conditions min typ max Unit
U
inh Inhibit voltage
U
o = on
U
i min...
U
i max 2.5 60 V
R
inh Resistance to Vo-
U
o = on
T
C min...
T
C max 30 k Ω
U
inh Inhibit voltage
U
o = off – 0.7 0.4 V
R
inh Resistance to Vo-
U
o = off 50 Ω
t
rSwitch on time until full power available
U
inom 100 ms
P
inh Input power at inhibited unit
U
inom 3W
Table 9: Characteristics of the remote control
Characteristics Conditions LT/UT 1240 LT 1840 LT/UT 1740 Unit
typ typ typ
U
oOutput voltage at: Voltage selector 25.25 37.85 50.5 V
U
cr fail 2.5...5.5 V switch Z set at
U
cr control 5.5...11.5 V 2.23 V/cell or without 22.5 +
U
cr • 0.5 33.75 +
U
cr • 0.75 45 +
U
cr
U
cr clamp 11.5...14 V selector switch 28.25 42.37 56.5
U
cr fail 14...60 V
U
i nom
25.25 37.85 50.5
R
cr Input impedance
0.5 •
I
o nom
111MΩ
f
cr Frequency limit 1 1 1 Hz
Potentiometer for fine tuning
T units are fitted with a one-turn potentiometer for fine tun-
ing of the output voltage to within ±3.70/00 of
U
o. The
potentiometer is protected by a plastic cover. To adjust the
output voltage for improved current sharing or compensa-
tion for voltage drops over the load lines, each of the T units
in a system should be unplugged and adjusted individually
to the same output voltage at equal load; otherwise current
sharing may adversely be affected.
Note: An open inhibit/Ucr remote control input leads to a
sensor error signal which is indicated by the Error LED at
the front and high impedance of the "System good" signal.
The output voltage is reduced to
U
cr fail condition.
If the voltage selector switch Z is not set at 2.23 V per cell,
the
U
cr fail voltage rises accordingly.
The inhibit input of the T xx40-7Z is not TTL/CMOS compat-
ible and should be triggered by a switch, a relay or an open
collector transistor.
Cassette Style AC-DC Converters T Series
Edition 5/5.2000 14/33
Ext. voltage
source
5.5...11.5 V
+
–
Vo–
i/Ucr
U
cr
28
22
05062
Fig. 23
Voltage setting by an external voltage source
Remote control by a resistive potential divider
With a resistive potential divider or a potentiometer con-
nected to the remote control input, a fixed output voltage
can be programmed:
Fig. 22
Voltage setting by a resistive potential divider
U
cr =
U
o – 45 V (LT/UT 1740)
U
cr =
(U
o – 33.75 V) • 4/3(LT 1840)
U
cr = 2 •
U
o – 45 V (LT/UT 1240)
U
o •
R
2
U
cr
= ––––––––
(
R
1 +
R
2)
R
2: Value with 1 MΩ internal resistance in parallel with
R
.
It is mandatory that:
(
R
1
•
R
2)
––––––– >35 kΩ
(
R
1
+
R
2)
otherwise the unit might not be able to start.
Vo+
i/Ucr
Vo–
1 MΩR
U
o
–
U
o
+
R
1
R
2
= 1 MΩ • R/(1 MΩ + R)
28
U
cr
12
22
05063
Fig. 24
Voltage setting by a temperature sensor, wiring diagram
The temperature sensor provides a temperature compen-
sated charging process for lead acid batteries, see also:
Temperature Sensors
.
+–
Battery
Vo+
i/Ucr
Vo–
Temperature
sensor
Sensor
cable
Sensor
wires
+–
28
05064
12
22
T
green
brown
white
Remote control by a temperature sensor
Remote control by an external voltage source.
Cassette Style AC-DC Converters T Series
Edition 5/5.2000 15/33
Temperature Sensors
The active T temperature sensors are of robust construc-
tion, mounted into a sealed aluminium tube of 12 mm outer
diameter and 50 mm length. The sensors are water proof
(IP 66) and high voltage tested with 1.4 kV DC. Connection
should be done via the colored 3-wire cable to the T unit
output (Vo+ and Vo-) and the remote control input
U
cr.
Wrong connection may damage the sensor.
The temperature sensor should be as close to the battery
terminal as possible for most accurate temperature meas-
urements.
Sensor
20/22
Vo–
12/14
Vo+
28
i/Ucr
brown
white
green
05065
Fig. 25
Wiring diagram sensor
Table 10: Type survey
Sensor types Battery voltage Float charge Cell voltage Temp. coefficient Cable length
nominal [V] voltage (20°C) [V] (20°C) [V/cell] [mV/K/cell] [m]
S24-2.23-30-02 124 26.76 2.23 –3.0 2
S24-2.23-35-02 124 26.76 2.23 –3.5 2
S36-2.23-30-02 1 36 40.14 2.23 –3.0 2
S36-2.23-35-02 136 40.14 2.23 –3.5 2
S48-2.23-30-02 148 53.52 2.23 –3.0 2
S48-2.23-35-02 148 53.52 2.23 –3.5 2
S48-2.27-30-02 248 54.48 2.27 –3.0 2
S48-2.27-35-02 248 54.48 2.27 –3.5 2
1Standard types for conventional tubular lead acid batteries. The same sensor can be used for battery systems with different cell volt-
ages within the selectable range of Z. Each step on the selector switch changes the cell voltage by 10 mV in the range from 2.23 V up
to 2.32 V, at 20°C.
2Standard types for sealed lead acid batteries for LT 1740 without option Z.
Battery specific sensors with cell voltages from 2.23 V up to
2.32 V and temperature coefficients from –2 up to –4.5 mV/
K/cell or different cable lengths are available upon request.
Important remarks
Note 1:
By choosing a battery with a large temperature coefficient
or with a high cell voltage, the required temperature range
may be limited by the output voltage control range of the T
unit(s).
Note 2:
The temperature sensor together with the mounting fixture
should be mounted as close as possible to the battery.
Through their chemical activity batteries may be warmer
than the ambient temperature. Battery banks heat up if they
are mounted too close together thus blocking free air flow.
Since battery life is halved with every 10 K temperature in-
crease, it is recommended that the batteries be mounted at
the bottom of the cabinet or in a separate, cool area.
Note 3:
The sensor supply wire Vo+ (brown) should be refered to
the T unit output pin 12/14. If the sensor common (green)
wire is connected to the power bus, resistive voltage drops
or voltage drops across decoupling diodes in the Vo– sup-
ply line will be compensated by the sensor.
Decoupling diodes or fuses in the Vo– supply line are not
recommended as in case of a short circuit across the output
of a T unit, status signalling of the system is affected.
Note 4:
For installation of batteries see also VDE 510 as well as the
recommendations of the battery manufacturers.
