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Exchange of Thyristors for Size D7
3ADW000195R0501 DCS800 Service Manual e e
Remove faulty thyristor
1. Remove the screws of all DC / AC - busbars preventing the stack to be prized
open. Remove the branch fuses, if the defective thyristors are covered by
them.
Note:
It depends on the location of the defective thyristors, which DC / AC - busbars
have to be disconnected.
2. Loosen the screws holding the backplate and make sure the backplate can
move up.
Backplate
3. Write down the direction and location of the defective thyristors to be removed
and mark their gate leads.
4. Remove the gate leads if possible.
5. Loosen the mounting clamp at the top of the thyristor stack.
Handling of indicating spring and mounting clamp
screws
backplate
mounting clamp
indicating spring
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