Input Fuse Is Burnt - Ablerex 3 MS series User Manual

5.3 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. 5.3
Trouble-shooting
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¡B 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.
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 20N60(Q1) and
the photo coupler IC PC923( U3) are abnormal.
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