Table 11: Sensor data
Characteristics Condition min typ max Unit
T
sensor Sensor temperature range
U
cr = 5.5...11.5 V –10 60 °C
U
cr Control voltage range Absolute
ratings 3.9 15 V
U
cr td Control voltage tolerance
T
sensor = 20°C±0.1
T
sensor = 0...53°C±0.2
Cassette Style AC-DC Converters T Series
Edition 5/5.2000 16/33
Table 12: Calculation of Rext
Types
U
t >
U
t set
U
t <
U
t set
(
R
ext. connected to Vo–)(
R
ext. connected to Vo+)
T 12xx 463.5 43.2
U
t – 463.5
R
ext (
U
t) = –––––––– [kΩ]
R
ext (
U
t) = ––––––––––––– [kΩ]
U
t –21.0 21.0 –
U
t
T 17xx 933 43.2
U
t – 933
R
ext (
U
t) = –––––––– [kΩ]
R
ext (
U
t) = ––––––––––––– [kΩ]
U
t – 42.5 42.5 –
U
t
T 18xx 461 21.4
U
t – 461
R
ext (
U
t) = –––––––– [kΩ]
R
ext (
U
t) = ––––––––––––– [kΩ]
U
t – 32.0 32.0 –
U
t
Functional Features
Available Signals and Status Monitoring
The T series feature an inhibit function as well as several
voltage monitoring and indicating functions for easy control
and surveillance of a complete custom specific power sup-
ply system. All the surveillance functions are driven from
the T output potential and also operate in case of a mains
failure down to an output voltage of 5 V. The power con-
sumption of the surveillance circuit is typically 10 mA to
20 mA.
Available functions:
–Power Down D pin 30
D set pin 32
–System Good Sys In pin 24
Sys Out pin 26
–Inhibit/Ucr remote control i/Ucr pin 28
(see Chapters:
Rectifier
respectively:
Battery Charger
)
Optical status monitoring is indicated by 3 LEDs on the front
panel:
–System (OK) green
–
U
o(OK) green
–Error red
Test sockets at the front panel allow easy measurement of
the output voltage.
Power Down
The power down circuitry monitors the output voltage and
changes its output signal status from low to high impedance
when the output voltage falls below the low threshold level
and changes back to low impedance, when the output volt-
age exceeds the upper threshold level. The rectifier ver-
sions have a relatively small hysteresis of 1 V, the battery
charger versions have a large hysteresis. The upper
threshold level is given the low threshold level is externally
adjustable at the D set pin 32. Power Down can for example
be used as a save data signal, for low voltage warning, as a
low battery signal to avoid deep discharge of the battery
during long term mains failure or to prevent connected con-
verters from starting-up at a low bus voltage. For applica-
tion examples see figures below for power down use.
As it is driven from the output, power down operates inde-
pendently of the input voltage and load conditions, even if
the unit is inhibited.
The standard version monitors the output voltage internally
(see fig.:
Standard version; Power down signal monitoring
directly the output of the T unit
).
Vo+
Vo–
D set
T 1000-7
R
ext
External adjustment
of the threshold
level U
t
R
–+
06050
12
22
32
43.2 kΩ
(21.5 kΩ)
Fig. 26
Standard version; Power down signal monitoring directly
the output of the T unit.
Vo+
Vo–
D set
T 1000-7D
Rext External adjustment of
the threshold level Ut
R
43k2
(21k5)
–+
F
06051
12
22
32
Fig. 27
With Option D; Power down signal monitoring the power
bus decoupled by a fuse.
Lower threshold level
With the resistor (
R
ext) connected to D set input pin 32 and
Vo- (or Vo+) the low threshold level can be increased (or
decreased) respectively. (See fig. above)
If the D set input is left open the low threshold level of the
power down signal is factory set to:
T 12xx:
U
t set = 21.0 V ±0.4 V
T 17xx:
U
t set = 42.5 V ±0.5 V
T 18xx:
U
t set = 32.0 V ±0.4 V
The approximate resistor values for given threshold levels
can be calculated from the following formulae; (
U
t in V):
With option D the output voltage can be sensed externally
for example to monitor the system bus decoupled from the
power supplies by diodes or fuses.
With option D a resistor of 43.2 kΩ 1% (21.5 kΩ for T 1840)
should be fitted externally into the sense line to the bus (see
fig.:
With option D; Power down signal monitoring...
).
Cassette Style AC-DC Converters T Series
Edition 5/5.2000 17/33
Power down output signal characteristics
The power down output D is an open collector transistor
referenced to Vo–, protected by a 62 V Zener diode, and is
well suited to driving an external relay.
Under normal operating conditions (
U
o >
U
t) the power
down output D has low impedance. If the output voltage
drops below the power down threshold level, the signal out-
put becomes high impedance.
Table 14: Characteristics of Power Down functions
Characteristics Conditions min typ max Unit
I
DOutput
T
C min...
T
C max 50 1 mA
sink current
U
sat
U
saturation
I
D = 50 mA 0.2 V
U
zZener voltage 62
P
zZ-diode
P
LOSS
T
C = 95 °C 500 mW
1 To be limited to 50 mA by the external circuitry.
Vo+
D
30
Vo–
D set
32
T 1000
Rext
06053
12
22
Fig. 29
Power Down
– External adjustment of threshold level U
t
– Signal electrically isolated by an external relay
Fig. 30
Remote indication of Power Down by LED
red LED
Vo+
D
Vo–LED is "ON"
in case of
power down
R
T 1000
06054
12
30
22
Fig. 31
Remote indication of the output voltage status by CMOS/
TTL interface for e.g. Save Data
Vo+
D
Vo–
T 1000
+5 V
CMOS, TTL
R
06055
12
30
22
The threshold level is adjusted to a DC output voltage.
When in operation a sinusoidal low frequency output ripple
is superimposed on the DC output voltage. It can be esti-
mated with
U
ov =
I
o/(2 • π •
f
•
C
o) where
C
o is the internal
capacitance of the output of the unit.
Table 13: Resistor values (R
ext
) for given Power Down
threshold value U
t
for LT 1740 (typical values)
Characteristics Conditions
U
tUnit
U
tPower Down 69 kΩ to Vo+ 34.4 V
threshold level set by 106 kΩ to Vo+ 36.4
R
ext
254 kΩ to Vo+ 39.5
left open 42.5
309 kΩ to Vo–45.5
154 kΩ to Vo–48.5
102 kΩ to Vo–51.6
Upper threshold level
The upper threshold level of the Power down function is
given.
The rectifier units T xx01/02 have a relatively small hyster-
esis of 1 V to prevent oscillation of the signal.
The battery charger units T xx40 have a large hysteresis.
The upper level is set at 2.05 V/cell.
To avoid deep discharge of the battery which would de-
crease the life expectancy, its load should be disconnected
from the battery at the low level of the Power down signal.
