Manual Operation - S&C AS-1A Instructions For Installation Manual

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MANUAL OPERATION - Continued
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CAUTION
Do not
manually open or close the switch operator
while the Alduti-Rupter Switch is energized.
Operating the switch under reduced operating
speed may cause excessive arcing, resulting in short-
ened interrupter life, or damage to the interrupters.
If switch operator control voltage is not available
and emergency manual opening is absolutely required,
crank the manual operating handle
rapidly
throughout
its full travel.
Do not
stop or hesitate part way.
To avoid closing into a fault, never close the switch
manually.
Step 5
To operate manually: Pull the latch knob on the hub
of the manual operating handle and pivot the handle
forward slightly from its storage position. Release the
latch knob while continuing to pivot the handle forward
to lock it into the cranking position. See Figure 3. (As
the handle is pivoted forward the motor brake is
mechanically released, both leads of the control source
are automatically disconnected, and-except for 12-volt
de models-both the "opening" and "closing" motor
contactors are mechanically blocked in the open
position.)
If
desired, during manual operation, the switch opera-
tor may also be disconnected from the control source by
removing the motor-circuit two-pole pull-out fuseholder,
located on the right-hand inside wall of the enclosure.
To return the manual operating handle to its storage
position, pull the latch knob and pivot the handle approxi-
mately 90 degrees. The handle will then be disengaged
from the switch operator and may be rotated freely in
either direction to its storage position. Complete the
handle storage by pivoting the operating handle backward
approximately 90 degrees until it latches in the storage
position.
Note that the manual operating handle may be disen-
gaged from the switch operator mechanism at any posi-
tion of the handle.
Always padlock the handle in its storage position.
Step 6
To decouple: The integral external selector handle, for
operation of the built-in internal decoupling mechanism,
is located on the right-hand side of the switch operator
enclosure. See Figure 3. Swing the selector handle upright
and slowly rotate it clockwise 50 degrees to the decou-
pled position. See Figure 4. This decouples the switch
operator mechanism from the switch operator output
shaft. Then lower the selector handle to engage the lock-
ing tab. When thus decoupled, the switch operator may be
S&C ELECTRIC COMPANY• Chicago
S&C ELECTRIC CANADA LTD.• Toronto
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operated either manually or electrically without operating
the Alduti-Rupter Switch. When the selector handle is in
the decoupled position, the output shaft is prevented from
moving by a mechanical locking device located within the
switch operator enclosure. During the intermediate seg-
ment of the selector handle travel, which includes the
position at which actual disengagement ( or engagement)
of the internal decoupling mechanism occurs, the motor-
circuit source leads are momentarily disconnected and
(except for 12-volt de models) both the "opening" and
"closing" motor contactors are mechanically blocked in
the open position. Visual inspection, through the observa-
tion window, will verify whether the internal decoupling
mechanism is in the coupled or decoupled position. See
Figure 5. Padlock the selector handle in either position.
Selector handle
(being turned to
decoupled position)
Figure 4. Selector handle operation.
INSTRUCTION SHEET
769-500
Page 9 of 23
April 22, 1996