Siemens-Allis FC-10008, Instructions Manual

Page: 43 / 80

BREAKER OPEN
---- DIRECTION OF ADJUSTMENT
TRA NSFER TIP AND BACK OF
STATIONARY CONTACT ALIGNED
8
SCREW
Fig'!re
1 1 E.
dimensions "C" (totalized) within tolerance. Repeat on
each phase if necessary . After reaching correct engagement,
make certain that checknut (10) and locknut ( 12) are
tightened securely.
PROCEDURE B Contact Lead
1. Each movable contact structure
is
to be checked
separately for contact lead. Remove pin (23, Figure llA)
from each of three phases. This frees the individual phases
for independent checks and adjustment. Raise each phases
movable contact until the arcing contact just touches. Refer
to Figure llA and measure .
1.1 Shortest gap between main and stationary
contacts, dimension "b". This measurement should be
0.375 to .281 inches (9.5-7 .1
mm).
1.2 Shortest gap between tertiary contacts, di·
mension
"a".
This measurement should be 0.156 to .125
inches ( 4.0-3.2 mm).
2. If di
me nsions "a" and "b"
are
incorrect, remove
one roll pin from each p l a te (10) and loosen eight screws
(22, l'lgure llC). Insert a spacer as thick as dimension "a"
between
the tertiary
contacts, and apply a C-clamp bearing
·
o n rear of block (8, Figure llC) and front movable contact
(3, Figure llB). Adjust clamp to dimension "b". With
contacts held in this position move two plates (10, Figure
llC) back
so
that pins ( 1 6 )
are
touching l e a di n g end of
plate slots. Tighten eight screws (22),
drill and
insert pin to
·20·
retain adjustment. Remove spacer, clamp and reconnect
contact link
( 4 7, Figure llA).
NOTE
Do not attempt to obtain simultaneous touch
of arcing contacts on all 3 phases as it is not
required.
TRANSFER TIP ADJUSTMENT
Transfer tip adjustment ( Figures llD and llE) is
required
if any
of the following is performed.
a.
Transfer tip (1) is disturbed or removed (replaced)
from its present position on spacer block (2) .
b. Contact ':lea.etration is adjusted.
c. Movable contact (4) is replaced.
Transfer tip adjustment is necessary to prevent the
tip
of
movable contact (4) from hitting the transfer t i p
(1) when closing the breaker if there is interference:
1. With the breaker open, loosen screws (6 and 7) and
slide the transfer tip (1) along its slotted holes
all
the way to
the back away from the stationary contact (5).
2. Close the breaker.
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