Chapter 8 - Changing Diodes and IGCTs in 7/9 MVA Phase Modules
ABB
8-18 (18)
3BHS202077 ZAB E01 Rev. C
ACS 6000 Maintenance Manual
8
Prepare the components for reassembly.
Check the contact surfaces of the new IGCT, the cooler and the
isolator disk for any dirt. If necessary, clean the contact surfaces 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 any grease or any electrical joint compound.
9
Push the new IGCT into the stack taking care that it slides smoothly
along the guiding rails and that the contact surfaces of the
semiconductor are not scratched.
10
Insert the isolator disk and center it properly.
11
Insert the pressure adjusting bolt by hand taking care that the tip of
the bolt inserts into the centering hole of isolator disk.
12
Adjust the clamp pressure of the stack.
Tighten the pressure adjusting bolt until the clamp pressure loading
gauge is released.
13
Reconnect the fiber optic and the power supply cable.
14
Fasten the gauge in its storage place.
15
Power up the drive and confirm its proper functioning.
16
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).
