When power supplies do not function properly, please check the following troubleshooting table before returning a unit. If the power supply still has a problem, please contact the designated distributors or our customer service desk for information (a Return Merchandise Authorization (RMA) number in U.S.) about how to return the power supply to us.
No.
|
Possible Causes
|
Check Points
|
Solutions
|
Applicable
Products
|
1
|
I
n
p
u
t
S
i
d
e
|
Wrong AC voltage is applied.
|
In case of dual input voltage power supply (AC85-132V and AC170-264V). Check to see if the power supply needs jumper selector for AC input and use it properly.
|
Make sure to use the jumper for the following models in case of AC85-132V input.
|
P50E, P100E, P150E,
PMC50E-PMC100E,
P1500E,
AD240, AD480
|
2
|
AC voltage is not applied to power supply correctly.
|
Wrong input connection?
For example, AC(L) or (N) is connected to FG terminal.
|
Check and correct the input connection if necessary.
|
All Series
|
3
|
Is external fuse blown?
|
1)If the built-in fuse is blown, return the power supply to us for repair.
2)If the built-in fuse has no problem, change the external fuse to one that can withstand the inrush current of the power supply and has the same voltage/current rating as the built-in fuse.
|
4
|
O
u
t
p
u
t
S
i
d
e
|
1)Wrong connection.
2)Loosened terminal screws.
|
Is the wiring to the load correct? (For example, +V and -V are connected reversed).
|
Correct the connection.
|
5
|
Check to see if the wiring to the load shorted together accidentally.
|
Correct the problem by checking the wiring isolation.
|
6
|
Terminal screws have loosened?
|
Tighten the terminal screws.
|
7
|
Over voltage protection has been operated.
|
Is output voltage adjuster (trim pot) excessively turned clockwise?
|
Switch off the power supply, turn output voltage adjuster to its maximum counterclockwise, and wait for 5 minutes before switching on the power supply again.
|
All Series
|
8
|
Sensing terminal screws have loosened?
|
Tighten the screws.
|
R100U, R150U,
P100E-
P(T)1500,
UAW, UAF,
PAA100F-PAA600F
LDA300
|
9
|
Is sensing wiring correct?
|
Connect the sensing wires according to the instruction manual.
|
10
|
Are sensing wires disconnected?
|
Re-connected.
|
11
|
Over current protection has been operated.
|
Are there any chances that the drawing current has become greater than the rated output current?
|
Check the rated output current of the power supply used and measure the current actually drawn from power supply.
|
All Series
|
12
|
Remote ON/OFF is off.
|
In case of AC/DC power supply: Is RC terminal connected to RCG terminal?
|
Connect (short circuit) RC terminal to RCG terminal.
|
P300E, P600E,
P(T)1500,
PAA300F, PAA600F
|
13
|
In case of DC/DC power supply: Is RC terminal connected to -V input?
|
Connect (short circuit) RC terminal to -V input.
|
ZUS, ZUW,
DAS
|
14
|
Power supplies used in series operation.
|
Are the power supplies used allowed series operation?
|
Change the power supplies to those allowed series operation.
|
Refer to instruction
manuals.
|
15
|
O
t
h
e
r
s
|
Thermal protection has been operated.
|
Is the ambient temperature higher than the specified maximum operating temperature?
|
Switch off the power supply and cool it down under at room temperature before switching on again.
|
P(T)1500, AD960
DPA, DAS, DBS,
UAW250, 500,
UAF500, LDA300,
PAA300F, PAA600F
|
16
|
Are there any obstacles around the power supply that are physically stopping the built-in cooling fan or the air flow?
|
Remove the obstacles, switch off the power supply, and cool it down under at room temperature before switching on again.
|
P(T)1500,
UAW250,500,
UAF500, LDA300,
PAA300F, PAA600F
|
17
|
There is a condensing on power supply.
|
Is there water splash on power supply?
|
Keep power supply away from water splash!!
|
All Series
|
18
|
Are there any sudden changes in ambient temperature?
|
Use power supply where ambient temperature is stable.
|
No.
|
Possible Causes
|
Check Points
|
Solutions
|
Applicable
Products
|
1
|
W
h
e
n
o
u
t
p
u
t
v
o
l
t
a
g
e
i
s
t
o
o
h
i
g
h
.
|
Output voltage is set too high.
|
Is output voltage adjuster (trim pot) turned excessively clockwise?
|
Turn output voltage adjuster counterclockwise.
|
All Series
|
2
|
Is there any external voltage from another source applied to the same load?
|
Change the load circuit so that there will be no external voltage applied through the load to the power supply.
|
All Series
|
3
|
Have the sensing terminal screw loosened?
|
Tighten the screws.
|
R100U, R150U,
P100E-
P(T)1500,
UAW, UAF,
LDA300,
PAA100F-PAA600F
|
4
|
W
h
e
n
o
u
t
p
u
t
v
o
l
t
a
g
e
i
s
t
o
o
l
o
w
.
|
Input voltage is too low.
|
Is input voltage lower than the minimum specified?
|
Measure the input voltage.
|
All Series
|
5
|
Is wave form of input voltage distorted?
|
If distorted, use AVR for input.
|
6
|
Output voltage is set too low.
|
Is output voltage adjuster (trim pot) turned excessively counterclockwise?
|
Turn output voltage adjuster clockwise.
|
7
|
There is a voltage drop caused by output wires.
|
Is voltage drop caused by long output wires to the load?
|
Make the output wires shorter.
|
8
|
Is voltage drop caused by thin (high-AWG) output wires to the load?
|
Use thicker (low-AWG) wires.
|
9
|
Is there any bad connection?
|
Check the connection.
|
10
|
Have the terminal screws loosened?
|
Tighten the screws.
|
11
|
Over current protection has been operated.
|
Are there any chances that the drawing current has become greater than the rated output current?
|
Check the rated output current of the power supply used and measure the current actually drawn from power supply.
|
12
|
W
h
e
n
o
u
t
p
u
t
v
o
l
t
a
g
e
i
s
u
n
s
t
a
b
l
e
.
|
There is oscillation caused by remote sensing.
|
Are the sensing wires too long?
|
Use electrolytic capacitor between output terminal (+V, +M) and sensing terminal (+S).
|
R100U, R150U,
P100E-
P(T)1500,
UAW, UAF,
LDA300,
PAA100F-PAA600F
|
13
|
Are the sensing wires twisted?
|
Twist the wires.
|
14
|
Minimum output current required is not drawn.
|
In case of some Multiple output type power supply, a minimum drawing current is required on +5V output.
Check to see if there is minimum load requirement for the power supply.
|
1)Draw a minimum current required on +5V.
2)Use a power supply whose +5V output has no minimum drawing current requirement.
|
1)PMC, MMC
2)MMB, LEB,
RMB, RMC,
LDC
|
