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Operation 53
Charger Battery Voltage High
Charger Battery Voltage Low
The DC voltage of the battery
charger is outside the specified limits
and the charger has been turned off.
The charger will automatically restart
when the DC bus voltage returns to
within tolerance.
Make sure battery breaker is closed.
Contact Liebert Global Services if
this condition persists for more than
15 minutes.
Charger Fuse Blown The battery circuit breaker is open or
the battery charger fuse has been
blown. The charger is no longer
charging the batteries.
Check the battery circuit breaker. If
the breaker is open, try to reset. If the
breaker will not reset or is not open,
Contact Liebert Global Services.
Charger Hardware Shutdown Malfunction in the battery charger
section. If this condition persists
without service, the batteries can be
discharged.
Contact Liebert Global Services.
Dial Out Attempt Failed If the unit is equipped with an internal
modem, it attempted to dial out due
to an event or command on the
modem connected to the UPS. The
attempt was unsuccessful after 3
tries.
Check the phone number
programmed into the modem. Check
the receiving modem. Check the
modem operation.
Excessive Retransfers
Attempted
Several automatic retransfer
attempts (20 attempts during 15
minutes or less) have been made to
retransfer the load from bypass (if
available) back to the UPS. The UPS
has not been able to consistently
sustain the load, because of an
overload condition or an inverter
failure. The load will remain on
bypass.
Check other messages for inverter
failure. Determine cause of the
overload and reduce the load. If the
problem cannot be corrected, call
Liebert Global Services.
Emergency off. Recycle input
to restart.
The UPS has been shut down from
an external contact (REPO) or the
front panel EPO switch.
Perform a UPS start-up procedure
when the conditions causing the
external shutdown have been
corrected. See 3.2.3 - Manual
Restart after Low Battery
Shutdown.
Fault Transferred to Bypass The unit transferred to bypass due to
a fault or overload in the system. This
alarm accompanies the other alarms
that caused the fault.
Review other alarms. Remove
condition-causing fault if possible
(e.g., reduce overload). Call Liebert
Global Services if fault cannot be
cleared.
Ground Fault detected
on DC bus.
There is a ground fault in the battery
cabinet or battery wiring.
Contact Liebert Global Services
immediately.
Input Voltage Out-of-
Tolerance
The line to line voltage of the input
power is outside the acceptable
range. In this situation, if the voltage
is low the battery will supply power to
the critical load through the UPS.
If this condition persists the battery
will eventually completely discharge.
Check your electrical wiring. Check
with your utility.
Inverter Fuse Blown The inverter fuse has opened
indicating a failure in the inverter
section of the UPS. The unit will
transfer the load to Bypass.
Contact Liebert Global Services
immediately.
Inverter Neutral SCR Open On units equipped with the isolated
neutral option, the SCR has failed.
Contact Liebert Global Services.
Inverter Startup Overvolt The inverter bus is too high during
the walk-in period. Possible fault on
the PFC.
Contact Liebert Global Services.
Table 5 Alarm Messages (continued)
Alarm Message Meaning Corrective Action