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Exchange thyristors size H6
3ADW000488R0101 DCS880 Service manual e a
Exchange thyristors size H6
Installation of thyristor modules in converters size H6 (900 … 2000 A)
All DCS800 converters sizes H6/H7/H8 are equipped with disk type thyristors. The structure of the disc type
semiconductor component is such that it requires a certain compression force to operate. The prevention of
overheating of the component essentially depends on good heat dissipation between the semiconductor and the
conducted heat sink. It is thus important that all joints have good thermal and electrical conduction.
Required tools
Special tools or material needed in addition to standard tools for the exchange of thyristor modules:
− Torque spanner for electrical connections:
25 Nm (M10).
− Screws are metric type; use appropriate nuts.
− 17 mm ring spanner for fuse and busbar
connections.
− 17 mm ring spanner for press clamp.
− Solvent (e.g. ethanol).
− Thermal joint compound (grease):
Manufacturer: Carl Bechem GmbH, 58089 Hagen.
ABB Service: GHSN 390 011 P 0051.
Note:
For more detailed information about the wiring of the power part, see Hardware Manual
.
Therefore strict observance of the build in instructions given below is of utmost importance. Make sure that the
new component can replace the old one in accordance with the spare part list (see Appendix
of this manual).
Semiconductors and heat sinks are to be handled carefully to avoid scratches and other damage. Avoid
touching the contact surfaces. Do not lift the semiconductor with the gate wire. Do not lift the semiconductor by
touching the current contact surfaces. Do not damage the welding flange or the contact surface.
Before the work is started, disconnect the converter completely from the power supply,
then check the voltage free condition and make sure, everything is located in an electrical
and mechanical safe condition!
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