22
5.5.
Inverter Failure
Output load short circuit when supplied via inverter
If the output load is short-circuited while supplied via inverter, the UPS will shut
down the inverter automatically and cut the supply to the loads. The Fault LED
will shine, and the buzzer will beep continuously. The UPS will not switch on
automatically after the short-circuit condition is eliminated. The UPS must be
restarted manually. (Refer to section 4.3.1.1. ‘Start Up in Normal AC Mode’.)
RECTIFIER
AC/DC CONVERTER
DC/DC CONVERTER
INVERTER
STATIC SWITCH
(SSM)
CHARGER
BATTERY
O/P
OUTPUT
UTILITY
Fig 5.5
5.6.
Overheating
If the UPS overheats when the utility is normal it will switch into bypass mode.
The UPS will switch back to inverter mode when the overheating is eliminated.
If overheating occurs when the utility is abnormal the buzzer will beep
continuously and the Fault LED
will shine. The UPS will cut off supply to
the loads.
5.7.
Inverter Current or Voltage Out of Tolerance
If the UPS inverter delivers over-current or out-of-tolerance voltage to its
outlets then the UPS is out of order. The UPS will switch into bypass mode
when the utility is normal. The Utility
LED, Bypass
LED, and Fault
LED will shine.
If these two fault conditions occur when the utility is abnormal the UPS will cut
off the supply to its outlets, and the Fault
LED will shine.
23
6. Maintenance
Guide
6.1.
Troubleshooting
If the UPS malfunctions during operation please check that all lines are
connected properly and that the utility specifications are correct. Then check the
table below for solutions. Should the problem persist please contact your local
dealer for assistance.
Situation Check
Items
Solution
1. Er05,Er24
1. Check for proper battery
connection. Measure battery
voltage to ensure that batteries
are charged and healthy.
Recharge batteries for 8 hours if
necessary. Simulate utility outage
to verify that UPS is able to
provide DC backup. Otherwise
consult your local dealer right
away.
2. Overload
2. Disconnect some non-critical
loads from the UPS output until
the overload ceases. Check if
there is any short circuit between
cables due to broken cable
insulation. Replace the cables if
necessary.
3. Er11 (UPS Over
Temperature)
3. Remove any objects obstructing
the ventilation louvers. Verify that
the cooling fans are working
properly. Contact your local
dealer to replace the fans if
necessary.
4. Site wiring/Ground fault
4. Check if the “L” and “N” phases of
the utility AC source have been
wrongly wired or if the Ground-
Neutral voltage exceeds the
limits.
5. Er14 (Fans out of order)
5. Verify that the ventilating fans are
functioning properly. Do not
attempt to replace the fans
yourself. Contact your local dealer
for replacement.
Fault
LED
Read the error code (see
next page) displayed by
the combination of LEDs,
and verify the fault as
follows.
6.Other error codes
6. Consult your local dealer for
assistance.
Summary of Contents for 1K
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