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5
III MULTIPORT ELECTRONIC CONTROLLER
A. INTRODUCTION
The Bettis Multiport Electronic Controller (MEC) consists of a motor, Switchpak model
SW20N, optional local control station and position display. It is a microcontroller based
system developed to control and monitor status of the Multiport Selector Valve. It provides
improved accuracy, eliminates mechanical adjustment of cams, and allows digital
communication with one or more Multiport Valves over a single cable.
B. TECHNICAL DESCRIPTION
The MEC uses an optical absolute encoder to read the position of the valve into a 8 bit
microcontroller. The encoder resolution is 1024 readable positions within the 360b rotation
of the valve which results in the plug position being monitored to 0.35b accuracy. The
microcontroller controls the motor on/off relay, and the optional digital display, with input
from an external host device (computer, RTU or PLC) via a digital communication
connection. The inputs from the optional local control station (switch position and
pushbutton sense) are also connected to the microcontroller. The microcontroller utilizes a
memory chip (EEPROM) which retains the home port setting, and ASCII text message for
the valve, even during power failure.
C. ELECTRONIC CONTROLLER SPECIFICATIONS
INPUT VOLTAGE OPTIONS: 1. 120 VAC (50 - 60 Hz)
2. 24 VDC
USES SOLID STATE AC RELAY AND
TRANSFORMER
USES SOLID STATE DC RELAY AND
TRANSFORMER IF REQUIRED
BOARD INPUT VOLTAGE: 8 - 30 VDC OR 9 - 20 VAC
BOARD INPUT CURRENT: 0.5 AMP MAXIMUM
BOARD (MP-08): CONFORMAL COATED
LIGHTING PROTECTED
FUSE: 1 AMP TIME DELAY
TEMPERATURE RATING: -40bC TO +70bC
-40bC TO +85bC OPTIONALLY
SHOCK AND VIBRATION: 10 G's
HUMIDITY: 98% WITHOUT CONDENSATION
PROTOCOLS: 1. ASCII BASED
2. MODBUS RTU
CPU CHIP LABELLED "STD"
CPU CHIP LABELLED "MODBUS"