12 S&C Instruction Sheet 719-500
Installation
Figure 5� Manual operation of the operating handle�
Using the Manual Operating Handle
The manual operating handle is used during switch operator
adjustment. Become familiar with the operation of the
manual operating handle, as described on the switch
operator nameplate on the right-hand side of the enclosure.
WARNING
Manual closing of an energized circuit-switcher is not
recommended because of the possibility of closing into
a fault� Manual opening of an energized circuit-switcher
is permissible� When the opening operation has been
initiated, however, it should be completed quickly and
without hesitation� Cranking should continue until the
circuit-switcher is fully open, as indicated by resistance
felt as the circuit-switcher power train progresses to its
stops� As the circuit-switcher moves toward the
Open
position, the interrupters will close and the stored-
energy source within the brains will charge and latch�
The circuit-switcher disconnect blades should never
be in the
Closed
position when the interrupters are
in the
Open
position�
Manual closing of the circuit-
switcher may cause arcing, equipment damage,
and personal injury�
STEP 1�
Pull the latch knob on the hub of the manual
operating handle and pivot the handle forward
slightly from its
Storage
position.
STEP 2�
Release the latch knob while continuing to pivot
the handle forward to lock it into the cranking
position. See Figure 2 on page 8 and Figure 5.
(As the handle is pivoted forward and the motor
brake is mechanically released, both leads of
the control source are automatically discon-
nected and both the “opening” and “closing”
motor contactors are mechanically blocked
in the
Open
position. However, the shunt-trip
device, when this option is provided, remains
operative unless the switch operator is in the
Open
position.
STEP 3�
Crank the handle in the direction shown on the
arrow plate for the
Open
position.
If desired, during manual operation the switch
operator 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. See Figure 3
on page 9. Likewise, the shunt-trip device may be
rendered inoperative by removing the shunt-trip
circuit two-pole pull-out fuseholder located on
the left-hand inside wall of the enclosure.
Latch
knob
