Ablerex 3 MS series User Manual page 22

4.7 Quick trouble shooting
INVERTER fault
1.replace Q13, Q14,
U7, U8
2.Check R118 R120,
D24 and D25
if the UPS still fails to work. Please refer to the
detail trouble shooting guide
UPS MALFUNCTION
AC fuse is burn
Q12 short
YES
Q13,Q14
short
DC fuse is burn
Q15-Q20
short or low
resistance
YES
NO
NO
YES
NO
22
PFC fault
1. Replace Q12, U6
2. check BD1, D19
and R116
Booster fault.
1. Replace Q15-Q20,
R109, R110, R123,
R124, 132, R138,
U9 and/or F1.
2. CHECK D30-D33
and T2.