Instruction Book
Page 24
Effective: May 2016
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IB131017EN
Figure 4-3 Cassette Rejection Interlock Pin Positioning
WARNING
NEVER DISABLE OR DEFEAT ANY INTERLOCKS.
HAZARDOUS VOLTAGES WILL CAUSE DEATH,
SEVERE PERSONAL INJURY OR PROPERTY DAM-
AGE.
Secondary Control Interlock
This interlock insures that the breaker cannot be levered
into the CONNECTED position if the cassette end connector
of the secondary umbilical cord is not properly engaged with
its cassette mounted connector. This interlock inter-faces
with the cradle mounted shoot bolt interlock which will
prevent secondary disconnection with the breaker
connected.
Levering Interlock
The levering crank can only be engaged when the breaker is
open and the horizontal shoot bolts located in the breaker
cradle are properly engaged (fully extended). The breaker
contacts will not close manually or electrically while the
levering crank is engaged. Shoot bolt details are provided
later.
Anti-Close Interlock
This interlock prevents closing electrically or manually if the
breaker is already closed.
Anti-Latch Interlock
This interlock prevents the breaker contacts from being
closed between the CONNECTED and TEST positions.
Shutter Drive Interlock
The metallic primary safety shutters are independently
operated permitting them to be locked in the closed
position for safety when the breaker is disconnected or
removed or the open position for servicing the fixed primary
disconnects. The locking system is not automatically
disabled when the breaker is being connected.
Consequently, the lock
must be removed
prior to racking
or damage to the shutter drive will result.
Handle Interlock
Prevents racking in or removing a circuit breaker which is
closed.
Hook Interlock
Prevents a circuit breaker which is "racked in" from being
inserted into a cassette. Refer to the CAUTION below.
4-6.2 CIRCUIT BREAKER POSITIONING
The VCP-TL drawout circuit breaker has three normal
positions within the cassette:
DISCONNECT
TEST
CONNECT
In the DISCONNECT position, the circuit breaker is
completely inside the cassette in the forward
most position. The breaker end of the connector of the
secondary umbilical cord is made but the cassette end of
the connector of the umbilical cord is not made. The shoot
bolts cannot be fully engaged. Primary connect-ions are
not made.
In the TEST position, the circuit breaker is also completely
inside the cassette in the forward most position. In this
position, however, the secondary connections are made on
both the breaker end and the cassette end. The shoot bolts
are fully engaged and the interlock lever must be locked.
The Primary connections are not made.
In the CONNECT position, the circuit breaker is in the
cassette as far as possible. The primary connections are
fully made and secondary connections remain made and
locked in position.
CAUTION
MAKE SURE THE CIRCUIT BREAKER ELEMENT IS IN
THE FULLY RACKED OUT POSITION IN THE CRADLE
BEFORE ANY ATTEMPT IS MADE TO PUT THE
CIRCUIT BREAKER INTO THE CASSETTE. FAILURE
TO DO SO COULD RESULT IN EQUIPMENT DAMAGE
OR BODILY INJURY DURING LIFTING AND
HANDLING. REFER TO PARAGRAPH 4-6.4 FOR
CIRCUIT BREAK-ER LEVERING DETAILS (FIGURES 4-
14 AND 4-15).
