Chapter 11 - Changing IGCTs in DIU ABB
11-2 (6) 3BHS202077 ZAB E01 Rev. C ACS 6000 Maintenance Manual
The DIU is located in the bottom left corner of a CBU. The CBU is available
in two different sizes depending on the power rating of the converter (size
1 for converters up to 9 MVA and size 2 for converters rated for 9 to 14
MVA).
The replacement of IGCTs is explained using the example of size 1 of the
CBU. Although the space in this type of CBU is very narrow the IGCTs can
be replaced from the front of the cabinet.
1 Check that the drive has been deenergized and voltages have been
removed from the cabinet. See section
11.2 Safety
.
2 Disconnect the fiber optic cable (see
Figure 11-1
) and the power
supply lead (not shown in
Figure 11-1
) of the IGCT to be replaced.
Figure 11-1 Front View of DIU
11.3 Removing an IGCT
Clamp bar
Isolators
IGCTs
Fiber optic cable
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