Instruction Book
Page 38
Effective: February 2007
For more information visit: www.EatonElectrical.com
I.B. 8295A61H07
•
Review the details presented in Table
1.1
and
Figures
1-2, 3-3, 3-4, 3-7
and
5-1.
•
Review the Series 20 specific control scheme
(Figure
6-2
)
and the outline drawing (Figure
1-2
)
presented earlier before proceeding.
6-4.2 ELECTRICAL INTERFACES
Secondary control access is provided by 2 12-point
secondary control terminal blocks located behind the
breaker faceplate in the front, lower left portion of the
breaker. The Series 20 control scheme indicates
which points are used for breaker operation and
which are available for customer use (Figure
6-2
).
6-4.3 MECHANICAL INTERFACES
The customer is responsible for providing all required
mechanical interfaces to insure that the Series 20
element is properly installed and applied in a fixed or
drawout configuration. Depending upon the final
applied configuration, the customer is responsible for
but not limited to the following:
•
An appropriate truck and levering mechanism for
drawout breaker designs.
Figure 6-5 Series 20 Primary Connection
•
The appropriately sized and secured primary
connections for fixed or drawout designs. Refer to the
following specific details entitled “Primary Connections.”
•
The entire cell structure for drawout configurations with
appropriate interlocks, levering mechanisms, barriers and
circuit breaker interfaces to insure compliance with
applicable ANSI Standards.
•
Properly designed and proven by test interfaces
necessary to operate Series 20 breaker element supplied
interlocks and auxiliary switch operators, if required.
Primary Connections
The customer is responsible for providing all properly
sized primary connections to the VCP-WR breaker
element, whether the connections take the form of cable or
bus bar (Figure
6-5
)
.
The Series 20 outline drawing
(Figure
1-2
)
provides breaker element primary connection
details, such as primary spacings and hole patterns.
Kits which include primary finger clusters applicable to
drawout breaker designs are available from Cutler-
hammer as an optional item.
Floor Tripper Interlocks (Drawout Designs)
Open and closing floor tripper interlocks are operated by
the interaction between the floor tripper rollers on the
bottom of the breaker element and the carriage or cradle
assembly provided by the customer (Figure
6-6
).
The
functions they are intended to perform are as follows:
1. The breaker is held mechanically trip free during
racking. The latch check switch is also held open, thus pre-
venting any electrical close signal from closing the
breaker.
2. The breaker is permitted to be withdrawn in the safe
mode (breaker open/springs discharged) when bringing
the breaker to the Withdrawn position or to the Connected
position.
The two outlined functions are accomplished by pushing up
the tripper rollers.
When required, the customer is responsible for providing
the proper interfaces with the Series 20 opening/closing
floor trippers. Refer to the Series 20 outline drawing
(Figure
1-2
)
for specific details as to exact locations and
the amount of travel associated with each tripper.
MOC Operator
The MOC (Mechanism Operated Control) switch operator
is coupled to the pole shaft. As a breaker closes, the
operator moves to change the MOC switch contact
position. MOC switch contacts operate in the same
manner
Summary of Contents for Cutler-Hammer VCP-WR Series
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