IB 6.2.7.7-3
8
the
Rack Screw and rotate crank
counterclockwise until a definite resistance is
felt (Do Not Force).
NOTE: If the Index Lever is observed (and/or
heard, by a "click" sound) to instead engage in
one of the holes of the Rack Screw, causing the
Release Lever to turn back to the right, the
Racking Mechanism is still not in the
WITHDRAW position. Step 2 must be repeated.
NOTE: If the Closing Springs were previously
charged, they will automatically discharge when
the Racking Mechanism reaches the
WITHDRAW position.
3. Engage the Fifth Wheel accessory into the
Hole Guide in the breaker’s truck. See Figure
A1 in the Appendix. Push the circuit breaker
into the switchgear compartment until a
definite stop is felt. This stop is the rollers of
the breaker’s Racking Arms hitting the back
edge of the Racking Ports of the
compartment.
4. Turn the Release Lever to the left, engage
Racking Crank into the Rack Screw, and
rotate Crank clockwise until racking
mechanism automatically stops at the
DISCONNECT position. The breaker is now
held captive in the compartment by the rollers
of the Racking Arms and the Racking Ports of
the compartment.
5. To rack the circuit breaker to TEST position,
turn the Release Lever to the left, turn Crank
clockwise one-quarter (¼) turn, and then
release the Release Lever. It will remain in
the
released
position. Continue cranking
clockwise until the racking mechanism
automatically stops at the TEST position.
6. With the circuit breaker now in the TEST
position, turn the Motor Disconnect Switch to
the ON position to electrically charge the
Closing Springs. If a Motor Disconnect Switch
was not provided, the Closing Springs will
automatically charge when the breaker
approaches the TEST position.
Check for proper operation by closing and
opening (tripping) the circuit breaker both
electrically and mechanically. This includes
control switches, relays, etc.
WARNING
For safety, when racking the circuit breaker "to" or
"from" the CONNECT position, the compartment
door must be closed, and the racking crank
inserted through the opening provided in the
compartment door.
7. To rack circuit breaker to the CONNECT
position, close the compartment door, and
reinsert the crank into the Racking Screw via
the Access Door in the compartment door.
See Figure A8.
8. Turn the Release Lever to the left, rotate Crank
clockwise one-quarter (¼) turn, and then
release the Release Lever. It will remain in the
released
position. Continue cranking clockwise
until the Racking Mechanism automatically
stops at the CONNECT position.
CAUTION
Do not attempt to rack circuit breaker any further,
damage to the racking mechanism may result.
CIRCUIT BREAKER REMOVAL
(MODEL 21)
Removal From CONNECT Position
WARNING
For safety, when racking the circuit breaker "to" or
"from" the CONNECT position, the compartment
door must be closed, and the racking crank
inserted through the opening provided in the
compartment door.
1. Open Access Door in the front compartment
door, and engage Racking Crank into the
Rack Screw. See Figure A8.
2. Turn the Release Lever
to the left, rotate the
Crank counterclockwise one-quarter (¼) turn,
and then release the Release Lever. It will
remain in the
released
position. Continue
rotating the crank counterclockwise until the
Racking Mechanism automatically stops at the
TEST position.