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4.4. Inverter not Functioning
4.4.1. Output Short-Circuit operating in the On-Line Mode
If the output load becomes short-circuited while operating in the On-Line
mode, the UPS will shutdown to prevent damaging the UPS and the
remaining connected equipment. The Fault LED illuminates and the alarm
sounds continuously. The UPS will not turn on automatically after the
short-circuit condition has been removed. The UPS must be manually
restarted. To restart the UPS after the short-circuit condition has been
removed; press the Main Switch on the front panel to the "OFF" position first,
then to the "ON" position.
4.4.2. Output Short-Circuit operating in the Bypass Mode
If the output load becomes short-circuited while operating in the Bypass
mode, the AC fuse will open to prevent damaging the UPS and the
connected equipment. Remove the short-circuited equipment and replace
the AC fuse with same ratings.
4.5. Inverter Over-Temperature
If the UPS experiences an over-temperature when the Utility is normal, the
UPS will switch to the Bypass Mode. The UPS will switch back to the On-
Line mode once the over-temperature condition has been eliminated. If the
over-temperature condition happens when the Utility is abnormal, the alarm
will beep continuously, the Fault LED will illuminate and the output of the
UPS will turn off.
4.6. Inverter Over-Current and Output Voltage Out of Tolerance
If the UPS’s inverter experiences an over-current or an out-of-tolerance
output voltage, when Utility is normal; the UPS will switch to the Bypass
mode and the Utility LED, Bypass LED and Fault LED will illuminate. If the
over-current or the out-of-tolerance output voltage condition happens when
the Utility is abnormal, the Fault LED will illuminate and the output of the
UPS will turn off.
O/P
OUTPUT
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Chapter Five: Maintenance Guide
5.1. System Block
5.2 Troubleshooting
If the UPS malfunctions, check the list below to resolve the problem.
Should the problem persist, call for service.
Situation Check Items Solution
Utility LED is not on and the
UPS is on battery mode,
when Utility is normal.
A
C Input cord is loose
or AC Input fuse is
open.
1.Connect the Input
power cord to the wall
outlet.
2.Replace the AC
input fuse.
3.If the problem
persist call for service.
The UPS switches to the
Battery mode then back to
the On-Line mode, when
the connected device is
turned on. Or, the UPS
switches back and forth
between the Battery mode
and the On-Line mode.
1. Check if any power
strip is connected to
the UPS.
2. Check the wall outlet.
1. Do not use power
strips.
2. Replace the wall
outlet.
The Overload LED is
illuminated.
The UPS is
overloaded. Remove
some of the load.
PFC
AC/DC
INVERTER
DC/AC
BOOST
DC/DC
CHARGER
BATTERY
Control
Circuit