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Exchange of Thyristors for Size D1 to D4
3ADW000195R0501 DCS800 Service Manual e e
Exchange of Thyristors for Size D1 to D4
Installation of OnBoard bridge and thyristor modules in converters size
D1 to D4
(20...1000 A)
All DCS800 size D1 to D4 are equipped with an OnBoard bridge (excitation) and
thyristor 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 instructions must be observed with particular
care.
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:
mounting torques for the OnBoard bridge and the
thyristor modules to heat sink and electrical
connections see table
Nominal mounting torque for
OnBoard bridge and thyristor modules
on page 35
Screws are metric type; use appropriate nuts
Tissue paper
Solvent (e.g. ethanol)
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 converter from the power supply
completely, then check the voltage free condition and make sure, everything
is located in an electrical and mechanical safe condition!
Find faulty thyristor modules
See
Fault Tracing Thyristors
of this publication.
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: [email protected]