UPS Status Messages
30
33 Inv. Inductor Overtemp.
The temperature of the output filter inductor is too high to keep inverter running.
This alarm is triggered by the signal from a thermostat mounted in the output filter inductor.
The UPS would recover automatically after a 5 minute delay from the disappearance of the
over temperature signal.
Suggested Action
1. If the over temperature condition is true then check for and verify:
a. high ambient air temperature.
b. blocked cooling airway.
c. any fan failure.
d. prolonged inverter overload.
2. If the over temperature condition is not true, then check the connection of thermostats
and wiring from M4 measure brd to U1 control board. Replace or repair it if any open-
circuit error is found. If no open-circuit error is found, then replace the U1 board.
34 Inverter Overtemp.
The temperature of the inverter heat sink is too high to keep inverter running.
This alarm is triggered by the signal from a temperature monitoring thermostat on the
inverter bridge heat sink.
The UPS will recover automatically after a 5 minute delay from the disappearance of the
over temperature signal.
Suggested Action
1. If the over temperature condition is true then check for and verify:
a. high ambient air temperature.
b. blocked cooling airway.
c. any fan failure.
d. prolonged inverter overload.
2. If the over temperature condition is not true, then check the connection of thermostats
and wiring from M4 measure brd to U1 control brd. Replace or repair it if any open-
circuit error is found. If no open-circuit error is found, then replace the U1 board.
35 Fan Fault
At least one of the cooling fans fails. This alarm is triggered when the fan fault signal is a
pulse whose duty is greater than 2/3 when bypass or inverter is in power supply.
It is just an alarm and nothing is activated. This alarm resets automatically once the
condition is no longer true.
Suggested Action
Confirm that the alarm is true by finding out which fan is not running correctly.
1. If the alarm is true, replace the abnormal fans.
2. If the alarm is false:
a. check the fan fault signal from M4 measure board and U1 control board.
b. replace the U1 board or M4 board as required.
36 Inverter STS Fail
At least one of the static switches of inverter side is open or short circuit. This fault is locked
until power off.
This fault is triggered when the inverter voltage or the output voltage satisfies one of the
following conditions:
1. The output voltage goes above 120V when the inverter is on with bypass and output
disconnect open, bypass SCR and inverter SCR drive invalid. This condition set an
inverter STS short-circuit fault.
2. The inverter voltage goes above 120V when the inverter is off. If the inverter current
goes above 10% rating at the same time, the confirm time would be shorten. This
condition set an inverter STS short-circuit fault.
3. The inverter voltage goes below 80V with inverter STS drive valid. This condition set an
inverter STS open-circuit fault.
Suggested Action
1. Power off the UPS (with maintenance bypass closed). Check the inverter SCRs for
open circuit and short circuit. Also check the gate drivers.
2. If the SCRs are OK then check the output voltage, inverter voltage and current signal
inputs to U1 control board via the M4 measure board, and repair or replace them as
necessary.
3. Sometimes this fault can be triggered by floating output voltage due to the absence of
output EMI board. Verify the displayed output voltage and the status of output EMI
board.
Table 8 UPS status messages (continued)
No. Event Message Description / Suggested Action (if any)
To Next Page
Loading...
Need help?
General
