Liebert 300 series Installation, Operaton & Maintenance Manual page 53

3.102 Operator Response
1. Press Alarm Silence pad to cancel the
audible alarm.
Press the Down pad to view the Alarm
Messages screen.
Display.
Continue turning Rotary Switch to Position
1, which de-energizes the UPS while
maintaining the critical load through the
Maintenance By-pass Line.
CAUTION
Do not turn Rotary Switch to position 0.
Doing so will cause an immediate loss of
power to the load.
Alarm
Message
Charger in reduced current mode Customer has selected reduced current operation of the charger
Battery charger problems
DC bus overvoltage
3-20 Installation, Operation and Maintenance Manual
4. Call Liebert Customer Service and Support.
3.11 ALARM MESSAGES
Messages, press the Down pad to see the Alarm
Messages screen. Active Alarm Messages will be
displayed along with a sequence number and
time of occurrence. Note that two or more Alarm
Messages can have the
Continue pressing the Down pad until all active
Alarm Messages have been displayed.
related alarms grouped together) and operator
corrective action, if any. Contact Liebert
Customer Service and Support if you require
assistance.
Meaning and
Corrective
AC INPUT
Frequency or voltage of the input power is outside the
acceptable range. The battery supplies power to the critical load
through the UT'S Module.
DC BUS
charger is insufficient to maintain a charge on the battery.
Contact Liebert Customer Service and Support.
Battery has been discharging and the Low Battery Warning
Time (factory set at 5 minutes, adjustable range 1 to 99
minutes) has been reached. Note time stamp on alarm message.
Follow appropriate procedures to shut
an orderly sequence.
Battery has discharged to the minimum allowable voltage and
the UPS is shut down. No power is being supplied to the critical
input power becomes available, perform a UPS start-
load. When
up procedure.
DC bus voltage has exceeded the specified limit and the charger
has been turned off. The charger will automatically restart
when the DC bus voltage returns to within tolerance. Contact
Customer Service and Support if this condition persists
for more than 2 minutes.
sequence number
same
Action
the critical load in