ABB DCT880 - Exchanging Internal Semiconductor Fuses (T5); Required tools for fuse exchange (T5); Safety warning before fuse exchange (T5); Finding blown semiconductor fuses (T5)

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Exchange of internal semiconductor fuses in thyristor power controllers
size T5 (890 A … 960 A)
All DCT880 size T5 are equipped with internal semiconductor fuses.
Required tools
Special tools or material needed in addition to standard tools for the exchange of thyristor modules:
− Torx screwdrivers:
TX10, TX20, TX25
− Torque spanner for electrical
connections:
13 Nm (M8)
25 Nm (M10)
50 Nm (M12)
− Screws are metric type; use
appropriate nuts.
Before the work is started, disconnect the thyristor power controller completely from
the power supply, then check the voltage free condition and make sure, everything is
located in an electrical and mechanical safe condition!
Find blown semiconductor fuses
Using the OHM function of a normal multimeter, measurements must be made from both sides of the
semiconductor fuses.
Remove blown semiconductor fuses
1. Remove control panel and design cover.
Service
3ADW000449R0101 DCT880 Service Manual e a