ABB Chapter 9 - Changing Thyristors in EXU
ACS 6000 Maintenance Manual 3BHS202077 ZAB E01 Rev. C 9-3 (8)
4 Open the bolts completely and remove the broken thyristor together
with the plastic guide.
Figure 9-3 Removing a Thyristor
5 Remove the plastic guide and the gate wires from the broken thyristor.
9.3.2 Treating a New Thyristor before Installation
1 Check the contact surfaces for nicks, scratches, bulges and surface
finish (flatness and roughness).
2 Connect the gate wires and the plastic guide to the new thyristor.
3 Using a nylon sponge, carefully abrade the mating surfaces by
applying circular movements. Take special care not to expose the
copper when abrading. Wipe the abraded semiconductor surfaces
clean with methanol liquid and non-flammable cloth and apply a thin
layer of electrically and heat conducting compound (G 322 L) on the
mating surfaces using a rubber trowel.
9.3.3 Mounting a New Thyristor
1 Push in the semiconductor together with the plastic guide.
Pay attention to the right polarity.
2 Tighten clamp bolts by hand.
3 Using a sliding caliper, verify that the distance between the clamp and
the outer cooling element is equal on both sides (see
Figure 9-4
).
Figure 9-4 Checking the Distances
Plastic guide
Top view!
Top view!
b
a
a = b
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