Chapter 8 - Changing Diodes and IGCTs in 7/9 MVA Phase Modules ABB
8-14 (18) 3BHS202077 ZAB E01 Rev. C ACS 6000 Maintenance Manual
1 Deenergize the drive. See section
8.3 Safety
.
2 Slide the clamp pressure loading gauge under the clamp ring of the
pressure adjusting bolt and remove the bolt to release the clamp
pressure of the stack using the 12 mm ½" hex socket from the tool
box.
Figure 8-18 Pressure Adjusting Bolt
3 Remove the top isolator disc from the stack.
Figure 8-19 Removing Top Isolator Disk
8.5 Replacing Free Wheeling Diodes
Pressure adjusting bolt
Top isolator disk removed
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