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and the primary blade buffer stop (1) Fig. 1.
3/16" to 1/4
between the edge of the primary blade and the front of
11
the primary contact support.
Adjust the length of the rod by use of the adjusting nuts
to obtain the 3/1611 to 1/4" gap then adjust the buffer
adding or removing shims to get the 1/64" to 1/32" clearance.
The primary gap should be measured with the primary blades in the normal
position.
A measurement should be made from the buffer stop or spacer
(3) Fig. 9 to the primary finger (2) .
bottom finger, should be used on both 600A and 1200A switches.
dimension should be 11
correct, the lower buffer stop
lar manner to the adjustment on the upper stop.
from the top to the bottom of the stop (or the reverse
Adjust the stops at both ends of the main shaft the same amount to keep
them balanced.
Close the primary blades (12) Fig. 8 slowly by the use of the m ainte
nance handle and note the engagement of the primary contacts (4) , arc
(
ing contacts
6
around the guide block without bearing heavily on either side.
should also be centered in the primary and arcing contact fingers.
If the blades press hard against the sides of the guide block, loosen
the {2) bolts (11) Fig. 8 holding the block.
alignment.
If the contacts are properly aligned, reposition the guide
block and bolt securely.
If the contacts are not in alignment, loosen the bolts holding the
top insulator and position the insulator to center the contacts.
After securing the insulators, reposition the guide blocks and tighten
the bolts.
Be certain the insulator is moved only in a horizontal direction.
Vertical displacement may cause misalignment of the auxiliary blade
contacts.
Arc Chute Alignment
The arc chute must be positioned to allow entry of the auxiliary blade;
to latch, and finally, to release the auxiliary blade at the proper
time.
With the operating springs blocked, turn the contact arm (12) Fig. 7
slowly closed and check the entry of the auxiliary blade (7) into the
arc chute (1) .
The blade should enter smoothly and be in the center
of the opening.
chute, loosen the (2) bolts at the top (2) Fig. 7 and the (2) bolts
plus or minus 3/8".
rr
(
6
8) , and guide block (10) .
&
If the blade scrapes heavily on the sides of the
Ther� should also be
The same primary finger, the
If this dimension is not
)
5
Fig.
should be adjusted in a simi
Move shims and washers
The blades should center
Again check the contact
GEI-88767
(
)
6
Fig. 6
(8)
Fig. 7 by
The
)
as required.
They
7
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