The battery voltage will then recover slowly up to its chemi-
cal equilibrium, about 2 V/cell. The load may not be con-
nected again to the battery until the T unit is operating and
charging it. Then the output voltage will be higher than
2.05 V/cell
High level of Power down signal
T 1240: 24.6 V ±0.3 V
T 1740: 49.2 V ±0.5 V
T 1840: 36.9 V ±0.4 V
UBat
Ufloat Battery
recovery
Battery
low
Mains failure Return of mains
Hysteresis
Power Down
Load switch ON
Load switch OFF
t
Ut
Z
t
high
low
Power down signal
2.05 V/cell
2.0 V/cell
06052
Fig. 28
Hysteresis of power down signal for battery charger types
with corresponding level of power down signal
Cassette Style AC-DC Converters T Series
Edition 5/5.2000 18/33
Sys Out
26
Sys In
24
Logic high if no internal
T unit error and no inhibit
I
Sys In
Logic high if
I
Sys In
> 100 µA
+
–
I
Sys Out
Vo+
12
Vo–
22
Ref.
Logic AND
06057
Fig. 33
Equivalent circuit of system good input and output
Signal input:
The system good input (Sys In) can be voltage or current
driven. To trigger the internal comparator, the voltage at the
Sys In pin has to be <6.2 V if voltage driven. If current
driven, the sink current to Vo– has to be >100 µA. An easy
way to drive the system good input is achieved by means of
an open collector transistor, or a 10 V CMOS interface.
(See figures below)
Note: If only the internal status of a T unit is to be moni-
tored, Sys In has to be connected to Vo–.
Vo+
Sys Out
Vo–
T 1000
No external free-
wheeling diode across
relay necessary
26
06060
12
22
Fig. 34
System status signal electrically isolated by an external
relay
Signal output:
The system good signal output (Sys Out) is an open collec-
tor transistor referenced to Vo–, protected by a 62 V zener
diode. The output is well suited for relay applications.
Fig. 32
Power Down used as inhibit to enable a system start-up in
case of subsequently connected step-down converters
PSK/PSR with low start-up voltage. (For CQ units no pull-
up resistor is required.)
Vo+
D
Vo–
T 1000
Vi+
i
Gi–PSK/PSR
10 kΩ
0.5 W
06056
12
30
22
System Good
The system good signal provides information about the
general function of the T 1000.
It can be used to monitor the status of a single T unit or can
be linked with other signals within a power system to drive
one single logic signal for the status of the whole system by
Table 15: Characteristics of the system good input and output
Characteristics Conditions min typ max Unit
I
Trig Trigger level for logic current driven
U
i min...
U
i max 100 µA
U
Trig low input (= System OK) voltage driven
T
C min...
T
C max – 0.4 6.2 V
I
Trig Trigger level for logic current driven 0 A
U
Trig high input (= System Failure) voltage driven >7.5 60 V
I
sys Output sink current 1 50 mA
U
sat Saturation voltage
I
Sys Out = 50 mA 0.2 V
U
ZZener voltage protection diode 62
P
ZPower disipation Zener diode
T
C = 95°C 500 mW
1To be limited to 50 mA by the external circuitry.
connecting the output of the system good signal of one unit
to the input of the next unit. Low voltage (impedance) of the
input and output has the meaning of "System good". The
first input of the system has to be connected to Vo–.
The signal "System good" is activated (low impedance) if
the following conditions are met:
No external fault
– The Sys input signal is logic low
AND
No faults monitored by the T unit such as:
–Input overvoltage
–Input undervoltage (mains failure)
–Output overvoltage
–Output short circuit
–Internal overtemperature
–Internal circuit fault
–Inhibit/Ucr remote control input error such as (inhibit)
voltage < 2.5 V (rectifier type); control voltage out of
range 5.3 V >
U
cr > 14 V (battery charger type) or sensor
not connected, open remote control input.
Cassette Style AC-DC Converters T Series
Edition 5/5.2000 19/33
Connection in Series of Power Down and System
Good (Examples)
To achieve a logic OR function of the system good and
power down signal connect the D output to Sys In. The de-
sired function is then obtained from the system good out-
put. The output signal becomes high if the output voltage is
lower than the threshold of the power down circuit, inhibit is
applied or an internal error has occurred.
Internal
signals
20/22
Vo–
24
Sys In
26
Sys Out
Vo+
28
Inhibit
30
D
32
D set
Vo+
R
T 1000
06061
Fig. 35
System Good and Power Down connected in series.
Note: Output signal will indicate error at start-up.
Vo+
Sys Out
Vo–
T 1000
Sys In
Vo–
Vo+
Sys Out
Vo–
T 1000
Vo–
Overall
System
Good
Output
Control
Circuit
1 k
20 V
Output
Control
Circuit
1 k
20 V
Output
Control
Circuit
1 k
20 V
06059
CQ1
CQ2
CQn
22 22
22
24 12
26
24
26
12
Sys In
Fig. 36
Wired AND of electrically isolated open collector signals
(e.g. the OUT OK signal of CQ units) with the system
good signals of T units in series to achieve one signal
about the status of the whole system
Paralleling of Power Down and System Good
(Example)
To achieve a logic AND function of the System Good and
Power Down connect the D output with the system good
output. This combination generates an output signal only in
case of severe system errors. Only a T system fault to-
gether with a simultaneous Power Down of the output volt-
age will cause this output signal to become high imped-
ance.
Internal
signals
20/22
Vo–
24
Sys In
26
Sys Out
Vo+
28
Inhibit
30
D
32
D set
Vo+
R
T 1000
06062
Fig. 37
System Good and Power Down connected in parallel.
Cassette Style AC-DC Converters T Series
Edition 5/5.2000 20/33
Display Status of LEDs
LED Sys OK (green)
corresponds to the system good signal. The LED is ON if no
internal or external error is detected.
LED
U
o OK (green)
indicates the output voltage status. It corresponds to the
power down signal. The LED is ON as long as
U
o has ex-
ceeded the upper threshold level and has not fallen below
the low threshold level
U
t.
LED Error (red)
is ON if one or more of the following conditions is detected:
– Input overvoltage
– Input undervoltage (mains failure)
– Output overvoltage
– Output short circuit
– Output voltage below threshold
U
t
– Internal overtemperature
– Internal circuit fault
– Inhibit/Ucr remote control input error such as:
– (inhibit) voltage <2.5 V rectifier type
– Remote control voltage out of range
(5.3 V >
U
cr > 14 V) battery charger type
– Sensor not connected, open remote control input
Table 16: System monitoring
Signal status and LED display status depending on the situation of the various system elements
Possible Situation Open collector output LED
System Good Power Down Sys OK
U
o OK Error
All OK low low on on off
No mains and battery OK or no mains and
U
o >
U
t2high low off on on
Unit inhibited and battery OK or unit inhibited and
U
o >
U
t2
Internal error 2
System good input logic high 3high low off on off
No mains and battery low or no mains and
U
o <
U
t2high high off off on 1
Short circuit on LT output,
U
o < 4 V high high off off off
Current limit LT output,
U
o > 4 V,
U
o <
U
t 2 low high on off on
Battery charger type T xx40: sensor not connected or out of range high low off on on
1LED is on until the output capacitors are discharged.
