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Operation 55
Output Overload The units total output power (the sum
of all three phases) has exceeded
the overload capacity of the unit. The
load will be automatically transferred
to bypass (if available).
Determine cause of the overload and
reduce the load.
Output Undervoltage
Output Overvoltage
Overload Phase A
Overload Phase B
Overload Phase C
UPS output voltage or current is not
within the acceptable range. The
load has been automatically
transferred to bypass (if available).
An automatic retransfer will be
attempted when the output voltage
and current are within tolerance.
Contact Liebert Global Services if the
UPS is not able to correct any one of
these conditions.
PFC Bus Voltage High
PFC Bus Voltage Low
PFC Hardware Shutdown
The inverter bus voltage is either
high or low or exceeded acceptable
limits. The unit will transfer to bypass.
Contact Liebert Global Services.
Site Wiring Error Warning Alarm: The power
conductors are not wired to the UPS
input in the desired sequence.
Disconnect power from the UPS
input and correct the wiring. Wiring
should be verified or corrected by a
qualified electrician.
System shutdown impending
due to over-temperature
The input filter may be clogged or 1
or more cooling fans may have failed
and the internal temperatures are
approaching the automatic shutdown
level.
Check input air filter. Reduce the
system load as much as possible.
Contact Liebert Global Services.
System shutdown due to
internal over-temperature
The UPS system has shut down and
transferred to Bypass as a result of a
clogged input filter or failure of 1 or
more fans.
Contact Liebert Global Services.
Temporary Overload The output waveform is distorted. If
available, the UPS will transfer to
bypass until the waveform distortion
is corrected.
Normally the condition will correct
itself. If the unit has not corrected this
condition within 30 minutes, contact
Liebert Global Services.
UPS Overtemp System shutdown impending due to
over-temperature.
This is a two-stage alarm. The same
message will occur if the system has
reached over-temp and has
transferred to bypass as a result of
the over-temp condition.
Other alarms will signal the transfer
to bypass.
An over-temperature condition is
present in the UPS cabinet. The UPS
will automatically transfer to bypass if
the over-temperature continues.
Determine the cause of the condition
and correct it if possible. Check for
restricted air flow or fan failure.
UPS Shutdown The UPS has detected a fault and
has shut down, resulting in loss of
power to the critical load.
Review and record alarm messages.
Contact Liebert Global Services.
Liebert Global Services 1-800-543-2378
Table 5 Alarm Messages (continued)
Alarm Message Meaning Corrective Action