ABB DCS 500B - Remove Faulty Thyristor

Chapter 6 - Exchange of Thyristors for Size A6
VI A 6 - 4 DCS 500 / DCS 600 Service Manual
Remove faulty thyris-
tor
1. Replace all blown fuses and reconnect all fuses taken out du-
ring search for the faulty thyristor.
2. Remove the screws of the DC - busbar plates adjacent to the
defective thyristors.
Figure 6-3 Location of the DC - busbar plates
Note: It depends on the location of the defective thyristor which DC-
busbar plates have to be disconnected.
DC-
busbar
plates
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