6-4.2 Electrical Interfaces; 6-4.3 Mechanical Interfaces; Series 20 Primary Connection - Eaton Cutler-Hammer VCP-WR 18 Series Instructions For The Use, Operation And Maintenance

Page 32
• 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 sec-
ondary control terminal blocks located behind the break-
er 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 ele-
ment is properly installed and applied in a fixed or dra-
wout configuration. Depending upon the final applied
configuration, the customer is responsible for but not lim-
ited to the following:
• An appropriate truck and levering mechanism for dra-
wout breaker designs.
Figure 6-5 Series 20 Primary Connection
• The appropriately sized and secured primary connec-
tions for fixed or drawout designs. Refer to the follow-
ing specific details entitled "Primary Connections."
• The entire cell structure for drawout configurations
with appropriate interlocks, levering mechanisms, bar-
riers and circuit breaker interfaces to insure compli-
ance with applicable ANSI Standards.
• Properly designed and proven by test interfaces nec-
essary 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 ele-
ment, 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 connec-
tion details, such as primary spacings and hole patterns.
Kits which include primary finger clusters applicable to
drawout breaker designs are available from Cutler-ham-
mer 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 rack-
ing. 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 bring-
ing 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 opera-
tor is coupled to the pole shaft. As a breaker closes, the
operator moves to change the MOC switch contact posi-
tion. MOC switch contacts operate in the same manner
I.B. 8295A61H03
Effective 7/97