ABB DCS800 Service Manual page 71

Mounting clamp; correct torque
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 backplate, branch fuses, DC- / AC-busbars 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.
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3ADW000195R0501 DCS800 Service Manual e e
Torque indicating spring
correct torque
Exchange of Thyristors for Size D7
71