Ablerex 3 MS series - 5.3. Input Fuse Burn

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5.3 Input Fuse is burnt
FIG. 5.3
Check Items Trouble-shooting
The IGBT of Inverter Stage is out of order 1.Check the related circuit as shown in fig.5-
4.
Check Q6, Q7, D12, D13, R83 and R104
are defective. If Q6&Q7 are abnormal, the U6 &
U7 need to be replaced, too.
2.Check Q1, U3、BD1 in PFC circuit (fig5-
3).If Q1
is abnormal, replace both U6 and Q1.
3. Check D31-
D34, Q10, Q12, Q15, Q17, Q19,
Q21 and U9, Refer to fig.5-5.
UPS Output Short Circuit or Overload Remove the output load. If the UPS works
Normally, it means the output load connected is
in short circuit or overload.
PFC is abnormal 1.Check the related circuit as shown in fig.5-3.
2.Check if the PFC driving IGBT 20N60(Q1) and
the photo coupler IC PC923( U3) are abnormal.