Chapter 9 - Changing Thyristors in EXU
ABB
9-2 (8)
3BHS202077 ZAB E01 Rev. C
ACS 6000 Maintenance Manual
Figure 9-1
3-phase AC Power Controller
9.3.1
Preparatory Steps
1
Check that the drive has been deenergized and voltages have been
removed from the cabinet. See section
9.2 Safety.
2
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 9-2). At first, do not open the bolts
completely to prevent the clamp from dropping.
Figure 9-2 Loosening the Bolts
9.3
Replacing Thyristors in EXUs for Brushless Excitation
Clamp