2Sys In connected to Vo–.
3Sys In not connected to Vo– (single T status monitoring) or system status monitoring (see:
System Integration
).
Cassette Style AC-DC Converters T Series
Edition 5/5.2000 21/33
Auxilliary Functions
Connection in Parallel and in Series
The output of the T units may either be connected in series
or in parallel.
Connection in parallel: Current sharing between paralleled
units is ensured by the output characteristic slope. Several
T units may be connected in parallel.
Connection in series: A maximum of 2 T units may be con-
nected in series, however the resulting output voltage of up
to 110 V would no longer be SELV. For safety reasons the
installation at the output should be protected with supple-
mentary insulation (IEC/EN 60950).
Power Boosting, Redundant Configuration,
Hot Plug-in
For redundant configurations the outputs should be de-
coupled to protect the DC-bus in case of an internal short
circuit at the output of any of the paralleled T units.
Decoupling may either be done using series diodes or us-
ing appropriate fuses in the output path of each T unit. If the
battery voltage is to be monitored, choose T units with op-
tion D.
Decoupling diodes provide reverse polarity protection with
no reverse current in case of hot plug-in, but have the dis-
advantage of the forward voltage drop over the diode and
higher power loss.
For battery applications decoupling of the T units with fuses
is recommended since the voltage drop over the decoup-
ling diodes would decrease the float charge voltage of the
battery. In case of an internal short circuit at the output of a
charger unit the battery will deliver a very large current
causing the respective fuse to blow. The fuse should be
mounted in the positive power path of the converter since
the monitoring signals of the T units are referenced to the
negative path. The fuse type should be suitable for DC ap-
plication having a current rating of 20 A or more with high
breaking capability, e.g. Littlefuse, series 314.
Several T xx40 battery charger units connected in parallel
can be controlled by a single voltage source or a single sen-
sor wired to the remote control inputs. If sensors are con-
nected in parallel (redundant configuration), they should be
decoupled by 200 kΩ resistors, (see fig.:
Sensors con-
nected in parallel
). An individual sensor for each paralleled
T unit is not recommended because current sharing is af-
fected by the sensor tolerance.
The remote control input of the T xx40 units allows hot plug-
in to an operating battery system with a single sensor with-
out affecting the float charge voltage.
Fig. 38
Sensors connected in parallel.
Sensors in parallel provide redundant voltage adjustment
in case of one of the sensors in open circuit or short circuit
(add. external components required)
Vo+
Vo–
i/Ucr
T xx40 Sensor Sensor
200 k 200 k
12
22
28
06078
+
–
T 1000 T 1000
Vo–
Vo+
Vo–
Vo+
06077
Fig. 39
T unit without battery back-up in redundant configuration
To enable hot plug-in in systems decoupled with fuses the T
series is fitted with an NTC resistor limiting the reverse cur-
rent flowing into the discharged output capacitors (see:
Functional Description
).
For this purpose the pins 16 and 18 have to be connected
to Vo+ and Vo– respectively (see fig.:
T xx40 with battery
back-up
).
Since pins 16 and 18 are leading pins, the output capacitors
are precharged through the internal NTC resistor prior to
any other pin making contact. This protects the connector
and prevents the DC bus voltage from dropping during hot
plug-in. Hot plugging should be done gently. Subsequent
hot plug-out/plug-in of a unit with a hot NTC should be
avoided as current limiting will be poor. After disconnecting
an operating unit it should be cooled down prior to recon-
necting to the bus to avoid damage of the fuse or the con-
verter.
Note: The internal NTC limits the reverse charge current
flowing into the output capacitors of a T unit when it is
plugged into a battery buffered bus. Should however the T
unit already be connected when the battery is switched to
the bus, the resulting charge current will not be limited. To
avoid the fuse to blow or a possible arc across the circuit
breaker, the T units should be switched on to the mains
prior to connecting the battery. With decoupling diodes, no
reverse charge current flows from the power bus into the T
output capacitors.
+
–
Vo–
Vo+
Vo–
Vo+
T xx40 T xx40
HC–
HC+
HC+
HC–
Fuse Fuse
+
–
D set
R 43k2 R 43k2
D set
(21k5) (21k5)
06079
Fig. 40
T xx40 with battery back-up. Power Down signal monitor-
ing the battery voltage.
Cassette Style AC-DC Converters T Series
Edition 5/5.2000 22/33
Battery Size and Ripple Current
Some consideration should be given to the selection of the
battery size. According to VDE 0510 part 2, the low fre-
quency ripple current of the floating charge current should
not exceed 5 Arms per 100 Ah capacity (0.05 C). The power
factor corrected single step conversion of the line input volt-
age to the low DC output voltage generates a ripple voltage
at the output of twice the input frequency, causing a ripple
current into the connected battery.
For systems where only a small battery back-up time is re-
quired, battery charging by one T unit may be sufficient (see
also fig. below).
For systems with more than one T unit charging the battery
please refer to the chapter:
Back Plane
.
T 1000
U
o
: 56.0 V
T 1000
U
o
: 56.0 V
T 1700-7D
U
o
range
50.5...56.0 V
Battery
+
–
Load
06081
Fig. 41
Alternative configuration for a larger system with a small
battery
If the ripple current is too high e.g. in the case of a smaller
battery to be connected to the system, a large capacitor
with low impedance can be connected in parallel with the
battery. Another possibility is to connect an additional im-
pedance to the battery line, e.g. a choke or an NTC-resistor
(30 A or 60 A chokes are available on request. Please con-
sult Power-One's application center). Further considera-
tions for the selection of battery size include desired back-
up time, required battery life, temperature range and maxi-
mum permissible discharge current. Consult the manufac-
turers of lead-acid batteries for the final selection.
Caution: Lead-acid batteries can generate certain
amounts of H2 and O2 gas which can form explosive gas
mixtures. Sufficient ventilation must be provided in bat-
tery cabinets and installation rooms.
Local regulations must be observed. Further information
about designing battery systems is contained in VDE 0510,
part 2.
Combination of T Units and CQ Units without Battery
In a complete power system consisting of two or more T
units in parallel combined with CQ units it may be desirable
to have one common signal indicating the status of the
whole system.
The CQ units provide a galvanically isolated signal Out OK.
