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Page 20

I.B. 3A74792H08

Effective

09/2014

4-8.2 OPERATION CHECK PERFORMANCE

Move the VCP-W circuit breaker to the TEST position
and engage the secondary contacts following the
procedure described in Paragraph 4-8.1. As soon as
control power becomes available, the motor will charge
the closing springs with this condition indicated by a
Spring Charged/Discharged Indicator on the front of the
circuit breaker (Figure

3-8).

In addition, the status of the

main contacts, open or closed, is indicated on the front of
the circuit breaker.

Using the close and trip buttons on the front of the
circuit breaker, close and trip the circuit breaker several
times to verify the closing and tripping operations.
Conclude the check by closing the circuit breaker.

The VCP-WR fixed circuit breaker can be checked in a
similar fashion as long as the circuit breaker is isolated
with no primary power present. The operation
performance can be conducted as long as secondary
control power is present.

4-9 BREAKER/STRUCTURE INTERFACING

Type VCP-W Vacuum Circuit Breakers are supplied with a
series of interlocks to insure safe and proper interfacing
between the circuit breaker and a compatible structure
compartment. The specific interlocks are described in the
next paragraph to provide the proper familiarization.
Once the interlocks are reviewed, an interfacing check
can be performed as described in Paragraph 4-9.2.

4-9.1 INTERFACE INTERLOCKS

Each circuit breaker is supplied with the following inter-
locks to insure safe and proper operation (Figure

4-2):

Code Plates (VCP-W Only)

Code plates are mounted at the bottom of the circuit
breaker to prevent the insertion of a circuit breaker into a
structure of higher power rating. A set of two code plates
on the circuit breaker and two in the compartment form
this interlock.

NOTICE

Code plates do not block out control voltage or
scheme incompatibility.

Close and Trip Floor Trippers

Mounted on the bottom of the circuit breaker, these
interlocks interface with compatible structure
interlocks to render the circuit breaker mechanism
mechanically and electrically trip free during the
levering process.

Anti-Close Interlock

This interlock prevents releasing the closing springs
electrically or manually if the circuit breaker is already
closed (Figure

5-5).

On a closed circuit breaker, the

interlock lever moves toward the rear. In this position,
the movement of the spring release clapper does not
lift the lever and thus the spring release latch cannot
be moved.

4-9.2 DRAWOUT BREAKER INTERFACING
CHECK (VCP-W)

Keep in mind that an interfacing check will be made
with a compatible structure. As such, the instructions
provided with the assembly will suggest other
interfacing conditions that should be observed and/or
checked, such as primary shutter operation,
MOC/TOC operation and levering handle insertion. A
complete, coordinated inter-face check, therefore, will
be a blend of the circuit breaker instructions and
those provided with the structural assembly. Together
all required standards are met and the ultimate in
safety is achieved.

Insert the circuit breaker into the structure and lever
it into and out of each different position by following
the procedures described in Paragraph 4-8.1.

When the secondary contacts are manually engaged
in the TEST position, the motor will charge the closing
springs. Close the circuit breaker. Attempt to engage
the levering crank to begin moving the circuit breaker
to the CONNECTED position. It will first be noticed
that the levering crank cannot be engaged with the
breaker closed. In addition, charged springs will be
discharged as the circuit breaker starts to move.

Once in the CONNECTED position, remove the
levering handle, close the circuit breaker and the motor
will begin charging the closing springs if control power
is available. Once again engage the levering handle
which can only be accomplished with the circuit
breaker open.

Lever the circuit breaker toward the TEST position.
The circuit breaker will be in a trip-free condition.
Continue to lever the circuit breaker all the way to the
TEST position and the secondary contacts will be
disengaged, now making it the DISCONNECT
position.