Ablerex 3 MS series - 4.3. Input Fuse Burn

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4.3. Input Fuse is burnt
FIG. 4.3
Check Items Trouble-shooting
The IGBT of Inverter Stage is out of order 1. Check the related circuit as shown in fig.4-4.
Check Q14, Q13, D24, D25, R118 and R120
are defective. If Q14、
Q13 is abnormal, U7,U8
need to be replaced, too.
2. Check Q12, U6、BD1 in PFC circuit (fig4-3).
If Q12 is abnormal, replace both U6 and Q12.
3. Check D30-D33, Q15-Q20 and U9, refer to
fig.4-5.
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.4-3.
2.
Check if the PFC driving IGBT 20N60(Q12) and
the photo coupler IC PC923( U
6) are abnormal.