To obtain a logic AND all CQ Out OK signals should be con-
nected in series (see also fig.:
Wired AND of galvanically
isolated open collector signals
). Out OK– of the first CQ unit
should be connected to Vo–, Out OK+ of the last CQ unit
should be connected to pin Sys In of one of the T units. Sys
Out should be connected to Sys In of the next T unit. If one
of the units fails (T or CQ ) it will be indicated by the overall
System Good (see fig. below).
If in a system with 2 redundant T units Power Down is de-
sired as one common signal, independent of a possible fail-
ure of one of the two T units, simply interconnect the D pins
of the two T units. In this way Power Down only becomes
active if both T units fail which would result in the bus volt-
age falling (see fig. below).
Note: Consider the behaviour of the signalling in a system
with decoupling diodes or fuses in the case of a T-failure,
with the secondary in short circuit.
Fig. 42
Monitoring of overall System Good and Power Bus Down
in a redundant system
+
–
Out OK–
Out OK+
+
–
CQ 1
+
–
Out OK–
Out OK+
+
–
CQ 2
+
–
Out OK–
Out OK+
+
–
CQ 3
P
NVo+
Vo–
T 1701
P
N
Vo+
Vo–
P
N
Sys Out
Sys Out
Sys In
D
T 1701
Sys In DOverall
System
Good
Power
Down
+
+
–
–
R
R
06082
Cassette Style AC-DC Converters T Series
Edition 5/5.2000 23/33
Storing the System Good Signal
For battery back-up systems located in inaccessible areas
it could be of interest to know, whether there has been a
Power Fail (interruption of the mains). To obtain this infor-
mation Sys Out should be connected to Sys In with a reset
button connected to Vo–. In this way a system failure like an
interruption of the mains will be stored at Sys Out until the
reset button is pressed.
Low Battery Discharge Protection
Since all monitoring functions are powered by the output of
the T unit or the battery in the case of a mains failure, Power
Down can be used to monitor the status of the battery and
to disconnect the load or part of it via the inhibit of the CQ
units when the battery voltage drops below the threshold
level of the Power Down. This prevents further discharge of
the battery. See also:
Power Down
.
+
–
+
–
CQ
P
N
P
N
Sys Out
Sys In
T 1740-7DZ
+–
Vo+
Vo–
Fuse
Vo+
Stored
Sys Out
Reset
R
+
–
HC–
HC+
06084
Temp. sensor
Fig. 44
Storing the System Good signal
Fig. 43
Disconnecting the loads at low battery voltage in case of
mains failure
Fig. 45
UPS uninteruptable power supply system
T
1740-7DZ
CQ
CQ
CQ
CQ CQ
CQ CQ
CQ
T
1740-7DZ
System
Controller
48 Vnom Power Bus (SELV)
(50.5...56.5 V DC)
Back-up
battery
48 V
12 V, 16 A
(8 A*)
24 V, 8 A
(4 A*)
+5.1 V, 64 A (48 A*)
Power down
DC bus good
Output good
N P
+
–
* For redundancy,
decoupling at the
CQ-outputs with
diodes is required.
Fuse
Fuse
06085
Temp. sensor
+
–
Out OK–
Out OK+
+
–
CQ
+
–
Out OK–
Out OK+
+
–
CQ
+
–
Out OK–
Out OK+
+
–
CQ
P
N
P
N
Sys Out
Sys In
D
T 1740-7DZ
+–
i
i
i
Vo+
Vo–
D set
Fuse
43.2 kΩ
Rext
+
R
Vo+
HC+
HC–
–
06083
Temp. sensor
Cassette Style AC-DC Converters T Series
Edition 5/5.2000 24/33
CQ
1001-6R
CQ
2320-7R
PSB
245-7R
T 1701
System
Controller
48 V DC
nom
Power Bus (SELV)
(53…56 V DC)
Cooling fan
±12 V, 4 A +24 V, 5 A
+5.1 V, 32 A
Power Down
DC bus good
Output good
P
N
M
PCB heatingLamps
Vo+
Vo–
CQ
1001-6R
06086
Fig. 46
Front end with various loads (example)
Cassette Style AC-DC Converters T Series
Edition 5/5.2000 25/33
Electromagnetic Emission
The conducted noise emitted at the input of the T units
within the frequency range of 10 kHz to 30 MHz is below
level B according to CISPR 11/22/EN 55011/22 under all
operating conditions.
The radiated noise in the frequency range of 30 MHz to
300 MHz on the input- and the output-side of the T units
stays below the limit of CISPR 14/EN 55014 measured
90
80
70
60
50
40
30
20
10
0
0
.01
0
.05
0.1
0.5
1
2
5
10
20
30
[dBµV]
MHz
0
.02
07035
A
B
Fig. 47
Typical disturbance voltage (quasi-peak) at the input of a
T series AC-DC converter according to CISPR 11/22 and
EN 55011/22, measured at U
i nom
and I
o nom
.
Fig. 48
Typical radiated electromagnetic field strength (quasi peak)
of an LT 1740 according to CISPR 11/22/EN 55011/22, nor-
malized to a distance of 10 m, measured on an open area
test site at U
i nom
and I
o nom
.
50
40
30
20
10
0
30
50
100
200
500
1000
[dBµV/m]
[MHz]
A
B
07039
with an MDS-clamp and below level A, according to
CISPR 11/22/EN 55011/22 measured with an antenna.
The radiated noise of the T units between 30 MHz and
1 GHz will be reduced if the unit is built into a conductive
chromatized 19" rack, fitted with a front panel. For units
mounted otherwise, e.g. for wall mounting with option B1
(base plate) the radiated noise may be above level A.
which typically occur in most installations, but especially in
battery driven mobile applications. The T series has been
successfully tested to the following specifications:
Electromagnetic Compatibility (EMC)
A suppressor diode or a metal oxide VDR (depending upon
the type) together with an input fuse and an input filter form
an effective protection against high input transient voltages
Electromagnetic Immunity
Table 17: Immunity type tests
Phenomenon Standard 4 Level Coupling Value Waveform Source Test In Per-
mode 2 applied imped. procedure oper. form.
Electrostatic IEC/EN 4 contact discharge 8000 Vp1/50 ns 330 Ω10 positive and yes 1
discharge 61000-4-2 air discharge 15000 Vp10 negative
(to case) discharges
Electromagnetic IEC/EN 3 antenna 10 V/m AM 80% n.a. 26…1000 MHz yes 1
field 61000-4-3 1 kHz
Electrical fast IEC/EN 4 capacitive, o/c 2000 Vpbursts of 5/50 ns 50 Ω1 min positive yes 1
transient/burst 61000-4-4 4 direct, 4000 Vp2.5/5 kHz over 1 min negative
i/c, +i/–i15 ms; burst transient per
period: 300 ms coupling mode
Surge IEC/EN 3 i/c 2000 Vp1.2/50 µs 12 Ω5 pos. and 5 neg. yes 1
61000-4-5 4 +i/–i2 Ωsurges per coupling
mode
VDE 0160 II +i/–i 2.3 •
U
ip 0.1/1.3 ms 1700 J 3 pos. and 3 neg. yes 3
max impulses
6 repetition
Conducted IEC/EN 3 i, o, signal wires 10 Vrms AM 80% 150 Ω0.15...80 MHz yes 1
disturbances 61000-4-6 (140 dBµV) 1 kHz
1Normal operation, no deviation from specifications
2i = input, o = output, c = case.
