48
Exchange of Thyristors for Size D5
3ADW000195R0501 DCS800 Service Manual e e
7. Tighten the nuts of the mounting clamp by hand so that the clamp is in parallel
with the contact surface of the heat sinks.
Note:
The indicating spring is a very sensitive instrument and must be handled with
care.
8. Tighten each nut in turn, half a turn at a time with the help of a ring spanner
until the indicating spring clicks into position “correct torque” (see fig. Aluminum
spring with welded indicating spring
on page 47). Do not tighten the screws any
further.
Note:
The correct torque is indicated by means of the welded indicating spring.
9. Perform an OHM test to make sure the thyristor is ok.
10. Reconnect the DC – busbars, branch fuses and all other dismantled parts.
11. Perform an OHM test between U1, V1, W1 and C1, D1 to make sure the power
part is ok.
U1 V1 W1
V24 V11
V13 V26
V22 V15
V14 V21
V23 V16
V12 V25
left stack
rear front
right stack
front rear
View from the left Front view View from the right
Location of thyristors in frame D5 (4-Q bridge)
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