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6.2.1. Troubleshooting
Check Items Trouble-shooting
Output Short Circuit Check if the output end of the UPS is in short
circuit.
Overload(>120%)
Reduce the output load to 3000VA/2100W
Battery voltage is abnormal 1. If the battery voltage is under 78V, replace
the batteries。
2. Remove the battery, and check the charge
voltage. if the voltage is over 115V, the
charger circuit is out of order. Refer to fig6.1,
nearby.
INVERTER Voltage ERROR Refer to fig.6-4, Check U8, U9, Q29, Q30, Q31,
Q32。
The Fan on the rear panel is out of order 1.Check to see if the connection to the fan is
Properly done.
2.Connect 12Vdc t o the Fan(red line to positive)
to check if the fan is normal.
3.Otherwise, please check the related circuit as
fig 6-2.
Environmental Temperature is out of windows(
Over 40 degree C)
Improve the ventilation and reduce the temperature
of the environment.
BUS Voltage abnormal The PFC control IC U2 or the Booster control IC
U7 may be abnormal.
The feedback signal to CPU is abnormal. 1.Check if the connection between the control
Board and the driver board is properly done.
2.Check if pin1 of U1(HA17393) of the driver
board is sending out a square wave of Utility
frequency.
6.2.2.Fault Status Analysis
When the Fault LED lights up, you may know which part of the UPS is out of order by
Pushing the Test Switch in front.
Utility Inverter Battery Low Overload Symptom
0 0 0 1 Short Circuit
0 0 1 0 Inverter Over-current
0 0 1 1 Battery Voltage Abnormal
0 1 0 0 Inverter Voltage Abnormal
0 1 0 1 Heatsink Overheat
0 1 1 0 DC Bus Fault
p.s. A code composed by Utility, Inverter, Battery Low and Overload LEDs may indicate the possible
fault conditions by pushing the Test Switch button in front.
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