Ablerex 3 MS series - Page 17

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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 4-2.
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 conrtrol IC U2 or the Booster control IC U9 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 U5(HA17393) of the driver board is sending
out a square wave of Utility frequency.
4.2.2.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 Heat Sink 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.