ABB DCS800 Service Manual page 56

56
3. Write down the direction and location of the thyristors to be removed and mark
their gate leads. In case of BCT's add the position of the gates.
4. Remove the gate leads if possible.
5. Loosen the mounting clamp at the top of the thyristor stack.
mounting clamp
Handling of indicating spring and mounting clamp
Attention: While loosen the mounting clamp the indicating spring must be pulled
out a little, otherwise the spring will be damaged!
Do not remove the nuts totally, otherwise the treaded rods will fall down!
6. Pull out both DC-busbar plates.
DC-busbar plates
Exchange of Thyristors for Size D6
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
indicating spring
3ADW000195R0501 DCS800 Service Manual e e
DC-
busbar
plates