ABB Chapter 3 - Changing Diodes and Thyristors in LSU
ACS 6000 Maintenance Manual 3BHS202077 ZAB E01 Rev. C 3-3 (6)
The replacement of diodes and thyristors is explained using the example
of a 9 MVA LSU.
Note: When replacing diodes or thyristors of the rectifier, the clamping
pressure of the stack must be released. Do not to release the pressure all
at once, as otherwise all semiconductors in the stack will become
misaligned. They must then be recentered in a time consuming procedure.
The misalignment results from the flexible busbar connectors at the rear
of the stack, which push the coolers to which they are connected to the
front, thus misaligning the semiconductors. It is therefore highly
recommended that the instructions below are followed.
Figure 3-2 LSU Rectifier
3.3 Replacing Diodes and Thyristors
A Pressure adjusting bolts
B Pressure loading spanner
C Spreader tool
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