Chapter 8 Troubleshooting
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Chapter 8: Troubleshooting
When you see the following problems appear on the LCD, please follow the solutions shown below.
Problem
Possible Cause
Solution
+DC BUS HIGH
+DC BUS LOW
- DC BUS HIGH
- DC BUS LOW
BUS OVP FAIL
Output has capacitive load or
inductive load.
Decrease the load.
1. Phase difference in parallel system.
2. UPS has an internal fault.
Contact the dealer.
OUTPUT SHORT
Output has short circuit issue.
Check whether output has short
circuit or not. If yes, contact the
dealer.
OVER
TEMPERATURE
The UPS temperature is too high.
1. Choose a well-ventilated area.
2. Decrease the load.
OUTPUT SCR FAIL
1. Output SCR has no driver signal.
2. Output SCR has short issue.
Contact the dealer.
BYPASS SCR FAIL
1. Bypass SCR has no driver signal.
2. Bypass SCR has short issue.
Contact the dealer.
RECTIFIER FAIL
1. Recti er has no driver signal.
2. Recti er has short issue.
Contact the dealer.
INVERTER FAIL
Inverter is damaged.
Contact the dealer.
I/P FUSE BROKEN
Input fuse is broken.
Contact the dealer.
O/P FUSE BROKEN
Output fuse is broken.
Contact the dealer.
FAN FAIL
Fan is damaged or stuck.
Contact the dealer.
OVERLOAD
UPS is overloaded.
Remove the unnecessary load.
PARALLEL FAULT
Parallel cable is not well connected.
Check whether the parallel cable
is well connected.
NO BATTERY
Battery is not connected.
Check whether the battery and
battery cable are well connected.
CHARGER FAIL
Charger is damaged.
Contact the dealer.
REDUNDANCY LOSS
Overload causes redundancy failure.
1. Decrease the load.
2. Disable redundancy function.
UPS1/ UPS2 FW VER
NOT COMPATIBLE
The rmware versions between the two
parallel units are different.
Contact the dealer.
