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APPENDIX BUPS STATUS MESSAGES
Table 57 shows all event messages as they appear in the current status area of the LCD or the
history log, along with a description and recommended actions, if any. For further information on the
current status area and the history log, see 9.10 - UPS History Log.
Table 57 UPS status messages
Event Message Description / Suggested Action (if any)
Comm. Fail
The CAN communication between internal monitor and rectifier/inverter/bypass fails. Contact
Liebert Services at 800-543-2378 for assistance.
Battery Overtemp. The Battery temperature is over limit. Check the battery temperature and ventilation.
Ambient Overtemp. The Ambient temperature is over limit. Check the ventilation of UPS room.
Replace Battery Battery should be replaced. Contact Liebert Services at 800-543-2378 for assistance.
Battery Low Pre-warning
Before the end of discharging, battery under-voltage pre-warning should occur. After this pre-
warning, battery should have the capacity for 3 minutes discharging with full load. The time is
user configured from 3 to 60 minutes.
Shut down the load in time.
Battery End of Discharge
Inverter turned off due to low battery voltage.
Check the utility failure and try to fix it.
Mains Volt. Abnormal
Mains Voltage exceeds the upper or lower limit and results in rectifier shutdown.
Check the input line-to-neutral voltage amplitude of rectifier.
Mains Undervoltage
Mains Voltage is undervoltage (120v~132V).
Check the input line-to-line voltage amplitude of rectifier.
Mains Freq. Abnormal
Mains frequency is out of limit range and results in rectifier shutdown.
Check the rectifier’s input voltage frequency.
Rectifier Fault Rectifier Fault; Contact Liebert Services at 800-543-2378 for assistance.
Rectifier Overtemp.
The temperature of heat sink is too high to keep the rectifier running.
The UPS can recover automatically. Check the environment and ventilation.
Charger Fault The Charger has failed. Contact Liebert Services at 800-543-2378 for assistance.
Input Fuse Fail Input fuse is open. Contact Liebert Services at 800-543-2378 for assistance.
Control Power 1 Fail
Control Power 1 has failed or has been lost. Contact Liebert Services at 800-543-2378 for
assistance.
Mains Phase Reversed Input phase sequence is reversed. Contact Liebert Services at 800-543-2378 for assistance.
Soft Start Fail
Rectifier could not start due to low DC bus voltage. Contact Liebert Services at 800-543-2378 for
assistance.
Bypass Unable to Trace
This alarm is triggered by an inverter software routine when the amplitude or frequency of bypass
voltage is beyond the normal range.
The amplitude threshold is fixed for positive and negative 10% rating.
This alarm automatically resets once the bypass voltage goes normal.
1. First verify that the bypass voltage and frequency displayed on the panel is within the selected
range. Note here the rated voltage and frequency are specified by “Output voltage level” and
“Output frequency level” respectively.
2. If the displayed voltage is believed to be abnormal, then verify the bypass voltage and
frequency presented to the UPS. Check the external supply if it is found to be faulty.
Contact Liebert Services at 800-543-2378 for assistance.
Bypass Abnormal
This alarm is triggered by an inverter software routine when the amplitude or frequency of bypass
voltage exceeds the limit.
This alarm automatically resets once the bypass voltage goes normal.
First check if there are some relevant alarms such as “Bypass disconnect open”, “Bypass phase
reverse” and “Mains neutral lost”. If they appear, solve them first.
1. Then verify that the bypass voltage and frequency displayed on the panel is within the bypass
limit. Note here the rated voltage and frequency are specified by “Output voltage level” and
“Output frequency level” respectively.
2. If the displayed voltage is believed to be abnormal, then verify the bypass voltage and
frequency presented to the UPS. Check the external bypass supply if it is found to be faulty. If
the utility is likely to trigger this alarm frequently, the bypass limit can be changed a little larger
through the configuration software according to the customer’s agreement.
Contact Liebert Services at 800-543-2378 for assistance.