I.B. 32-255-1G
Page 21
Effective 12/02
Positive Interlock
The positive interlock prevents the levering-in crank
from being engaged if the circuit breaker is closed in the
CONNECTED position.
Negative Interlock
The negative interlock prevents the circuit breaker from
closing between the CONNECTED and TEST positions.
Position Closing Interlock
The circuit breaker is prevented from closing automati-
cally when it is moved from the TEST to the CONNECT-
ED position if the closing switch is maintained during the
levering-in operation.
Position Withdrawal Interlock
This interlock prevents the circuit breaker from being
withdrawn by pulling unless it is in the TEST position.
Extension Rail Interlock
The extension rail interlock prevents the circuit breaker
from being withdrawn out of its compartment unless the
extension rails are properly engaged to the fixed rails.
The correct operation of provided interlocks should be
confirmed. Keep in mind that an interfacing check is
made with a compatible structure. As such, the instruc-
tions provided here may overlap with the instructions
provided with the assembly. In any case, all provided
interlocks should be confirmed. Review paragraph 4-8.1
before proceeding if additional instructions are needed
on insertion and removal of a circuit breaker.
At the conclusion of the operations check as described
in paragraph 4-8.2, the circuit breaker was closed in the
TEST position with its springs charged. Engage the lev-
ering-in crank. The circuit breaker will automatically trip
and MOC switches will operate if the circuit breaker
compartment is equipped with MOC switches designed
to operate in the TEST position.
Lever the circuit breaker towards the CONNECTED
position. As the circuit breaker moves, protective com-
partment shutters will automatically begin to open
uncovering fixed primary contacts. TOC switches will
also operate once the CONNECTED position is
reached, if TOC switches are provided in the structure.
Remove the levering-in crank at this point.
Close the circuit breaker. Any provided MOC switches
will operate and the motor closing springs will charge if
control power is available.
Attempt to engage the levering crank. The slider cannot
be pushed far enough to engage the levering-in crank.
Trip the circuit breaker, engage the levering-in crank,
and lever the circuit breaker out approximately halfway
towards the TEST position.
Attempt to lift the circuit breaker lift/pull handle to pull
the circuit breaker out. The position withdrawal interlock
will prevent lifting the handle high enough to disengage
the levering latch from the nut. This prevents the circuit
breaker from being pulled out.
Attempt to close the circuit breaker by pushing the man-
ual close button. The circuit breaker will go trip free
(springs discharge but circuit breaker will not close).
Lever the circuit breaker to the TEST position. The sec-
ondary contacts will disengage automatically.
Engage the secondary contacts by pulling them forward
as far as possible. Close the circuit breaker. The motor
will start charging the springs automatically.
Remove the extension rails. Disengage the levering latch
by lifting the handle on the circuit breaker and attempt to
pull the circuit breaker out. The circuit breaker will not
move out more than two inches beyond the TEST posi-
tion. Push the circuit breaker back to the TEST position.
Engage the extension rails. Once again disengage the
levering latch and pull the circuit breaker out. The circuit
breaker will trip, close and trip as it comes out on to the
extension rails from the TEST position.
The interface checks outlined in this manual and the
manual provided with the assembly structure are
intended to verify safe and proper operation. If
observed conditions are not as described, contact
Cutler-Hammer for assistance.
NOTICE
Summary of Contents for 50VCPW-ND250
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