ABB Chapter 11 - Changing IGCTs in DIU
ACS 6000 Maintenance Manual 3BHS202077 ZAB E01 Rev. C 11-3 (6)
3 Take off the clamp head to release the clamp pressure.
Figure 11-2 Clamp Head
The clamp head is fairly heavy and the DIU is not very well accessible
particularly if installed in small CBUs. Due to the narrow space it is
difficult to remove an IGCT while at the same time pushing up the
components located above. Therefore it is recommended to remove
the clamp head to facilitate work.
The clamp disk and the isolators below the disk springs of the clamp
head can also only be removed after the clamp head has been taken
off. If the clamp head is not removed or pushed up far enough the
centering pin below the disk springs will prevent the removal of clamp
disk and isolators.
The fixing bolts (see arrows in
Figure 11-3
) of the clamp bar require
a 24 mm socket.
Figure 11-3 Fastening Bolts
Clamp bar
Disk springs
Centering pin
Clamp disk
Isolators
Clamp head seen
.
This view is not
possible in a line-up.
from the side.
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