11Publication 2100-IN012C-EN-P - April 2009 11
Chapter
1
General Information
General Description
Allen-Bradley CENTERLINE Motor Control Centers (MCCs) consist of
one or more vertical sections containing electromagnetic and/or solid
state control devices that are prewired and tested within modular
(plug-in) or frame mounted (hard-wired) units.
CENTERLINE MCCs are designed in standard widths of 20 in.
(508 mm), 25 in. (635 mm), 30 in. (762 mm), 35 in. (789 mm), and
40 in. (1016 mm). The standard front-mounted depths of an MCC are
15 in. (381 mm) and 20 in. (508 mm), in addition back-to-back
mounted depths of 30 in. (762 mm) and 40 in. (1016 mm) are also
offered. The standard height of an MCC is 90 in. (2286 mm). A 70.5 in.
(1791 mm) high section is also available. All MCC sections are
supplied with top and bottom horizontal wireways. Sections which
are designed to accommodate plug-in units include a vertical
wireway. Each 90 in. (2286 mm) vertical section can accommodate up
to 6.0 space factors or 78 in. (1981 mm) for units.
Units (buckets) are designed in increments of 0.5 space factors. Each
0.5 space factor is approximately 6.5 in. (165.1 mm) high. Units are
designed as either removable (plug-in) or frame-mounted
(non-plug-in).
Individual units house a wide variety of power and logic devices.
Plug-in units are mounted on unit support pans within the section.
Stab assemblies located on the back of the unit plug onto the vertical
bus. A mechanical interlock prevents the unit door from being opened
when the disconnect is not in the OFF position. An additional
mechanical interlock prevents the unit from being plugged-in or
unplugged when the disconnect is not in the OFF position.
Line power is distributed throughout the MCC via an isolated bus
work structure. The main horizontal bus is located in the center of
each section. Standard, center-fed, 300 A rated vertical bus supplies
power to the individual units above and below the horizontal bus for
an effective 600 A capacity, allowing virtually unrestricted unit
arrangement. An optional 600 A vertical bus provides 1200 A effective
rating.
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