C650 & C650R User
Manual Page 36
Use the following troubleshooting chart to determine the UPS alarm condition.
WARNING
Problem Displayed
Possible cause
Remedy
On Maintain Bypass
Maintain bypass switch is open
Check the maintain bypass switch position.
Site Wiring alarm
Phase and neutral conductor at input
of UPS system are reversed
Reverse mains power wiring.
No battery
Battery pack is not connected
correctly
Do a battery test to confirm.
Check the battery bank is properly connected to the UPS.
Check the battery breaker is turn on or fuse OK.
Battery low
Battery voltage is low
When audible alarm sounding every second, battery is almost empty.
End battery life
The battery has reached the end of its
life
Consult dealer if replace the battery
Power overload
Power requirements exceed the UPS
capacity
Check the loads and remove some noncritical loads.
Check if some loads are failed
Overload pre-alarm
The load exceeds the pre-set value
Check the loads or reset the pre-alarm value
Fan Lock
Fan abnormal
Check if the fan is running normally or fan detection cable disconnected
UPS temp. alarm
Inside temperature of UPS is too high
Check the ventilation of UPS and the ambient temperature.
Amb. temp. alarm
The ambient temperature is too high
Check the environment ventilation
Imminent shutoff
Insufficient battery backup time
Protect load equipment in time
FAULT
Problem Displayed
Possible cause
Remedy
Inverter overload
Overload
Check the loads and remove some noncritical loads.
Check if some loads are failed.
Bypass overload
Overload
Check the loads and remove some noncritical loads.
Check if some loads are failed.
Out. short circuit
abnormally low impedance placed on
its output and considers it a short
circuit
Remove all the loads. Turn off the UPS.
Check if UPS output and loads is short circuit.
Ensure short circuit is removed before turning on again.
UPS temp. fault
Inside temperature of UPS is too high
Check the ventilation of UPS and the ambient temperature.
DC bus + or - too high
UPS internal fault, the + or -DC BUS
voltage is too high
Consult dealer.
DC bus + or - too low
UPS internal fault, the + or -DC BUS
voltage is too low
Consult dealer.
DC bus unbalanced
UPS internal fault, the voltage
difference between DC Bus+ and DC
bus- is too large
Consult dealer.
DC bus short circ.
UPS internal fault
Consult dealer.
Max inverter volt
UPS internal fault, the inverter
voltage is too high
Consult dealer.
Min inverter volt
UPS internal fault, the inverter
voltage is too low
Consult dealer.
ELSE CASES
Problem Displayed
Possible cause
Remedy
No indication, no
warning tone even
though system is
connected to mains
power supply
No input voltage
Check the building wiring and input cable.
Check if the input breaker is closed.
Green LED is not on
even though the
power supply is
available
Inverter not switched on
Press On-Switch to turn on UPS.
