Specifications

Multiplex Company, Inc.
Complete System Overview
00218011 Revision B (KAK) 31 July, 2000
48
New Model MPC84A Portion Control Board
A new portion control board, the Model MPC84A, has been developed to improve the
performance and maintain the functions and feature of the previous Model MPC64A. In addition, this
Porction Control board has passed the very demanding EMC (radio frequency emissions and
interference) testing for European CE approval, at the UL labs. The Model MPC64A has been phased
out as of June 1996. Only the Model MPC84A will be used on new production and for service.
The new bard is the same size, has the same mounting locations, and uses the same connectors
as the previous board. This article is to explain the features (which can be used to your advantage)
and minor differences.
The major difference is the same size board. The Model MPC84A can control up to eight stations
(dispensing valves) with up to four sizes per station. The Model MPC64A could control up to six
stations.
The illustration in Figure 1 depicts the connectors on the Model MPC64A. The illustration in
Figure 2 depicts the connectors on the Model MPC84A.
The power connectors J15 and J20 (24 VAC) are the same. The keyboard connectors, J16 for
touchpad and J17 for calibration touchpad, are the same.
The Model MPC84A adds one more two pin keyboard connector, the J1. For an eight station tower,
this connector, along with a separate two wire cable to the proper keyboard, provides the two extra
stations.
The five pin valve connectors, the J7 to J12 on the Model MPC64A, are changed to a two pin
connectors, the J7 to the J14 on the MPC84A. These valve connectors are not polarized (does not
matter how you connect the two pins) except when the valve has a water or a soda harness.
The calibrating functions of the new portion control board are the same as the old board.
Figure 1
Figure 2