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
