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Operation
81
Input
OverVoltage
Input Over
Voltage
Alarm NO NO NO YES
For all of these input problems the system
will supply power from the battery until the
end of discharge. At that point single input
systems will lose power to the load. Dual
input systems will attempt to transfer to
bypass if qualified and available. Call
Liebert Global Services for Assistance.
Input current
limit
Input Current
Limit
Alarm NO YES NO YES
The RMS input current has reached the
Input Current Limit setting. Check the UPS
load.
Battery CB
Open
Battery CB
Open
Alarm NO YES NO YES
The module battery circuit breaker (MBD) is
open. This circuit breaker might have been
opened either manually or automatically in
a UPS shutdown procedure. If the UPS is
operating with this breaker open, the critical
load is not protected from loss of the utility
source power. Manual closure of the battery
breaker is inhibited. You must use the front
panel to set up the sequence for manual
battery re-closure. Follow the instructions in
manual start-up.
Batt Supp
Active
Batt sup-
plement is
active
Alarm NO YES NO YES
This condition is indicated when the Batt
Discharging and Input Undervoltage alarms
are simultaneously active. The alarm will
clear when the Inp. Undervoltage alarm
clears and/or if the rectifier turns off and/or
if the Batt Dischg alarm clears.
Bypass Sync
Error
Bypass Sync
Error
Alarm NO YES NO YES
The bypass is out of sync to a sufficient
degree that transfer to Static Bypass is
inhibited. An interrupted transfer will be
permitted only in the case of a critical fault.
If this alarm persists, contact Liebert Global
Services.
Byp out
Tolerance
Bypass
Voltage Out of
Tolerance
Alarm NO YES NO YES
One or more bypass voltages is below 80%
or above 115% of the nominal value. If the
load is on UPS, and the unit is a dual input
unit, transfers to bypass will be inhibited. If
the unit is a single input unit, the system will
shut down. The Alarm will be cleared 5
seconds after all voltage are again with 85-
110% of nominal. If the load has been shut
down, re-start will be required.
Bypass Line
Fail
Bypass Line
Fail
Alarm NO YES NO YES
The bypass source has dropped below 35V
per phase. On single input units, the UPS
will shut down. On dual input units, transfer
to the bypass will be inhibited. The alarm
will be cleared five seconds after all
voltages again exceed 45V. If the unit is
already on Bypass when this occurs, power
to the load will be lost.
Table 7 Alarms, functions, and corrective actions (continued)
Actual
Alarm/fault
Name
Displayed
On Front
Panel
Description
of Alarm/
Fault
Fault
Or
Alarm
Latch
Mask
Dial
Mask
Freeze
Mask
Event Log
Mask Meaning and Corrective Action(s)