Chapter 5 - Exchange of Thyristors for Size A5
DCS 500 / DCS 600 Service Manual
VI A
5 - 1
Installation of "Disc
Type" thyristor in con-
verters size A5
(900...2000 A)
All DCS 500B and DCS 600 converters sizes A5/A6/A7/C3/C4 are
equipped with disk type thyristors. The structure of the "Disc type"
semiconductor component is such that it requires a certain com-
pression force to operate. The prevention of overheating of the
component essentially depends on a well 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:
13 Nm (M8)
25
Nm
(M10)
50
Nm
(M12)
- Screws are metric type; use appropriate nuts.
- 17 mm ring spanner for fuse and busbar connections.
- 17 mm ring spanner for press clamp.
- Tissue paper / solvent (e.g. ethanol).
- Thermal joint compound:
type
BECHEM-RHUS SU 2
(grease)
Manufacturer:
Carl Bechem GmbH, 58089 Hagen
ABB Service:
GHSN 390 001 P 0001
- Disassembly tool
3ADT 621 023 P1
Note:
For more detailed information about the wiring of
the power part, see manual
Technical Data
.
Therefore strict observance of the build in instructions given below
is of utmost importance. Make sure that the new component can re-
place the old one in accordance with the spare part list (
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 semi-
conductor by touching the current contact surfaces. Do not damage
the welding flange or the contact surface.
Before you start work, disconnect the converter
completly from the power supply then check the
voltage free condition and make sure, everything
is located in an electrically and mechanically safe
condition!
3ADW000093R0701_DCS500B/DCS600_Service manual_e_g
