1ZSE 5492-124 en, Rev. 6 | Maintenance guide UCG 33
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4.5 Mounting the moving main contacts
Fig. 22 shows how to mount the moving main contacts,
and how to place washers and springs. The contacts are
equipped with copper-tungsten tips.
CAUTION
The outer end of the outmost phases should have the
washers with larger diameter, (Ø=25mm) see Fig. 22.
View A – A shows the replacement contact which consist of
two contacts with a mounted spring, mounted on the current
bridge.
Begin with the middle phase. Put the contact and the silver
washers on the shaft and punch the shaft in to the bearing
hole with the 5 mm mandrel. Put the next silver washer and
contact in position and punch in the shaft. Mount washers,
springs and split pins.
Steel washer
Insulating washer
Split pin
Silver
washers
Spring
Contact
Contact
View A - A
Spring
Washer with
larger diameter
Fig. 22. Moving main contacts with tips of copper-tungsten, washers and springs.
Proceed with the outer phases. Put the outermost silver
washer and contact on the shaft and punch the shaft into
the bearing hole. Put the next silver washer and contact into
position and punch in the shaft. Mount washers, springs
and split pins. Check that all containing details are correctly
assembled.
Put a ruler on the linings of the moving main contacts. No
lining should lie more than 1 mm from the ruler.
If any lining does, adjust these contacts closer to the board
by filing off material on the surface of the contact that lies
against the stop shaft.
Carry out the same procedure on the other side of the diverter
switch.
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