34
Exchange of Thyristors for Size D1 to D4
3ADW000195R0501 DCS800 Service Manual e e
Install new thyristor modules
1.
Ensure that the new thyristor module is of the correct type (
see appendix A
of
this manual).
2.
Remove old heat conducting compound (grease) from the heat sink. Clean the
mounting surfaces (heat sink and thyristor module) with an appropriate solvent
(e.g. ethanol) by means of tissue paper. When the heat sink is clean, spread
out the heat conducting compound with a rubber spatula or by hand.
3.
Apply a thin layer of heat conducting compound to the new thyristor module:
Application of heat conducting compound
4.
Spread the heat conducting compound evenly by moving the thyristor module
forward and backward on the heat sink.
5.
Tighten all clamping screws by hand until the screw heads touch the bottom of
the thyristor module. Then tighten the screws to 2.0 Nm torque.
Note:
If the thyristor module is mounted by means of four screws, tighten the screws
crosswise.
6.
Tighten the screws to nominal torque according to table
Nominal mounting
torque for OnBoard bridge and thyristor modules
page 35.
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