Xtreme Power Conversion Corporation
M90U-80 & 140 User’s Manual
Page 68
Uninterruptible Power Supply
6. Troubleshooting
The M90U-80 & 140 can alarm for the following faults or warnings:
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 Nega
-
tive Power over range
Contact service personnel.
Fault! Inverter S Negative
Power
S phase inverter Output Nega
-
tive Power over range
Contact service personnel.
Fault! Inverter T Negative
Power
T phase inverter Output Nega
-
tive 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
Synchronized trigger signal
fault
Contact service personnel.