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� Probable Causes of Power Supply Errors and Troubleshooting Using
Undervoltage Alarm Function
Check the following information if the Undervoltage Alarm Function operates.
Contact your OMRON representative if the Power Supply does not function normally after checking.
The symbols in the table are as follows:
: Lit,
: Not lit,
: Flashing
Note: Flashing: The output voltage is unstable, causing the LED to repeatedly turn ON and OFF.
DC ON
DC LOW1
Transistor
LED D:
LED F:
outputs
Green
Yellow
(H to J)
1
ON
2
OFF
3
ON
4
OFF
5
OFF
6
ON
7
OFF
ON
8
OFF
14
10
Switch Mode Power Supply
DC LOW2
Transistor
Output voltage
LED G:
outputs
Red
(I to J)
Normal
(approx. 90% min.
→
ON
of rated output
voltage)
Normal
(approx. 90% min.
→
ON
of rated output
voltage)
Output drop
(approx. 90%
→
OFF
max. of rated
output voltage)
Output drop
(approx. 90%
→
OFF
max. of rated
output voltage)
Output drop
ON
(approx. 80% of
→
rated output
OFF
voltage)
Output drop
ON
(approx. 80% of
→
rated output
OFF
voltage)
→ No output
OFF
ON
→ Unstable output
OFF
S8VM
Power Supply status diagnosis
Normal status
The output voltage has re-
covered to normal status
following a previous sud-
den voltage drop.
The output voltage has
dropped gradually and re-
mains low.
The output voltage re-
24 V
mains low following a pre-
vious sudden voltage
drop.
The output voltage re-
mains low and is continu-
ing to fluctuate following a
previous sudden voltage
drop.
The output voltage has
dropped gradually, re-
mains low, and is continu-
ing to fluctuate.
No output voltage is being
output.
The output voltage is un-
stable.
Switch Mode Power Supply S8VM
24 V
24 V
24 V
24 V
24 V
24 V
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