ABB Chapter 11 - Changing IGCTs in DIU
ACS 6000 Maintenance Manual 3BHS202077 ZAB E01 Rev. C 11-5 (6)
1 In case the new IGCT is not fitted with a mounting bracket (see
Figure
11-5
) remove this part from the faulty IGCT and mount it on the new
IGCT.
2 Thoroughly clean the contact surfaces of the new semiconductor and
the adjacent components with an appropriate solvent (e.g. alcohol).
Using a fluff-free cloth wipe the surfaces paying attention not to
scratch the surfaces.
Note: Do not use grease or an electrical joint compound.
3 Push the IGCT into place.
The two pins on the cooler must insert properly into the holes of the
mounting bracket of the IGCT (see
Figure 11-5
).
4 Reinstall the components above the IGCT.
5 Adjust the clamping pressure.
Tighten the bolts alternately by one turn at a time until the clamping
pressure is adjusted.
The clamping pressure is properly adjusted if the two indicating
washers are level with the reference ring (see circles in
Figure 11-6
) .
Figure 11-6 Adjusting the Clamping Pressure
6 If a defective part has to be returned to ABB, particularly if it is still
under warranty, follow the procedures as stated in the Warranty
Directive (this is recommended even if the warranty period has
expired).
11.4 Installing an IGCT
Indicating
washer
Reference
ring
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