Troubleshooting - PROLiNK Master III Series User Manual

6. TROUBLESHOOTING

Most of the Fault and Warning need to be released by authorized service personnel. Few of them can be solved
by users themselves.
LCD Message
Fault! Bus Over Voltage
Fault! Bus Under Voltage
Fault! Bus Voltage
Unbalance
Fault! Bus Soft Start Time
Out
Fault! Inverter Soft Start
Time Out
Fault! Inverter Voltage
High
Fault! Inverter Voltage Low
Fault! R Inverter Voltage
Short
Fault! S Inverter Voltage
Short
Fault! T Inverter Voltage
Short
Fault! RS Inverter Voltage
Short
Fault! ST Inverter Voltage
Short
Fault! TR Inverter Voltage
Short
Fault! Inverter R Negative
Power
Fault! Inverter S Negative
Power
Fault! Inverter T Negative
Power
Fault! Over Load Fault
Fault! Over Temperature
Fault! CAN Fault
Fault! DSP MCU Stop
Communicate
Fault! Bypass SCR Fault
Warning! EPO Active
Warning! Over Load Fail
Explanation
DC bus voltage is too high
DC bus voltage is too low
DC bus voltage is not balanced
The rectifiers could not start due to low
DC bus voltage within specified
duration
Inverter voltage cannot reach desired
voltage within specified duration
Inverter Voltage is too high
Inverter Voltage is too Low
R phase inverter Output is shorted
S phase inverter Output is shorted
T phase inverter Output is shorted
R-S inverter Output is shorted
S-T inverter Output is shorted
T-R inverter Output is shorted
R phase inverter Output Negative
Power over range
S phase inverter Output Negative
Power over range
T phase inverter Output Negative
Power over range
Heavy overload causes UPS fault.
Make sure adequate space is allowed
for air vents and the fan is working
CAN communication fault
As stated.
As stated.
Check the EPO connector
The load devices are demanding more
Solution
Contact service personnel.
Contact service personnel.
Contact service personnel.
Turn off UPS and then restart the
UPS.
If it fails again, contact service
personnel.
Turn off UPS and then restart the
UPS.
If it fails again, contact service
personnel.
Contact service personnel.
Contact service personnel.
Contact service personnel.
Contact service personnel.
Contact service personnel.
Contact service personnel.
Contact service personnel.
Contact service personnel.
Contact service personnel.
Contact service personnel.
Contact service personnel.
Reduce some load.
Check if the ambient temperature
is over specification.
Or contact service personnel.
Contact service personnel.
Contact service personnel.
Contact service personnel.
Check if the connector is loose
when EPO acts abnormally.
Reduce some load and check
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