3Normal operation, short deviation from specs. possible
4 Related and previous standards are referenced in:
Technical Information: Standards
Cassette Style AC-DC Converters T Series
Edition 5/5.2000 26/33
Table 19: Temperature specifications
Temperature –7
Characteristic Conditions min typ max Unit
T
AAmbient operational
I
o = 0...
I
o nom –25 71 °C
temperature range
I
o >
I
o nom –25 65
Temperature range limited by
U
cr range
for battery charging
T
CCase operational
I
o = 0...
I
o nom –25 95
temperature range
I
o >
I
o nom –25 90
at measurement point
(see:
Mechanical Data
)
T
SStorage temperature –40 100
range (not operating)
T
Cs Shut down 100
case temperature
R
th CA Thermal resistance convection 0.5 K/W
case to ambient cooling
τ
CThermal time constant 1 h
of case
Table 20: MTBF
Values at specified Module types Ground benign Ground fixed Ground mobile Unit
case temperature 40°C40°C70°C50°C
MTBF 1 LT 1701-7 198'000 56'000 26'000 20'000 h
Device hours 2 810'000
1Calculated in accordance with MIL-HDBK-217E (calculation according to edition F would show even better results)
2Statistical values, based on an average of 4300 working hours per year and in general field use, over 3 years
Immunity to Environmental Conditions
Table 18: Mechanical stress
Test method Standard Test conditions Status
Ca Damp heat IEC/DIN IEC 60068-2-3 Temperature: 40 ±2 °C Unit not
steady state Relative humidity: 93 +2/-3 % operating
Duration: 56 days
Ea Shock IEC/EN/DIN EN 60068-2-27 Acceleration amplitude: 100 gn = 981 m/s2Unit
(half-sinusoidal) Bump duration: 6 ms operating
Number of bumps: 18 (3 each direction)
Eb Bump IEC/EN/DIN EN 60068-2-29 Acceleration amplitude: 40 gn = 392 m/s2Unit
(half-sinusoidal) Bump duration: 6 ms operating
Number of bumps: 6000 (1000 each direction)
Fc Vibration IEC/EN/DIN EN 60068-2-6 Acceleration amplitude: 0.21 mm (10...60 Hz) Unit
(sinusoidal) 3 gn = 29.4 m/s2 (60...2000 Hz) operating
Frequency (1 Oct/min): 10...2000 Hz
Test duration: 7.5 h (2.5 h each axis)
Fda Random vibration IEC 60068-2-35 Acceleration spectral density: 0.05 gn rms Unit
wide band DIN 40046 part 23 Frequency band: 20...500 Hz operating
Reproducibility Acceleration magnitude: 4.9 gn rms
high Test duration: 3 h (1 h each axis)
Kb Salt mist, cyclic IEC/EN/DIN IEC 60068-2-52 Concentration: 5% (30°C) Unit not
(sodium chloride Duration: 2 h per cycle operating
NaCl solution) Storage: 40°C, 93% rel. humidity
Storage duration: 22 h per cycle
Number of cycles: 3
Cassette Style AC-DC Converters T Series
Edition 5/5.2000 27/33
0 100 200 300 400 500 600Po [W]
45
40
35
30
25
20
15
10
5
0
Ploss [W]
Ui = 110 Vrms Ui = 230 Vrms
Output current limitation
Output voltage regulation
Output power limitation
08003
–25 50 60 70 80 90 100
T
A
[°C]0
550
290
P
o
[W]
P
o max
(forced cooling)
P
o max
(convection
cooling)
Output power/current
limitation mode
(I
o
>10 A)
Output voltage
regulation mode
(I
o
<10 A)
95
08002
Fig. 49
Output power versus ambient temperature of T 17xx
Fig. 50
Internal power losses versus nominal output power of
T 17xx
Environmental Conditions
Thermal Considerations
Despite the fact that the T series have a very high efficiency
the operating losses of the unit will heat the case. The heat
sinks are designed to dissipate the power losses at maxi-
mum output power over the specified temperature range
without forced cooling if the convection cooling provides
sufficient air volume, without obstructions for vertical air ex-
change below and above the units.
Because of the slightly higher power losses in output power
and current limitation mode the maximum admissible am-
bient and case temperature is then lower than in output
voltage regulation mode.
The T series have a built-in overtemperature shut down to
protect the internal circuitry.
Derating is required for applications with higher operational
ambient temperature. Fig.:
Output power vs. ambient tem-
perature
shows the derating of the output power versus op-
erational temperature above the specified ambient tem-
perature of 71°C of an LT 17xx unit. Two different condi-
tions are shown:
a) Unit operating with convection cooling (solid line).
For example if the operational ambient temperature
reaches 80°C, the maximum output power should be lim-
ited to approx. 290 W. In this case steady operation in
output power or current limitation mode is not possible.
b) Unit operating with forced cooling (dotted line).
Under these conditions, the case temperature of the T
unit is decisive. With sufficient cooling provided (air
flow!), the unit still delivers 550 Watts output power in
voltage regulation mode even at 85°C ambient tempera-
ture, provided that the maximum case temperature of
95°C is not exceeded (Measuring point
of case tempe-
rtature T
C, see:
Mechanical Data
). If the case tempera-
ture does not exceed 90°C, steady operation in output
power or current limitation mode is still possible. Never-
theless it is not recommended to operate the units con-
tinuously close to the maximum case temperature since
life time will be reduced.
Since the operating temperature of a power supply is of
major importance to reliability the following conditions
should be considered:
1. Do not cover heat sinks.
2. Do not obstruct air flow around the heat sinks.
3. Maximize free space around the units.
4. In a system where the power supplies as well as the
loads are located in the same enclosure, forced cool-
ing is recommended. The T units should be placed in
the lower section of the enclosure.
5. In a closed system heat may build up causing exces-
sive temperatures.
6. Always check the maximum ambient and case tem-
perature after system integration.
Cassette Style AC-DC Converters T Series
Edition 5/5.2000 28/33
Mechanical Data
Dimensions in mm. Tolerances ±0.3 mm unless otherwise indicated.
