Chapter 4 - Exchange of Thyristors for Sizes C1/C2/C2b
DCS 500 / DCS 600 Service Manual VI A 4 - 1
Installation of thyristor
modules in converters
size C1/C2/C2b
(25...1000 A)
All DCS 500B and DCS 600 size C1/C2/C2b are equipped with thy-
ristor modules.
In order to keep the operating temperature of the semiconductor
module low, the joint between the heat sink and the module should
have a good heat conducting ability. The electrical conductivity of
the connectors must also be good. For this reason the following in-
structions must be observed with particular care.
Required Tools
Special tools or material needed in addition to standard tools for the
exchange of thyristor modules:
- torque spanner: mounting torques for thyristor
module to heat sink and elelectrical
connections see table “Nominal
mounting torques for thyristor
modules” in this chapter;
- screws are metric type; use appropriate nuts
- tissue paper / solvent
- thermal joint compound: type BERULUB FZ1 E3
(grease)
Manufacturer: Carl Bechem GmbH, 58089 Hagen
ABB Service: GHSN 390 011 P 0051
or
- thermal joint compound: type WLPF 20 (10 ml)
ABB Service: GHSN 390 011 P 10
Before the work is started, disconnect the con-
verter from the power supply completely, then
check the voltage free condition and make sure,
everythingis located in an electrical and mechani-
cal safe condition!
Remove faulty thyris-
tor modules
- Tilt out the electronics casing.
- Remove the gate leads from the faulty thyristor module and
mark the position of the trigger connections on the cable.
- Remove only as many parts as is needed around the faulty
module. If the current transformer must be removed, mark the
position and the connections!
- Remove the faulty thyristor module and mark it.
3ADW000093R0701_DCS500B/DCS600_Service manual_e_g
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