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Exchange thyristors size H7
3ADW000488R0101 DCS880 Service manual e a
9. 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.
10. 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”. Do not tighten the screws any further.
Note:
The correct torque is indicated by means of the welded indicating spring.
11. Perform an OHM test to make sure the thyristor is ok.
12. Reconnect all other dismantled parts.
13. Perform an OHM test between U1, V1, W1 and C1, D1 to make sure the power part is ok.
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