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Chapter 5 Handling Abnormal Problem 29
E1-20010329-C-1.0
Chapter 5 Troubleshooting
In the event of UPS fault, please check and remove the fault immediately following the
methods described in the table below. If the fault persist , please contact Liebert or its
authoriged agents.
Sequence
No.
Phenomena
Description
Cause Action
1 No panel display and
system self-test when
the Utility switch is in
the ON position.
A. Utility hasn't been
introduced into the
system;
B. Input undervoltage.
Use voltmeter to check
whether the input Utility
voltage is within
tolerances.
2 The Utility is normal,
but the Utility indicator
does not turn to and
the UPS operates in
Battery mode.
A. The input switch is
turned off;
B. The input power line
is not properly
connected;
A. Turn on the input
switch;
B. Make sure that the
input power line is
properly connected;
3 No alarm is given, but
there is no voltage
output.
The output power line is
not properly connected.
Make sure that the output
power line is properly
connected.
4 No panel display and
system self-test when
the Utility switch is in
the ON position.
A. Utility hasn't been
introduced into the
system;
B. Input undervoltage.
Use voltmeter to check
whether the input Utility
voltage is within
tolerances.
5 The Utility indicator
flashes.
The Utility voltage is
outside tolerances.
If the UPS is operating in
Battery mode, please
note the battery backup
time.
6 The buzzer beeps
every 0.5 second, and
the LCD displays
"OVERLOAD"
Overload. Disconnect some loads
from the UPS.
7 The fault indicator is on
and the LCD displays
"BATTERY FAIL".
A. The external battery
switch is turned off, or
its lead is not properly
connected;
B. Battery reverse
connection;
C. Battery damaged;
A. Check whether the
external battery switch is
turned on and its lead is
properly connected;
B. Check whether the
battery is reversely
connected;
C. Contact the distributor
for battery replacement;
8 The fault indicator is
on , and the LCD
displays "CHARGER
FAIL".
Charger fault Contact the Liebert or its
authoriged agent for
charger
replacement/maintenanc
e.