Chapter 5 Troubleshooting - Liebert ITA 6kVA User Manual

In the event of a UPS fault, shoot the trouble in the first instance following the instructions provided in Table 5-1. If the
fault persists, seek technical assistance from the local dealer.
No. Fault phenomenal
The mains MCB is closed, but the UPS
1 provides no display on the display panel,
and the UPS does not conduct self-test
Mains supply is normal, but the mains
2 indicator is off, and the UPS is in battery
mode
No UPS alarm, but no UPS output
3
voltage
After pressing the ON/SILENCE key, the
4
UPS does not start
5 The mains indicator flashes
The buzzer beeps every other 0.5
6 second, and the LCD displays
OVERLOAD
The fault indicator illuminates, the LED
7
displays BATTERY FAIL
The fault indicator illuminates, and the
8
LED displays CHARGER FAIL
The discharge time of battery is shorter
9
than the standard time
The buzzer beeps for a long time, the
10 fault indicator illuminates, and the LED
displays TEMP OVER
The buzzer beeps for a long time, the
11 fault indicator illuminates, and the LED
displays OUTPUT SHORT
The buzzer beeps for a long time, the
fault indicator illuminates, and the LED
12 displays RECTIFIER FAIL, INVERTER
FAIL, AUX SUPPLY FAIL, or OUTPUT
FAIL
13 Abnormal sound or smell in UPS

Chapter 5 Troubleshooting

Table 5-1 Troubleshooting table
No power supply is fed to the
UPS
Input voltage is lower
UPS mains MCB open
Input cables improperly
connected
Output cables improperly
connected
The key holding time is too
short
Overload
Mains voltage or frequency
exceeds UPS input range
Overload
External battery MCB open
External battery cables
improperly connected
External battery polarity
reversed
Battery damaged
Charger failed
Battery not fully charged
Battery capacity has been wore
down
Internal over-temperature
UPS output short circuit
UPS has internal fault
UPS has internal fault
Liebert ITA 6kVA UPS User Manual
®
Chapter 5 Troubleshooting
Possible cause
Check that the UPS input cables are
connected properly
Use a voltmeter to confirm that the UPS
input voltage is within specifications
Close the UPS mains MCB
Connect the UPS input cables properly
Make sure the output cables are properly
connected
Press and hold the ON/SILENCE key for
more than one second till the buzzer beeps
Close all load and restart the UPS
If the UPS is operating in battery mode, pay
attention to the battery back-up time
Remove some non-priority loads
Close the external battery MCB
Check that the external battery cables are
properly connected
Check that the external battery cables are
not reverse-connected
Contact the dealer to replace the battery
Contact the dealer to replace or repair the
charger
When the mains power is normal, charge the
battery for more than eight hours, and then
test the battery discharge time
Contact the dealer to replace the battery
1. Check that air blows out from the
ventilation hole on the rear panel.
2. Check that the clearances on both sides
and at the back of the UPS are greater than
20cm.
3. Check that the ventilation holes on the
front panel, side panels, base plate and rear
panel of the UPS are unobstructed.
4. Wait for ten minutes and restart the UPS
Eliminate the output short circuit fault and
restart the UPS
The UPS needs repair. Seek technical
assistance from the dealer
Turn off the UPS and cut off the power input
immediately. Seek technical assistance from
the dealer
23
Handling