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36
Installation
01.4IB.77020
PowlVac-ND
®
and PowlVac-NDA
™
Series 4
Vacuum Circuit Breakers
b. Turning the racking handle clockwise
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 low at the beginning of
motion as the movement of the racking
crank arms is only opening the shutters.
Once the shutters are open, the circuit
breaker begins to move toward the
stationary primary disconnecting
devices. When the movable 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
“
CONN
” as observed through the
compartment door view window. This
will be approximately 22 rotations
from the starting point. When the
circuit breaker reaches the end of
the racking travel, the operator will
notice an increased amount of force.
If the user continues to apply force, a
torque limiter on the racking handle
will produce an audible clicking sound
indicating the torque limit is reached at
35 ft•lb. 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.
c. Once the circuit breaker has reached the
connected position remove the racking
handle, and operate the circuit breaker
as required.
Note:
This is the Connected Position.
4) Removing the Circuit Breaker from the
Connected to the Test/Disconnected Position
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
a. Verify that the circuit breaker
open/closed indicator displays
“
BREAKER OPEN
” and if not, operate
the circuit breaker control switch to
open the circuit breaker.
b. Place the racking handle socket onto
the racking drive shaft extension.
c. Turn the racking handle
counterclockwise until the breaker
position indicator displays “
TEST
”.
d. Remove the racking handle. This
is approximately 22 turns from the
“
CONN
” position.
Note:
This is the Test Position.