European
Projection
3U/111
94.8
Fixtures for retention clips
"V" for female connector
168.5
171.93 (DIN 41494)
8
1
/
2
TE
3U/111
94.8
28 TE /142.2
5
1
/
2
TE
30
1
1.5
26.8
28 TE/141.5
0.73
0.3
Trim-potentiometer (T xx40)
Cell voltage selector switch Z (T xx40)
Case temperature measuring point 1
System (ok) (green)
U
o (ok) (green)
Testsockets
Error LED (red)
09036
Measuring point 2
of case temperature
T
c
Input fuse (Option)
60
Measuring point 1
of case temperature
T
c
Fig. 51
Case T01, weight 3.0 kg
Cassette Style AC-DC Converters T Series
Edition 5/5.2000 29/33
111
101 5
133.4
17.3
168.5
158
5
119 8
5
12.35
12
171.93 (DIN 41494)
ø 4.5
M4
Measuring point of case temperature T
c
Front
panel
28.3
09037
Fig. 52
Case T01 with option B1 (cooling plate)
Fig. 53
Temperature sensor with mounting fixture.
≤60
12
l
l: 2 m standard length
other cable lengths on request
25
± 0.2
adhesive tape
15
14.5
09044
Cassette Style AC-DC Converters T Series
Edition 5/5.2000 30/33
Table 21: H15 Connector pin allocation
Pin Electrical determination Designation
4 Phase P~
6 Neutral N~
8 Protective earth 1
10 Protective earth 1
12 Output voltage positive Vo+
14 Output voltage positive Vo+
16 Hot plug-in contact 1 3 positive HC+
18 Hot plug-in contact 1 3 negative HC–
20 Output voltage negative Vo-
22 Output voltage negative Vo-
24 System good signal input Sys In
26 System good signal output Sys Out
28 Inhibit input 2 or Remote control input i/
U
cr
30 Power down signal D
32 Power down signal threshold of
U
oD set
1 Leading pin (pre-connecting).
2 Unit operates with open inhibit.
3 External connections see:
Auxiliary Functions: Power Boosting,
Redundant Configuration, Hot Plug-in.
Safety and Installation Instructions
Connector Pin Allocation
The connector pin allocation table defines the electrical
potentials and the physical pin positions on the H15 con-
nector. Pin no. 8 and pin no. 10, the protective earth pins
present on all T series AC-DC converters are leading, en-
suring that they make contact with the female connector
first.
Fig. 54
View of module’s male H15 connector
Installation Instruction
The T series AC-DC converters are components, intended
exclusively for inclusion within other equipment by an in-
dustrial assembly operation or by professional installers. In-
stallation must strictly follow the national safety regulations
in compliance with the enclosure, mounting, creepage,
clearance, casualty, markings and segregation require-
ments of the end-use application. See also:
Technical Infor-
mation: Installation and Application.
Connection to the system shall be made via the female con-
nector H15 (see:
Accessories
) according to:
Connector pin
allocation.
Other installation methods may not meet the
safety requirements.
Check for hazardous voltages before altering any connec-
tions.
The AC-DC converters are provided with pins 8 and 10
(), which are reliably connected to the case. For safety
reasons it is essential to connect at least one of these pins
to the protective earth of the supply system.
The P~ input (pin no. 4) is internally fused. This fuse is de-
signed to protect the unit in case of overcurrent and may
not be able to satisfy all customer requirements. External
fuses in the wiring to one or both input pins (no. 4 and/or no.
6) may therefore be necessary to ensure compliance with
local requirements. A second fuse in the wiring to the neu-
tral terminal N~ is needed if:
•Local requirements demand an individual fuse in each
source line
•Neutral to earth impedance is high or undefined
•Phase and neutral of the mains are not defined or cannot
be assigned to the corresponding terminals (L to phase
and N to neutral).
Important: Do not open the modules, or guarantee will
be invalidated.
Caution: Prior to handling, the AC-DC converter must
be disconnected from mains and from other sources
(e.g. batteries). Check for hazardous voltages and haz-
ardous energy before and after altering any connec-
tions. Hazardous energy levels may be present at the
output terminals for 3 minutes even after the mains input
voltage has been disconnected from the unit. This is in-
dicated by the red error LED. It is the responsibility of the
installer to prevent an unwanted short-circuit of the AC-
DC converter and of the batteries. To prevent an un-
wanted short-circuit across the output of a disconnected
unit, pins 16 and 18 are leading. In case of a short-circuit
across the output of a T-unit, all LEDs will be off, though
the mains may be present.
Due to high output current value, the T series AC-DC con-
verters provide for each the positive and the negative out-
put path two internally parallel connected contacts (pins 12/
14 and pins 20/22 respectively). It is recommended to con-
nect the load to both female connector pins of each path in
order to keep the voltage drop and power loss across the
connector pins to an absolute minimum.
If a T series AC-DC converter is used for battery charging,
check wether the position of the cell voltage selector switch
corresponds to the required battery cell voltage prior to
putting a system into operation.
Caution: Lead-acid batteries can generate H2 and O2
gas which can form explosive mixtures. Sufficient venti-
lation must be provided in battery cabinets and installa-
tion rooms.
4
68
12
10
14 16
18 20
22 24
26 28
30 32
10079
Cassette Style AC-DC Converters T Series
Edition 5/5.2000 31/33
Further information about designing battery systems is con-
tained in VDE 0510, part 2.
If a T unit is to be parallel connected with another T unit, it is
recommended to connect the two hot plug-in pins of each
female connector, HC+ (pin 16) and HC– (pin 18) to their
respective output pins Vo+ and Vo- to provide the hot plug-
in capabilities.
In case of remote temperature control, the temperature
sensor should be connected according to its wiring dia-
gram. Wrong connection may damage the sensor.
Make sure that there is sufficient air flow available for con-
vection cooling. This should be verified by measuring the
case temperature when the unit is installed and operated in
the end-use application. The maximum specified case tem-
perature
T
C max must not be exceeded
.
See also:
Thermal
Considerations.
If the end-product is to be UL certified, the temperature test
may be repeated asv part of the end-product investigation.
Ensure that a unit failure (e.g. by an internal short-circuit)
does not result in a hazardous condition. See also:
Safety
of operator accessible output circuit.
Cleaning Agents
In order to avoid possible damage, any penetration of
cleaning fluids is to be prevented, since the power supplies
are not hermetically sealed.
Audible Noise
Under certain operating conditions, a T series AC-DC con-
verter may generate a slight audible noise due to magneto-
striction in the transformer. This noise does neither affect
the function of the unit nor is it detrimental to its perform-
ance over time.
Standards and approvals
All T series AC-DC converters correspond to class I equip-
ment. They are UL recognized according to UL 1950, UL
recognized for Canada to CAN/CSA C22.2 No. 950-95 and
LGA approved to IEC/EN 60950 standards and have been
evaluated in accordance with these standards for:
•Building in
•Basic insulation between input and case, based on
250 V AC
•Double or reinforced insulation between input and out-
put, based on 250 V AC
•Operational insulation between output and case
•The use in a pollution degree 2 environment
•Connecting the input to a primary circuit with a maxi-
mum transient rating of 2500 V (overvoltage class III
based on a 110 V primary circuit, overvoltage class II
based on a 230 V primary circuit).
