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5.4. Inverter Failure
5.4.1. Output short circuit under inverter mode
If output load is short circuited under inverter mode, the UPS will turn off the output
to prevent damage to its Inverter and the connected load. The Fault LED lights up
and the buzzer sound continuously. The UPS will not turn on automatically after
short circuit condition is eliminated. You are required to re-start the UPS manually.
To re-start the UPS after short circuit condition is removed, you should push the
Main Switch on the front panel to "OFF" position first, then To "ON" position again.
5.4.2. Output Short circuit under bypass Mode
If output load is short circuited under bypass mode, the AC fuse will trip open to
prevent damage to the output load. You should replace a new fuse with same
rating after the short circuit condition is eliminated.
5.5. Inverter Over temperature
If the UPS experiences over-temperature when Utility is normal, it will switch to
bypass mode. The UPS will switch back to inverter mode when the
over-temperature situation is eliminated. If it happens when Utility is abnormal, the
buzzer will beep continuously and the Fault LED will light up. The output of the
UPS will also be cut off.
5.6. Inverter Over
-current and Inverter Output Voltage Out of tolerance
If the UPS inverter delivers over-current and out-of-tolerance voltage to its output,
the UPS is out of order. The UPS will switch to bypass mode when Utility is normal.
The Utility LED, Bypass LED and Fault LED will light up.
If these two conditions occur when Utility is abnormal, the UPS will turn off the
Output and the Fault LED will light up.
O/P
OUTPUT
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Chapter 6. Maintenance Guide
6.1. System Block Diagram
6.2. Trouble Shooting
When the UPS malfunctions during operation, you may check the list below for
respective solution. Should the problem persists, please Contact your local
distributor for help.
Situation Check Items Solution
Utility LED is not on and the
UPS is on battery mode, when
Utility is normal.
AC Input cord has
loose connection or
AC Input fuse is
blown.
1. Secure the AC Input
cord properly to the wall
receptacle.
2. Replace the AC fuse
with the same rating.
3. If problem persists,
please call for service.
The UPS switches to battery
mode then back to Utility
mode, when connected device
is turned on. Or, the UPS
Switches back and forth
between battery and Utility.
1. Check if any power
strip is connected
to the UPS.
2. Faulty Utility
Receptacle.
1. Do not use power strip.
2. Get the Utility supply
from an alternative
receptacle.
Overload LED lights up UPS is overloaded.
Please remove some
loads connected at the
output of the UPS till the
RED LED
Is turned off.
PFC
AC/DC
INVERTER
DC/AC
BOOST
DC/DC
CHARGER
BATTERY
Control
Circuit
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