Power Supplies PS3E Series
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L
Instructions
Notes for Safety
For the use of switching power supplies, observe the following notes.
Installation Instructions
• Notes for Installation
1. PS3E switching power supplies can be
installed in either (A) or (B) direction shown
below. For PS3E-E/-F types, output current vs
operating temperature.
2. Mount the switching power supply on a metal-
lic surface that provides adequate heat dissipa-
tion. Be sure to prevent heat built-up around the
power supplies.
3. Maintain 20mm clearance between the power
supplies.
4. Use mounting
screws of a proper
length so that screws
do not penetrate
more than 6mm into
the housing of
switching power
supply.
• Adjustment of Output Voltage
The output voltage can be adjusted within ± 10%
of the rated output voltage by using the V. ADJ
control on the front.
Turning the V.ADJ clockwise increases the output
voltage. When using a higher output voltage,
reduce the output current to make sure that the
output capacity is within the rating. Note that
overvoltage protection may work when increasing
the output voltage.
• Overcurrent Protection
The output voltage drops automatically when an
overcurrent flows due to an overload or short cir-
cuit. Normal voltage is automatically restored
when the load returns to normal conditions.
• Overvoltage Protection
PS3E-A
PS3E-A uses a zener diode for overvoltage pro-
tection. If the output voltage is reduced by over-
voltage (120% or more), replace the zener diode
to restore the output voltage.
PS3E-B/C/D/E/F
The output is turned off by overvoltage protection
when an overvoltage is generated . When an out-
put voltage is reduced by overvoltage (130% or
more), turn the input off and after one minute,
turn the input on again.
• Input Surge Current
PS3E-A/B/C/D uses a power thermistor in inrush
control circiut. Since the limit control varies with
the temperature, surge current is increased at
high temperatures. Note your selection of
switches and fuses.
• Series Operation
The following series operation is allowed
For the series operation shown in
figure (b), insert a Schottky diode.
• Notes for Operation
1. Welded fuses indicate that the internal circuits
are damaged. If welded fuses are found in the
internal circuits, contact IDEC for repair.
2. Avoid overload or short-circuit for a long period
of time or you may damage the internal compo-
nents.
3.Not sutiable for parallel operation.
(A) (B)
20mm or more
(a) +
IN OUT
_
+
_
+
IN
_
OUT
_
+
LOAD
LOAD
(b) +
IN
_
+
IN
_
OUT
_
+
OUT
_
+
LOAD
D
D
!
• Do not use switching power supplies
with electric equipment whose malfunc-
tion or inadvertent operation may damage
the human body or life directlty.
• Voltage and output current should not
exceed the ratings. If voltage and output
current exceed the ratings, electric
shock, fire, or malfunction may occur.
• Do not touch the switching power sup-
plies when input voltage is applied, or
electric shock may occur.
• Ensure protection against malfunction or
damage caused by the malfunction of
switching power supplies into the final
product.
• Operating temperatures should not
exceed the ratings. Be sure to note the
derating characteristics. If the operating
temeperature exceeds the ratings, elec-
tric shock, fire, or malfunction may occur.
• Welded fuses indicate that the internal
circuits are damaged. If the welded fuses
are found in the internal circuits, contact
IDEC for repair.
• Do not use the switching power supplies
for recharging batteries.