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64
8. Troubleshooting
Fault and Warning events should be reviewed by authorised service personnel.
LCD Message Explanation Solution
Fault! Bus Over Voltage DC bus voltage is too high. Contact service personnel.
Fault! Bus Under Voltage DC bus voltage is too low. Contact service personnel.
Fault! Bus Voltage Unbalance DC bus voltage is not balanced. Contact service personnel.
Fault! Bus Short DC bus is short. Contact service personnel.
Fault! Bus Soft Start Time Out The rectifiers could not start due to low DC bus
voltage within specified duration.
Turn off UPS and then restart the UPS.
If it fails again, contact service personnel.
Fault! Inverter Soft Start Time Out Inverter voltage cannot reach desired voltage within
specified duration.
Turn off UPS and then restart the UPS.
If it fails again, contact service personnel.
Fault! Inverter Voltage Over Inverter Voltage over (Peak Value). Contact service personnel.
Fault! Inverter Voltage High Inverter Voltage is too high. Contact service personnel.
Fault! Inverter Voltage Low Inverter Voltage is too Low. Contact service personnel.
Fault! R Inverter Voltage Short R phase inverter Output is shorted. Contact service personnel.
Fault! S Inverter Voltage Short S phase inverter Output is shorted. Contact service personnel.
Fault! T Inverter Voltage Short T phase inverter Output is shorted. Contact service personnel.
Fault! RS Inverter Voltage Short R-S inverter Output is shorted. Contact service personnel.
Fault! ST Inverter Voltage Short S-T inverter Output is shorted. Contact service personnel.
Fault! TR Inverter Voltage Short T-R inverter Output is shorted. Contact service personnel.
Fault! Inverter R Negative Power R phase inverter Output Negative Power over range. Contact service personnel.
Fault! Inverter S Negative Power S phase inverter Output Negative Power over range. Contact service personnel.
Fault! Inverter T Negative Power T phase inverter Output Negative Power over range. Contact service personnel.
Fault! Over Load Fault Heavy overload causes UPS fault. Reduce some load.
Fault! Battery Fault Battery reverse. Check the polarity of battery connection and
contact service personnel.
Fault! Over Temperature Make sure adequate space is allowed for air vents
and the fan is working.
Check if the ambient temperature is over
specification or contact service personnel.
Fault! CAN Fault CAN communication fault. Contact service personnel.
Fault! TRIG0 Fault Synchronised trigger signal fault. Contact service personnel.
Fault! Relay Fault Inverter relay fault. Contact service personnel.
Fault! Line SCR Fail Line SCR short circuit fault. Contact service personnel.
Fault! EEPROM Fault EEPROM operation error. Contact service personnel.
Fault! Parallel Cable Loosen Fault As stated. Check if the parallel cable is loose and
contact service personnel.
Fault! DSP MCU Stop Communicate As stated. Contact service personnel.
Fault! Bypass Temperature Fault As stated. Check if the ambient temperature is over
specification or contact service personnel.
Fault! Bypass SCR Fault As stated. Contact service personnel.
Warning! EPO Active Check the EPO connector. Check if the connector is loose when EPO
acts abnormally.
Warning! Over Load Fail The load devices are demanding more power than
the UPS can supply. Line Mode will transfer to
Bypass Mode.
Reduce some load and check output Load-
Capacity and specification.
Warning! Communicate CAN Fail CAN communication error. Contact service personnel.
Warning! Over Load When in Line Mode, the load devices are
demanding more power than the UPS can supply.
Reduce some load and check output Load-
Capacity and specification.
Warning! Battery Open Battery not connected. 1. Check battery breaker.
2. Check if the battery connection is well
connected.
3. Check the setting of Nominal Battery
voltage.
4. Contact service personnel if necessary.
Warning! Battery voltage High Battery voltage is too High. Check the setting of Nominal Battery voltage
and contact service personnel.
Warning! Turn On Abnormal As stated. Check if the input voltage or frequency is out
of range.
Warning! Charge Fail As stated. Contact service personnel.
Warning! EEPROM Fail EEPROM operation error. Contact service personnel.
Warning! Fan Lock As stated. Check if the fan is blocked or contact service
personnel.
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