Instruction Book
Effective: February 2007
Page 33
I.B. 8295A61H07
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Note the position switch (PS1) contact in the spring
release circuit in the scheme. This contact remains
made while the breaker is being levered between the
TEST and CONNECTED positions for appropriately
retrofitted breakers. Consequently, it prevents the
breaker from closing automatically, even though the
control close contact may have been made while the
breaker is levered to the CONNECTED position.
When the CS/C contact is made, the SR closes the
breaker. If the CS/C contact is maintained after the
breaker closes, the Y relay is picked up. The Y/a contact
seals in Y until CS/C is opened. The Y/b contact opens
the SR circuit, so that even though the breaker would
subsequently open, it could not be reclosed before
CS/C was released and remade. This is the anti-pump
function.
5-4.1 TIMING
The opening and closing times for the circuit breakers
vary depending upon the control voltage and the power
rating. Typical values for VCP-WR breakers are shown
in Table
5.1.
5-4.2 TERMINAL BLOCKS
All VCP-WR breaker elements are supplied with 2 12-
point secondary control terminal blocks for simple
secondary control access. A number of points are
used for breaker operation with a number of spare
contacts for customer use. Refer to the control
schemes of Figure
6-2
for exact contact useage and
availability.
Table 5.1 Breaker Timing
Event
Milliseconds (maximum)
Closing Time
(From Initiation of Close
Signal to Contact Make)
75
Opening Time
(Initiation of Trip Signal
to Contact Break)
45
Reclosing Time
(Initiation of Trip Signal
to Contact Make)
190
The terminal blocks are in different locations for each
series of VCP-WR breakers. Series 18 terminal blocks
are located at the top of the breaker element (Figure
3-1
).
Series 20 terminal blocks are located behind the breaker
faceplate in the front, lower left portion of the breaker with
control wire access from the bottom. Series 29 terminal
blocks are located at the bottom of the breaker element
(Figure
3-5
).
5-5 OPERATIONS COUNTER
All breakers are equipped with a mechanical operations
counter. As the breaker opens, the linkage connected to
the pole shaft lever advances the counter reading by one
(Figure
3-7
).
Summary of Contents for Cutler-Hammer VCP-WR Series
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