ABB
Chapter 8 - Changing Diodes and IGCTs in 7/9 MVA Phase Modules
ACS 6000 Maintenance Manual
3BHS202077 ZAB E01 Rev. C
8-17 (18)
3
Disconnect the fiber optic cable and the power supply lead of the
IGCT to be replaced.
4
Loosen all hexagon fastening bolts of the IGCTs (see arrows in
Figure
8-21) and remove the two retaining rods.
5
Extract the top isolator disk.
6
Lift the cooler above the faulty IGCT and extract the faulty IGCT.
The cooler above the upper IGCT can be lifted up by hand.
When extracting a lower IGCT it is recommended to use the spreader
tool.
Figure 8-22
Using the Spreader Tool
7
In case the new IGCT is not fitted with retaining clamps and guides
(see
Figure 8-23) remove these parts from the faulty IGCT and mount
them on the new IGCT.
Figure 8-23
IGCT
Guides
Retaining clamps