The AC-DC converters are subject to manufacturing sur-
veillance in accordance with the above mentioned UL,
CSA, EN and with ISO 9001 standards.
Isolation
The electric strength test is performed as factory test in ac-
cordance with IEC/EN 60950 and UL 1950 and should not
be repeated in the field. Power-One will not honour any
guarantee claims resulting from electric strength field tests.
Important: Testing by applying AC voltages will result in
high and dangerous leakage currents flowing through
the Y-capacitors (see fig.:
Block diagram
).
Table 22: Isolation
Characteristic LT/UT AC-DC converter Sensor Unit
Input to Input to Output to Output to
case output case case
Electric Required according to IEC/EN 60950 1.5 3.0 1 0.5 0.5 kVrms
strength 2.1 4.2 1 0.7 0.7 kV DC
test voltage Actual factory test 1 s 2.8 5.6 1 1.4 1.4
AC test voltage equivalent to actual 2.0 4.0 1 1.0 1.0 kVrms
factory test
Insulation resistance at 500 V DC >300 >300 >300 >100 MΩ
1In accordance with IEC/EN 60950 only subassemblies are tested in factory with this voltage.
V
MI
500 Ω
1500 Ω
10 kΩ220 nF
22 nF
10061
Fig. 55
Measuring instrument (MI) for earth leakage current tests
according to IEC/EN 60950, Annex D.
Leakage Currents in AC-DC operation
Leakage currents flow due to internal leakage capacitance
and RFI suppression Y-capacitors. The current values are
proportional to the mains voltage and nearly proportional to
the mains frequency. They are specified at maximum oper-
ating input voltage where phase, neutral and protective
earth are correctly connected as required for class I equip-
ment.
Under test conditions, the leakage current flows through a
measuring instrument (MI) as described in fig.:
Measuring
instrument for earth leakage current tests
, which takes into
account impedance and sensitivity of a person touching
unearthed accessible parts. The current value is calculated
by dividing the measured voltage by 500 Ω. If inputs and/or
outputs of T units are connected in parallel, their individual
leakage currents are added.
Cassette Style AC-DC Converters T Series
Edition 5/5.2000 32/33
Table 24: Safety concept leading to an SELV circuit
Conditions AC-DC converter Installation Result
Supply voltage Grade of isolation between input and Measures to achieve the resulting Safety status of the AC-DC
output, provided by the AC-DC safety status of the output circuit converter ouput circuit
converter
Mains ≤250 V AC Double or reinforced Installation according to the appliable SELV circuit
standards
Fig. 58
Schematic safety concept
Use input fuses and earthing of the AC-DC converter as
per:
Installation Instructions
.
AC-DC
con-
verter
Mains SELV
Earth connection
+
–
10021
Fuse
Fuse
P
N
P~
N~
Vo+
Vo–
MI for
output
leakage
current
Vo+
Vo–
N
P
10070
N
P
MI for
earth
leakage
current
S1
S2
S3
T 1000
Fig. 56
Test set-up for leakage current tests on class I equipment
in single phase configuration. S1 is used to simulate the
interchanging of phase and neutral, S2/3 select either the
earth or output leakage current measurements, S4 selects
either the positive or negative output leakage current
measurements.
MI for
output
leakage
current
Vo+
Vo–
L1
10071
N
P
MI for
earth
leakage
current
S2
S3
L2
L2
N
L1
L2
LT 1000
Fig. 57
Test set-up for leakage current tests on class I equipment
in 208 V phase to phase configuration. S2/3 select either
the earth or output leakage current measurements, S4
selects either the positive or negative output leakage cur-
rent measurements.
Table 23: Leakage currents
Characteristic T 1000 Unit
Earth leakage Permissible according to IEC/EN 60950 3.5 mA
current Specified value at 255 V, 50 Hz (LT) 1.8 1
Specified value at 127 V, 60 Hz (LT or UT) 1.1 1
Output leakage Permissible according to IEC/EN 60950 0.25
current Specified value at 255 V, 50 Hz (LT) <0.1
Specified value at 127 V, 60 Hz (LT or UT) <0.1
1In phase to phase configuration, leakage current is lower.
Safety of operator accessible output circuit
If the output circuit of an AC-DC converter is operator ac-
cessible, it shall be an SELV circuit according to IEC/EN
60950 related safety standards
The following table shows a possible installation configura-
tion, compliance with which causes the output circuit of the
AC-DC converter to be an SELV circuit according to IEC/
EN 60950 up to a configured output voltage (sum of nomi-
nal voltages if in series or +/– configuration) of 56.5 V.
However, it is the sole responsibility of the installer to as-
sure the compliance with the relevant and applicable safety
regulations. More information is given in:
Technical Infor-
mation:
Safety
.
Protection Degree
IP 30 if female connector is fitted to the unit.
Cassette Style AC-DC Converters T Series
Edition 5/5.2000 33/33
Description of Options
D Remote Bus Voltage Monitoring
This option is designed for systems using backplanes or is
inteded for use in applications where a fuse or a decoupling
diode is fitted into the positive supply line to the system bus.
The status of the system bus/battery voltage can be moni-
tored rather than the output status of a single T unit. To
maintain the adjustment capabilities and resistor values for
setting the different threshold values a 43.2 kΩ (21.5 kΩ)
resistor should be fitted into the sense line to the bus. If the
D set pin is left open the T unit signals permanently Low
Bus Voltage.
(See also:
Power Down
as well as data sheet:
Back Planes
for the T Series
)
F Externally Accessible Fuse
The standard T units have internally a 5 × 20 mm fuse
which is externally not accessible. Some applications re-
quire an externally accessible fuse. Option F provides a
fuse mounted on the back plate neer the converter. The full
self-protecting functions of the module do normally not lead
to broken fuses, except as a result of overvoltage at the in-
put or if a power component inside fails (switching transis-
tor, freewheeling diode, etc.). In such cases the defective
unit has to be returned to Power-One for repair.
B1 Cooling Plate
If a cooling surface is available the T 1000 units can be pro-
vided with a mounting plate (option B1) instead of the
standard heat sink fitted to the right hand side of the unit.
Since approximately 50% of the losses have to be dissi-
pated through the heat sink on the left hand side sufficient
free air flow has still to be provided.
Accessories
A variety of electrical and mechanical accessories are
available, including:
–Front panels for 19" rack mounting, Schroff system
–Mating H15 connectors with screw, solder, fast-on or
pressfit terminals
–Connector retention facilities
–Code key system for connector coding
–19" racks for system integration
–Back planes for system integration
–Temperature sensors for battery charging
For more detailed information refer to:
Accessory Products.
Back planes for system intergration
19" Rack
H15 female connector
Code system
Front panels
