Chapter 8: Troubleshooting - Delta Amplon RT Series 5-10kVA User Manual

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Chapter 8: Troubleshooting

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