18
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( U6) are abnormal.
Содержание 3 MS series
Страница 7: ...7 1 2 3 4 5 6 7 8 9 Pin 6 RS232 Rx Pin 9 RS232 Tx Pin 7 Ground...
Страница 24: ...24 5 2 Fault LED Lights up and No Output FIG 5 2...
Страница 32: ...32 6 2 Fault LED Lights up and No Output FIG 6 2...
Страница 39: ...39 Appendix a 1 Wiring Diagram a 1 1 For MS 1K...
Страница 41: ...41 a 1 3 For MS3K...
Страница 42: ...42 a 2 Placements a 2 1 For MS1K 220V...
Страница 43: ...43 a 2 2 For MS2K 220V a 2 3 For MS3K...
Страница 44: ...44 a 2 3 For MS3K 220V...
Страница 45: ...45 a 2 4 For MS1K 120V...
Страница 46: ...46 a 2 5 For MS2K 120V...
Страница 47: ...47 a 2 6For MS3K 120V file smenu_ms doc...
