Xtreme Power Conversion Corporation
M90 & M90L Service Manual
Page 18
Uninterruptible Power Supply
Trouble shooting for fault codes in LCD display
When the UPS is fault, it will transfer to Fault mode.
Representation in display
LCD
Explanation
Conduct item
Fault! Bus Over Voltage
DC bus voltage is too high
Shutdown and remove this power
module
Check have any problem this mod
-
ule
Fault! Bus Under Voltage
DC bus voltage is too low
Shutdown and remove this power
module
Check have any problem this mod
-
ule
Fault! Bus Voltage Unbalance
DC bus voltage is not balanced
Shutdown and remove this power
module
Check have any problem this mod
-
ule
Fault! Bus Short
DC bus is short
Shutdown and remove this power
module
Check have any problem this mod
-
ule
Fault! Bus Soft Start Time
Out
The rectifiers could not start due to
low DC bus voltage within
specified duration
Shutdown and remove this power
module
Check pre-charge of PFC PCBA
Fault! Inverter Soft Start
Time Out
Inverter bus voltage cannot
reach desired voltage within
specified duration
Shutdown and remove this power
module
Check IPOP and Inverter PCBA
Fault! Inverter Voltage High
Inverter Voltage is too high
Shutdown and remove this power
module
Check IPOP and Inverter PCBA
Fault! Inverter Voltage Low
Inverter Voltage is too Low
Shutdown and remove this power
module
Check IPOP and Inverter PCBA
Fault! R Inverter Voltage
Short
R phase inverter Output is shorted
Shutdown and remove this power
module
Check IPOP and Inverter PCBA
Fault! S Inverter Voltage
Short
S phase inverter Output is shorted
Shutdown and remove this power
module
Check IPOP and Inverter PCBA
Fault! T Inverter Voltage
Short
R-S inverter Output is shorted
Shutdown and remove this power
module
Check IPOP and Inverter PCBA
Fault! ST Inverter Voltage
Short
S-T inverter Output is shorted
Shutdown and remove this power
module
Check IPOP and Inverter PCBA
