MC³ 90.10.EX O&M Manual
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recommends that the controller should be located out of direct sunlight and away from dripping
water and must be protected from heavy rain.
The wall mount enclosure is available in NEMA-4 or NEMA-12 boxes. NEMA-4 box includes
gaskets and a window kit over the touch screen to provide extra protection.
Installation
Mount the controller on a vertical surface, Use dimensions provided in Wall Mount – Mounting
Dimensions on page 50 for placement of hardware used to secure enclosure to surface. Make
sure there is adequate clearance around the unit for swinging open the door and for
maintenance.
Door Mount
A door mount enclosure is available that separates the power-supply and Backplane boards from
the controller. This style includes a window for protection from the elements. It also adds two
fans to the cover of the enclosure to improve air circulation for better cooling.
The Merrick MC³ Door Mount Controller is designed for mounting in a control panel. It is suitable
for use in environments that are generally clean, and within the temperature range of 32º to 122º
F (0º to 50º C). It must be protected from all but incidental water or significant dirt or dust.
Installation
Mount the controller in the panel. Cut panel to dimensions provided in Door Mount - Dimensions
on page 51. Insure there is adequate clearance around the controller for maintenance and
ventilation. Install the controller into panel using the mounting brackets provided.
Electronic Cards
Backplane Board
Most of the Digital I/O connections to the MC³ will be made through the Back plane Board. The
Back plane mounts vertically in the rear access cover on the Panel mount type enclosure. On the
Wall mount enclosure, the boards are mounted directly below the Card stack assembly. When
the Door Mount controller is used, the boards are normally placed on a panel inside the cabinet.
There are two types of Back plane cards available, a dry contact enclosure input card (BPLN) and
an AC input card (BPAC). The BPLN card has four dry contact inputs and 7 relay (N/O) outputs.
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