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Bettis Canada Ltd.
4112 91A Street
Edmonton, Alberta, Canada T6E 5V2
Tel: (403) 450-3600
Fax: (403) 450-1400
Edmonton
SERVICE MANUAL No. I-0168
MULTIPORT ELECTRONIC CONTROLLER
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DESCRIPTION DWG.NO. PAGE
I INTRODUCTION ......................................................... 2
II ACTUATOR ASSEMBLY ................................................... 2
TYPICAL ELECTRICAL ASSEMBLY DRAWING .................. IB0165 ........ 4
III MULT
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I INTRODUCTION The Multiport Electronic Controller (MEC) replaces the SW28 Switchpak, for the Multiport Selector Valve. This service manual is intended to supersede the SW28 Switchpak information in Multiport Selector Valve service manuals. II ACTUATOR ASSEMBLY A. MULTIPORT ELECTRONIC CONTROLLER (MEC): SWITCHPAK PEDESTAL, CONNECTOR, SWITCHPAK MODEL SW20N-AM AND ELECTRICAL CONDUIT (OPTIONAL LOCAL CONTROL STATION AND DIGITAL DISPLAY) NOTE : For MEC, see the typical actuator assembly drawing on p
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ACTUATOR ASSEMBLY continued . . . 5. See the typical drawing for Switchpak SW20N assembly on page 15, and the typical wiring diagrams on page 16 for DC supply and page 17 for AC supply. Install all wiring according to the electrical diagram and local regulations. 6. Check shaft alignment of the electronic controller to speed reducer by rotating both shafts independently, without binding occurring in the connector. Adjust if necessary. 7. With the Switchpak, the optional local control station a
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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
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MULTIPORT ELECTRONIC CONTROLLER continued... D. COMMUNICATIONS 1. ASCII BASED PROTOCOL/RS-232 CONNECTION The standard communications protocol for the MEC uses a simple ASCII format which connects the host device (computer, RTU or PLC) through jumper selectable connection. Refer to board drawing on page 18 for the jumper location, jumper ‘A’ for RS-232. The external host device sends commands through a RS-232 cable to the electronic controller at 1200 baud with 8 bits, no parity and one stop bit
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MULTIPORT ELECTRONIC CONTROLLER continued... 2. MODBUS RTU PROTOCOL/RS-485 CONNECTION Modbus RTU mode communications Supports unit address 1 to 250 Two wire RS-485 or five wire RS-232 operation Allows 32 MECs network on a communication line 9600 baud, 8 data bits, 1 stop bit, no parity Uses 120 OHMS 24 AWG twisted pair shielded cable Cable example: Belden #9841 Multidrop configuration 4000 feet maximum cable length 120 OHMS termination resistor required at the furthest point
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MULTIPORT ELECTRONIC CONTROLLER continued... Register Read disable positions. 40003 - Bits 1 to 8 indidacte which positions are disabled. Register Read current encoder position. 40004 - 0 to 1023 Register Write to set home position number. 40005 Read current home position number. - 1 to 8 RS-232 connections to MP-08 DA-09 connector: Pin #2 = RX-232 TX to host Pin #3 = RS-232 RX from host Pin #5 = Signal ground Pin #7 = RTS to host Pin #8 = CTS from host RS-485 connections to MP-08
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MULTIPORT ELECTRONIC CONTROLLER continued... F. OPTIONS 1. The optional digital display will indicate the valve position by port numbers 1 to 8. The corresponding port number will flash on the display when the valve plug is moving near or passing by a port, whether by using local controls or remote commands. Once the movement has stopped, the display will flash the port number that the valve is nearest, or a solid port number if the valve is exactly on position. The decimal point on the LED d
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MULTIPORT ELECTRONIC CONTROLLER continued... Any time during the movement of the valve, whether by remote commands in REMOTE mode, or by the STEP/JOG pushbutton in STEP mode, or by the HOME button on the circuit board, the valve can be stopped by switching the selector switch to JOG mode on the control station. In normal operation, the circuit board (MP-08) will be displaying a flashing RUN LED to indicate the microcontroller is running normally, similar to the flashing decimal point on the opt
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MULTIPORT ELECTRONIC CONTROLLER continued... I. DISABLING PORT POSITIONS CAUTION: Always ground yourself before and while touching the jumpers to prevent static discharge. A set of 8 jumper pins near the top right of the circuit board marked "DISABLE PORT" are to allow the installer to disable certain positions of the valve. Installing a shorting plug between the two pins will disable the specified position. Refer to board drawing on page 18 for jumper location. The positions are marked '1' t
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MULTIPORT ELECTRONIC CONTROLLER continued... 5. Mount encoder torque plate (21) to optical encoder (20) using screws (22) with the open slot opposite to the encoder ribbon cable. 6. Insert the shaft of optical encoder (20) into the top end of shaft (6). Align and engage the guide pin (16) into the slot of the encoder torque plate (21). Tighten setscrew (8) and capscrews (13) to secure the optical encoder (20) and the lower bracket (12) in position. NOTE: The optical encoder (20) is adjusted an
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IV TROUBLESHOOTING A. Actuator does not align plug to port. 1. If alignment is off only at one or two ports but the rest are aligned, then refer to assembly and adjustment procedures (refer to pages 2 to 4). 2. If alignment is off in the same direction for all ports then: a) Check the valve/actuator connector for looseness. b) Check the Switchpak/actuator connector for looseness. c) Check the motor for stalling or overload. d) Check the speed reducer for visual leakage or noisy gear. e) Check th
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V MULTIPORT ELECTRONIC CONTROLLER NOTES (I-0168--.wpd/20 orig:ap/ps-1996-08-13 rev2:dy/ar-1997-12-03 app dist:(EF)O);(SM)P)
