Vertiv™ | Liebert® EXM
™
50-250kVA, 480V, 60Hz User Manual | 88
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” and “Bypass
phase reverse.” 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 Vertiv
™
Services at 800-543-2378 for assistance.
Inverter Asynchronous
This alarm is triggered by an inverter software routine when the inverter and bypass waveforms
are misaligned by more than 6 degrees in phase. This alarm resets automatically once the
condition is no longer true.
1. First check if the alarm “Bypass unable to trace” or “Bypass abnormal” occurs. If so, solve it
first.
2. Verify the waveform of the bypass voltage. If it is too distorted, ask the customer to verify
and seek any possible measurements.
Contact Vertiv
™
Services at 800-543-2378 for assistance.
Inverter Fault
This alarm indicates a fault condition exists within the inverter. Contact Vertiv
™
Services at 800-
543-2378 for assistance.
Fan Fault At least one of the cooling fans failed. Contact Vertiv
™
Services at 800-543-2378 for assistance.
Inverter STS (relay) Fail
At least one of the static switches of inverter side is open or short circuit. This fault is locked until
power off. Contact Vertiv
™
Services for assistance at 800-543-2378 for assistance.
Bypass STS Fail
At least one of the static switches of bypass side is open or short circuit. This fault is locked until
power off.
Contact Vertiv
™
Services at 800-543-2378 for assistance.
Output Fuse Fail
At least one of the output fuses is open. Contact Vertiv
™
Services at 800-543-2378 for
assistance.
Unit Overload
The UPS is confirmed to be overload when the load arises above 105% nominal rating.
The alarm automatically resets once the overload condition is removed.
1. Confirm that the alarm is true by checking the load percent indicated on the LCD panel to
determine which phase is being overloaded.
2. If the alarm is true, measure the actual output current to verify that the indications are valid.
Disconnect unnecessary load and ensure the safety. In a parallel system, a severe load
sharing error can also leads to the alarm.
Contact Vertiv
™
Services at 800-543-2378 for assistance.
System Overload
The UPS parallel system is confirmed to overload when the total load arises above 105% nominal
rating for the set basic number of UPSs. The alarm automatically resets once the overload
condition is removed.
1. Confirm that the alarm is true by checking the system load percent indicated on the LCD
panel to determine which phase is being overloaded.
2. If the alarm is true, measure the actual output current to verify that the indications are valid.
Disconnect unnecessary load and ensure the safety. In a parallel system, a severe load
sharing error can also leads to the alarm.
Table 34 UPS status messages (continued)
Event Message Description / Suggested Action (if any)
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