MC³ 90.10.EX O&M Manual
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The BPAC card has four AC inputs and 8 Relay outputs. The relays 1-7 are N/O types with relay
8 having the capability of being selected to N/O or N/C.
Up to four Back plane boards may be connected to the MC³ Controller when two (2) PCIO boards
are in the card stack assembly.
Card Stack Assembly
The Card Stack assembly consists of one (1) CPU Board, one (1) FastComm 422/4-104
Communication Board, one (1) or two (2) PCIO boards and one (1) LTI board. The Card Stack
Assembly in the panel mount enclosure is mounted to the slide tray. The slide tray is kept in place
by a pair of guides that are mounted on the enclosure and with catch screws on the back of the
enclosure. In the wall mount enclosure, the Card Stack Assembly is securely attached to the
mounting plate. All boards are connected electronically by way of an industry standard PC-104
interface bus.
Fastcom 422/4-104
The Fastcom 422/4-104 is a 4-port RS-422 serial communication board. All feeders to be
controlled by the 90.10.EX software must be attached to one of ports on this board.
CPU Board
The CPU Board contains the Intel 386EX Microprocessor and associated support circuitry for a
bus interface, serial interface and memory support. The newest CPU module includes both
available communication ports providing RS-232 and RS422/485 from both ports. The CPU
board is the bottom board of the card stack.
The RS-485 Serial Communications port is a feature that provides the circuitry necessary for the
MC³ Controller to communicate with other serial devices such as a SuperBridge or Personal
Computer. For more information regarding MC³, Serial Communications see the Merrick
Communications Specification Manual. This specification lists some hardware options and
interconnection examples and describes the Merrick Communications Protocol in detail.
PCIO Board
The PCIO Board provides the circuitry for two (2) isolated analog outputs; one (1) isolated analog
input, sixteen (16) digital outputs and eight (8) digital inputs. An additional PCIO Board is
available as an option giving the controller a capability of having four (4) isolated Analog Outputs,
two (2) isolated Analog Inputs, thirty-two (32) Digital outputs and sixteen (16) Digital inputs. Two
(2) racks of digital inputs and outputs can be connected to the PCIO board.
LTI Board
The LTI Board contains the circuitry required to process incoming synchronization pulses, outputs
for an AC and DC Electromechanical Totalizer (EMT) and an interface to the Display assembly.
Power Supply Assembly
The power supply is mounted on the front of the slide tray on the panel mount enclosure. On the
wall mount enclosure, the power supply is mounted under a protective metal panel. The power
supply for the door mount is normally attached to the cabinet away from the controller.
Display Assembly
The Display Assembly consists of a Touch Keypad, LCD Board and LCD Display.
LCD Board
This board is used to interface the LCD Display and the Touch Keypad to the LTI Board and
provides the proper voltage for the backlight of the LCD Display. There is a potentiometer for
adjusting the contrast of the LCD Display. In addition, on specific LCD Boards containing an
LS220 type inverter there is a Brightness Adjust potentiometer.
LCD Display
The LCD Display is a 240 horizontal by 128 vertical pixel resolution monochrome graphical
display. The display works in conjunction with the Touch Screen to provide a Graphical User
Interface (GUI).
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