ABB DCS880 - Connecting PC to the Drive

23
Fault Tracing Thyristors
3ADW000488R0101 DCS880 Service manual e a
11. Measure fuses F100 … F102 using the
OHM function of a normal multimeter and
exchange the broken ones.
12. 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 kΩ).
− A short circuit is indicated by a low
resistance (< 1 kΩ, 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 (F100 … F102)
SDCS-BAB-F0x
To do
Faulty?
Yes
No
Exchange SDCS-PIN-H01
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
.
Exchange the SDCS-PIN-H01 continue with step 9 of the instructions Remove faulty thyristor modules.