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35
Installation
01.4IB.65131
d. Once the circuit breaker has reached
the connected position, remove the
racking handle, visually verify that the
emergency racking drive shaft shutter
has returned to its normal position,
close the compartment door, and
operate the circuit breaker as required.
Note: This is the Connected Position.
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Prior to removing the circuit breaker from the
circuit breaker compartment, make sure that
the control circuits are deenergized.
!
CAUTION
Prior to removing the circuit breaker from the
circuit breaker compartment, make sure the
circuit breaker is in the open position and all
springs are discharged.
!
CAUTION
1) Removing the Circuit Breaker from the
Connected to the Test/Disconnected Position
The preferred method of racking the
ARM Series 4 circuit breaker is electrically
from a remote location via Sentry remote
controller installed in the switchgear. Refer
to the instruction bulletin provided with the
controller for detailed information on the
automatic racking procedures.
NOTICE
c. Turning the racking handle
counterclockwise
will begin to rack the
circuit breaker into the compartment.
When the circuit breaker is racked into
the compartment, the force needed
to rotate the racking handle will be
high at the beginning of motion due to
the force required to start the racking
drive of the motor. As the movement
of the gears start the force will reduce.
Once the shutters are open, the circuit
breaker begins to move toward the
stationary primary disconnecting
devices. When the moveable primary
disconnecting devices of the circuit
breaker engage with the stationary
primary disconnecting devices of the
compartment, the force required to
rotate the racking handle will increase
appreciably. This force will decrease
as the primary disconnecting devices
spread and engage fully. Continuing
rotation of the racking handle will cause
the circuit breaker to travel further into
the compartment ensuring wipe or
overlap of the primary disconnecting
devices. Continue racking until the
breaker position indicator displays
“BREAKER CONNECTED”. When the
circuit breaker reaches the end of the
racking travel, the operator will notice
an increased amount of force. If the
operator continues to apply force, a
torque limiter on the racking handle
will produce a sharp clicking sound
indicating the torque limit is reached at
35-ft-lbs. Should the operator continue
to apply force, the torque limiter will
continue to operate with no further
buildup of torque on the circuit breaker
racking mechanism.
