Vertiv™ |
Liebert® EXM™ UPS 20-100kVA, 50/60Hz User Manual |
68
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 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.
Control Power 2 Fail
Control Power 2 is abnormal or lost. 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.
Unit Overload Timeout
The UPS is confirmed to overload and the overload times out.
Note 1: The highest loaded phase will indicate overload timing-out first.
Note 2: When the timer is active, then alarm “unit overload” should also be active as the load is above nominal.
Note 3: When the timer has expired, the inverter Static Switch is opened and the load transferred to bypass. The
inverter shutdown and will restart after 10 seconds.
Note 4: If the load decreases lower than 95% after 5 minutes, the system will transfer back to inverter mode.
Confirm that the alarm is genuine by checking the load percent indicated on the LCD. If an overload is indicated
then check the load, and investigate any additional load connected prior to the alarm (if applicable).
Bypass Phase Reversed
The phase sequence direction of bypass voltage is reversed.
Normally, the phase of Phase B lags 120 degrees behind Phase A, and the phase of Phase C lags 120 degrees
behind Phase B.
Verify that the phase rotation of the bypass supply presented to the UPS is correct, and rectify it if it is found to
be in error. Contact Vertiv
™
Services at 800-543-2378 for assistance.
Table 31
UPS status messages
(continued)
Event Message
Description / Suggested Action (if any)
Summary of Contents for Liebert EXM
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