ABB DCT880 - Installing New Semiconductor Fuses; Ensure correct fuse type and perform tests; Reinstall busbars and reconnect components

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Install new semiconductor fuse(s)
1. Ensure that the new semiconductor fuse(s) are of the correct type (see Appendix A of this manual).
2. Reinstall the new semiconductor fuse(s).
3. Perform an OHM test to make sure the semiconductor fuse(s) are ok.
4. Reinstall the busbars. Make sure, the correct torque is applied according to table
Nominal mounting
torque for T5 thyristor modules.
5. Reinstall the plastic cover and the SDCS-PIN-H board.
6. Reconnect all cables and plugs at the SDCS-PIN-H:
− Auxiliary voltage input (X99).
− External measurement channels (X54, X60, X65).
− Voltage measurement (X51, X52, X53 and X55, X56, X57).
− Snubber resistor (X30, X31).
− Gate leads (X15, X17).
− Temperature sensor (X22).
− Current transformers (X3, X4, X5).
7. Reconnect the flat cables at the SDCS-CON-H (X14, XC12, XS13), the cable at X38 and re-hinge the
electronic tray.
8. Reconnect the grounding / holding screws at the electronic tray.
9. Reconnect all I/O plugs at the SDCS-CON-H.
10. Reinstall all plug in options (do not forget the screws), the design cover and the control panel.
Service
3ADW000449R0101 DCT880 Service Manual e a