Input Fuse Is Burnt - Ablerex 3 MS series User Manual

6.3 Input Fuse is burnt

Check Items
The IGBT of Inverter Stage is out of order
UPS Output Short Circuit or Overload
PFC is abnormal
FIG. 6.3
Trouble-shooting
1. Check the related circuit as shown in fig.6-4.
Check Q29-Q32, D15, D16, R159, R163, R169
and R172 are defective. If Q29-Q32 are
abnormal, the U8 & U9 need to be replaced,
too.
2.Check Q5, U4 ¡BBD1, BD2 in PFC circuit
(fig6-3).If Q5 is abnormal, replace both U4 and
Q5.
3. Check D32-D35, Q12-Q14, Q24, Q27, Q28 and
U7, Refer to fig.6-5.
Remove the output load. If the UPS works
Normally, it means the output load connected is
in short circuit or overload.
1.Check the related circuit as shown in fig.5-3.
2.Check if the PFC driving IGBT 30N60(Q5) and
the photo coupler IC PC923( U4) are abnormal.
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