35
Alarm or Event Possible cause Remedy
BUS Under Voltage
Fault (Red) LED is On.
Beep continuous.
Indicates that the UPS has bus undervoltage
fault.
The UPS transfers to bypass mode if
supporting the load.
BUS Unbalance
Fault (Red) LED is On.
Beep continuous.
Indicates that the positive bus voltage and
negative bus voltage are too lopsided.
The UPS transfers to bypass mode if
supporting the load.
BUS Short
Fault (Red) LED is On.
Beep continuous.
Indicates that the bus voltage is decreasing
very fast.
Contact your service representative.
BUS Softstart Fail
Fault (Red) LED is On.
Beep continuous.
Indicates that the bus could not soft start
successfully.
Contact your service representative.
Inv Over Voltage
Fault (Red) LED is On.
Beep continuous.
Indicates that the UPS has inverter
overvoltage fault.
The UPS transfers to bypass mode if
supporting the load.
Inv Under Voltage
Fault (Red) LED is On.
Beep continuous.
Indicates that the UPS has inverter
undervoltage fault.
The UPS transfers to bypass mode if
supporting the load.
Inv Softstart Fail
Fault (Red) LED is On.
Beep continuous.
Indicates that the inverter could not soft start
successfully.
Contact your service representative.
Charger Fail
Fault (Red) LED is flash
Indicates that the UPS has confirmed the
charger has failed.
The UPS turns off the charger until the next
power recycle. Contact your service
representative.
Battery Over Voltage
Fault (Red) LED is On.
Beep continuous.
Indicates that the battery voltage is too high.
The UPS will turn off the charger until the
battery voltage is normal.
Negative power Fault
Fault (Red) LED is On.
Beep continuous.
In a parallel system, power of UPS is negative.
Redundancy mode, the fault UPS turn to fault
mode without output
mode.
Parallel cable loss
Fault (Red) LED is On.
Beep continuous.
In parallel system, parallel cable disconnected.
Disconnect parallel cable one turn to fault
mode.
Parallel system battery
status
Fault (Red) LED is flash
Check battery connect status.
Line input different
Fault (Red) LED is flash
Check the line input.
Power strategy different
Fault (Red) LED is flash
Parallel system, UPS mode (normal, converter,
HE) different.
Check UPS OP mode, keep OP mode be the
same.
Rate power different
Fault (Red) LED is flash
Parallel system rated power different.
Rated power different, not allowed to turn on
UPS. Keep rated power the same.
HE in parallel
Fault (Red) LED is flash
Parallel system, UPS mode set as HE
HE not allowed in parallel system, change UPS
mode.
6 TROUBLESHOOTING
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