071003/10 www.lem.com
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
page 1/3
Current Transducer LF 505-S
For the electronic measurement of currents: DC, AC, pulsed...,
with a galvanic isolation between the primary circuit (high power)
and the secondary circuit (electronic circuit).
Electrical data
IPN Primary nominal current rms 500 A
IPM Primary current, measuring range 0 .. ± 800 A
R M Measuring resistance RM mini RM maxi
with ± 15 V @ ± 500 A maxi 060 Ω
@ ± 800 A maxi 011 Ω
with ± 18 V @ ± 500 A maxi 092 Ω
@ ± 800 A maxi 030 Ω
with ± 24 V @ ± 500 A maxi 5149 Ω
@ ± 800 A maxi 565 Ω
ISN Secondary nominal current rms 100 mA
K N Conversion ratio 1 : 5000
VCSupply voltage (± 5 %) ± 15 .. 24 V
ICCurrent consumption (± 1 mA) 24 (@ ± 18 V) + ISmA
Accuracy - Dynamic performance data
XAccuracy @ IPN , TA = 25°C ± 0.6 %
εLLinearity error < 0.1 %
Typ Maxi
IOOffset current @ IP = 0, TA = 25°C ± 0.4 mA
IOM Magnetic offset current @ IP = 0 and specified RM,
after an overload of 3 x IPN ± 0.2 mA
IOT Temperature variation of IO- 40°C .. + 70°C ± 0.1 ± 0.4 mA
trResponse time 1) to 90 % of IPN step < 1 µs
di/dt di/dt accurately followed > 100 A/µs
BW Frequency bandwidth (- 1 dB) DC .. 100 kHz
General data
TAAmbient operating temperature - 40 .. + 70 °C
TSAmbient storage temperature - 40 .. + 85 °C
R S Secondary coil resistance @ TA = 70°C 70 Ω
mMass 230 g
Standards EN 50155: 1995
EN 50178: 1997
Note:1) With a di/dt of 100 A/µs.
Features
•Closed loop (compensated) current
transducer using the Hall effect
•Isolated plastic case recognized
according to UL 94-V0.
Advantages
•Excellent accuracy
•Very good linearity
•Low temperature drift
•Optimized response time
•Wide frequency bandwidth
•No insertion losses
•High immunity to external
interference
•Current overload capability.
Applications
•AC variable speed drives and servo
motor drives
•Static converters for DC motor drives
•Battery supplied applications
•Uninterruptible Power Supplies (UPS)
•Switched Mode Power Supplies
(SMPS)
•Power supplies for welding
applications.
IPN =500 A
Applications domain
•Traction
•Industrial.
16137
071003/10
page 2/3
www.lem.com
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
Current Transducer LF 505-S
Isolation characteristics
VdRms voltage for AC isolation test, 50 Hz, 1 min 3.8 kV
VwImpulse withstand voltage 1.2/50 µs 12.5 kV
Mini
dCp Creepage distance 15.2 mm
dCl Clearance distance 14.5 mm
CTI Comparative Tracking Index (Group IIIa)175
Application examples
According to EN 50178 and CEI 61010-1 standards and following conditions:
•Over voltage category OV 3
•Pollution degree PD2
•Non-uniform field
Safety
This transducer must be used in electric/electronic equipment with respect to
applicable standards and safety requirements in accordance with the manufacturer's
operating instructions.
Caution, risk of electrical shock
When operating the transducer, certain parts of the module can carry hazardous
voltage (eg. primary busbar, power supply).
Ignoring this warning can lead to injury and/or cause serious damage.
This transducer is a built-in device, whose conducting parts must be inaccessible
after installation.
A protective housing or additional shield could be used.
Main supply must be able to be disconnected.
EN 50178 CEI 61010-1
dCp, dCI, Rated isolation voltage Nominal voltage
Single isolation 1250 V 1250 V rms
Reinforced isolation 690 V 690 V rms
VW
071003/10 www.lem.com
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
page 3/3
Mechanical characteristics
•General tolerance ± 0.5 mm
•Transducer fastening
Vertical or flat lying position 4 or 6 holes ∅ 4.3 mm
4 or 6 steel screws M4
Recommended fastening torque 3.2 Nm or 2.37 Lb.-Ft.
or vertical position 4 holes ∅ 1.9 mm,
depth : 7.5 mm
4 screws PTKA 25,
length: 6 mm
Recommended fastening torque 0.7 Nm or 0.52 Lb.-Ft.
or flat lying position 4 holes ∅ 1.9 mm, crossing
4 screws PTKA 25,
length:10 mm
Recommended fastening torque 0.75 Nm or 0.55 Lb.-Ft.
•Primary through-hole ∅ 30.2 mm
•Connection of secondary MOLEX 6410
3 Tin plated pins
Dimensions LF 505-S (in mm. 1 mm = 0.0394 inch)
Top view
Right view
Remarks
•IS is positive when IP flows in the direction of the arrow.
•Temperature of the primary conductor should not exceed
100°C.
•Dynamic performances (di/dt and response time) are best
with a single bar completely filling the primary hole.
•This is a standard model. For different versions (supply
voltages, turns ratios, unidirectional measurements...), please
contact us.
Bottom view
Back view
Connection
