25
Fault Tracing Thyristors
3ADW000488R0101 DCS880 Service manual e a
12. Measure fuses F401 … F403 using the
OHM function of a normal multimeter and
exchange the broken ones.
13. The SDCS-BAB-F0x contains a 3-phase half-controlled bridge (B6H).
Using the OHM function of a normal multimeter, measurements must be made from each AC terminal to
each field exciter terminal (U1* to F+, V1* to F+, W1* to F+, U1* to F-, V1* to F- and W1* to F-).
−
Normally, each measurement
should show high resistance (> 1
k
Ω
).
−
A short circuit is indicated by a low
resistance (< 1 k
Ω
, destroyed
thyristor or diode).
−
If one of the measurements shows
a short circuit, replace the
SDCS-BAB-F0x.
−
A measurement, showing less resistance than 1
Ω
should be made for a second time. Apply the
test leads with opposite polarity; if this measurement shows the same result, the SDCS-BAB-F0x is
faulty and needs to be replaced.
−
After the SDCS-BAB-F0x is replaced, the above mentioned measurement should be done another
time to make sure that all is fine.
Fuses (F401 … F403) SDCS-BAB-F0x
To do
Faulty?
Yes
No
Exchange fuses
No
Yes
Exchange SDCS-BAB-F0x
Yes
Yes
Exchange SDCS-BAB-F0x and fuses
Exchange the SDCS-BAB-F0x continue with chapter
Remove faulty SDCS-BAB-F0x
.
Содержание DCS880 series
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Страница 46: ...46 Exchange thyristors size H6 3ADW000488R0101 DCS880 Service manual e a Location of branch fuses frame H6 ...
Страница 58: ...58 Exchange thyristors size H7 3ADW000488R0101 DCS880 Service manual e a Location of branch fuses frame H7 ...
Страница 127: ...127 Appendix Spare Parts List 3ADW000488R0101 DCS880 Service manual e a Appendix Spare Parts List ...