Install New Thyristor Modules - ABB DCS800 Service Manual

Hide thumbs Also See for DCS800:

Table of Contents

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.

Table of Contents