ABB Chapter 9 - Changing Thyristors in EXU
ACS 6000 Maintenance Manual 3BHS202077 ZAB E01 Rev. C 9-5 (8)
Figure 9-6 6-pulse Thyristor Rectifier
9.4.1 Preparatory Steps
1 Deenergize the drive. See section
9.2 Safety
.
2 Remove the fuse and the fuse support in order to be able to remove
the thyristor (see
Figure 9-8
). Cut off the cable tie securing the
thyristor gate wires and remove them from the pulse transformer.
3 Loosen the clamp bolts alternately until they can be turned by hand
and loosen the thyristor (see
Figure 9-7
). To prevent the clamp from
dropping, do not open the bolts completely.
Figure 9-7 Loosening the Bolts
9.4 Replacing Thyristors in EXUs for Direct Excitation
Clamp
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