Liebert 30-130kVA Operation And Maintenance Manual page 84

Table 7 Alarms, functions, and corrective actions (continued)
Actual
Alarm/fault
Name
Displayed Description
On Front of Alarm/
Panel Fault
Inverter
Inverter Ovld
Overload
xfer
Transfer
Inverter Fuse Inverter Fuse
Fail Fail
Output
Output Ov
Overvolt
xfer
Transfer
Output
Output Uv
Undervolt
xfer
Transfer
SBS SCR SBS SCR
Open Open
SBS SCR SBS SCR
Shorted Shorted
Fault
Or Latch Dial Freeze
Alarm Mask Mask Mask
Fault YES YES
Fault YES YES
Fault NO YES
Fault NO YES
Fault YES YES
Fault YES YES
Event Log
Mask Meaning and Corrective Action(s)
With the load on UPS, at least one phase of
the UPS KVA or KW has exceeded the
rated KVA, KW, or RMS current vs. Time
equation. (Note: This fault would have been
preceded by an "Inverter Overload Phase x
alarm.) The UPS will transfer the load to
YES YES Static Bypass if it is available. If the fault or
overload clears the UPS will automatically
transfer from SBS to UPS. Remove the
excess load from the UPS and attempt to
re-start. If the load is below the rating of the
UPS and it will not re-start, contact Liebert
Global Services.
One or more Output Fuses are open.
(because of capacitance in the system it
may take up to 1 minute after a fuse failure
NO YES to detect this fault). The system will transfer
the load to Static Bypass if available and
then shut down the UPS. Contact Liebert
Global Services Immediately.
The UPS module output voltage is above
the maximum (+10%) deviation from
nominal. The load automatically transfers to
YES YES the bypass line. The UPS module is shut
down and isolated. Contact Liebert Global
Services at once. Do not attempt to reset
circuit breakers.
The UPS module output voltage is under
the minimum (-12%) deviation from
nominal. The load automatically transfers to
the bypass line. If the alarm condition is no
YES YES
longer present, reset the alarm and
retransfer the load from bypass to UPS.
Contact Liebert Global Services if alarm
persists.
This fault can only be detected when the
load is on bypass. One or more of the Static
Bypass phases are open. The static switch
NO YES will be shut down and the UPS will shut
down. Power to the load will be lost.
Contact Liebert Global Services
Immediately.
The system has detected a shorted SCR in
the Bypass line. If the unit is in the start-up
mode, start- up will be inhibited. If the unit is
on UPS, the unit will transfer to Bypass and
NO YES
open the output contactor to prevent back
feed to the inverter from the Bypass line.
Contact Liebert Global Services
Immediately.
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Operation