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Handling the Semiconductors
3ADW000488R0101 DCS880 Service manual e a
Handling the Semiconductors
General Instruction how to handle semiconductors
Thyristor modules in converters sizes H1 … H5 (20 … 1190 A), busbars and fuses have to be mounted with the
correct torque using a torque screw driver or torque wrench.
In converters sizes H6 (900 ... 2000 A), H7 (1900 ... 3000 A) and H8 (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.
