S&C AS-1A Instructions For Installation Manual page 18

S&C Switch Operators - Type AS-1 A
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INSPECTION SCHEDULE AND PROCEDURES
To assure continued proper performance of the 1.ype
AS- lA Switch Operator, it should be inspected every
5 years. De-energize the associated Alduti-Rupter
Switch and perform the following switch operator
inspection procedures:
1.
Check for evidence of water ingress, damage, and
excessive corrosion or wear.
2. Check ease of operation during slow, manual cranking
using the switch operator manual operating handle.
3. Check electrical operation, coupled and decoupled.
4. Check for loose wiring inside enclosure and proper
functioning of position-indicating lamps, operation
counter, convenience lamp, etc.
5. Check operation of brake and readjust if necessary.
The procedure for doing this is as follows. See Fig-
ure 9.
(a) Place the selector handle in the decoupled
position.
(b)
Remove the two-pole pull-out fuseholders for the
motor circuit and space-heater circuit.
( c) Disconnect the linkage rod by removing the
¼"-20xl¼" hex-head screw, lockwasher, flat
washer, and spacer-bushing from the end of the
brake lever, as shown in Detail
A.
Be careful not to
lose these parts. Then raise the brake lever and
measure the vertical free play, as shown in Detail B.
This dimension should be %" to ¾''. Should the
measurement be outside this range, brake-wear
compensation is required; proceed to Step ( d). If
the measurement is within this range, reattach the
linkage rod and tighten the ¼"-20 xl¼" hex-head
screw securely; proceed to Step (i).
(d) Remove the four
5 /1s
11
-18xl1/4'' screws used to
attach the motor, withdraw the motor, and care-
fully rest its shaft on the floor of the enclosure. Be
careful not to lose the square key or tubular spacer
(if
furnished), which may remain on the motor
shaft. Note: 115-volt ac and 230-volt ac motors
utilize a ¼"-20 socket-head set screw on the side
of the brake disc hub, as shown in Detail C. Loosen
this set screw approximately one-half turn, using a
1/s" Allen wrench, before removing the motor.
769•500
INSTRUCTION SHEET
Page 18 of 23
April 22, 1996
i
(e) Using a %2
11
Allen wrench, loosen the pad assem-
bly socket-head set screw on the side of the cali-
per assembly approximately one-half turn. See
Detail
A.
(f)
Then, using a o/16
11
Allen wrench, rotate the pad
assembly clockwise until the free play at the end of
the brake lever is %
11
to
¾",
as shown in Detail B.
Now tighten the %2" pad assembly socket-head set
screw.
(g) Insert the spacer-bushing through the angle bracket
and brake lever, and reattach the linkage rod using
the ¼"-20xl¼" hex-head screw, lockwasher, and
flat washer. Tighten the screw securely.
(h) Insert the square key in the keyway, as shown in
Detail A. Slip the tubular spacer (if furnished) over
the motor shaft and reinstall the motor. Position
the motor such that the two weep holes on the side
of the housing face downward. Replace the four
o/1s"
-18 x 1
¼"
screws used to attach the motor and
tighten them securely. On 115-volt ac and 230-volt
ac motors, further, retighten the ¼"-20 socket-
head set screw on the side of the brake disc hub.
(i) Check the operation of the brake linkage as
follows: Pull the latch knob on the hub of the
manual operating handle and
slowly
pivot the
handle forward from its storage position toward
its cranking position until the brake disc can be
rotated by hand. Be careful not to get grease on
the brake disc. Now measure the distance that the
end of the brake lever travels from the point of
initial brake release to the bottom of its stroke
(which occurs when the handle locks into the
cranking position). This dimension should be 1/s"
to
¼".
See Detail D. Should the measurement be
outside this range, refer to the nearest S&C Sales
Office.
Since the Type AS-lA Switch Operator may be conve-
niently decoupled from the Alduti-Rupter Switch, elective
exercising of the operator may be performed at any time
without requiring an outage or switching to an alternate
source.
S&C ELECTRIC COMPANY. Chicago
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S&C ELECTRIC CANADA L TO.• Toronto