27
Handling the Semiconductors
3ADW000195R0501 DCS800 Service Manual e e
Handling the Semiconductors
General Instruction how to handle the Semiconductors
Thyristor modules, busbars and fuses have to be mounted with the correct torque
using a torque screw driver or torque wrench.
In converters sizes D5 (900 ... 2000 A), D6 (1900 ... 3000 A) and D7 (2050 ... 5200
A) the mounting force is indicated by an indicating spring welded to the mounting
clamp, which is inside the unit.
Always mark suspected damaged components clearly after removing them from
the circuit, to avoid confusion with "good" components.
When removing a damaged semiconductor, write down how and where it was
installed (direction, location, connected gate leads and with BCT’s the position of
the gate connectors).
Check that the new and old components have the same type designation or that
the new component can replace the old one. A semiconductor can be replaced by
different compatible semiconductor according to the codes in the manufacturers'
table.
Semiconductor components are high-precision products. All unnecessary used
tools and objects might damage the easily dented and scratched surfaces of the
semiconductors.
1. Keep new semiconductors as long as possible in their original packages.
2. Use protective gloves if possible.
3. Clean work area and hands frequently.
4. Use good illumination.
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