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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
display will flash to indicate that all functions of the MEC are operating normally.
2. The optional local control station contains a 3-position selector switch and a STEP/JOG
pushbutton. The three selector modes are REMOTE (this enables communication with
the host device and disables the pushbutton), JOG (this runs the motor and moves the
valve while the pushbutton is pressed) and STEP (this advances the valve plug to the
next port after the pushbutton is momentarily pressed).
3. Software for personal computers in DOS, Windows 3.11, Windows 95 versions provide a
graphical representation of MEC operation.
G. OPERATION
For MEC without the local control station, the Multiport Selector Valve can be controlled by
the small buttons on the circuit board, or by remote commands received through the
communication port. The control buttons marked on the circuit board are the "SET ZERO"
button for calibrating home port position, the "HOME" button for returning the valve to home
port position automatically (after momentary contact, the MEC takes over), and the "JOG"
button for moving the valve to any desired port position manually (motor runs while button is
pressed). These buttons are always active, and normally used only for calibration and
maintenance purposes. (See item H).
When the MEC includes the optional local control station, the selector switch must be set in
REMOTE mode for remote commands to control the Multiport Valve. If a command is
received through the communication port, the controller will move the valve to the position
specified. The STEP/JOG pushbutton on the control station will be disabled in REMOTE
mode. Setting the selector switch to STEP or JOG allows local control, even if there is no
external host device connected.
When the selector switch is set to JOG mode, the Multiport Valve is controlled manually by
the STEP/JOG pushbutton on the control station. Press and hold the button until the
indicator is aligned over the desired port and then release it.
CAUTION: The valve plug will be moving as long as the control button is depressed, and
will stop at any position when the button is released, whether or not the valve
is exactly on a port position.
NOTE: In the event of communication failure with the host device, or failure of the MEC
electronics, the Multiport Selector Valve can still be locally controlled by selecting
JOG mode and pressing the STEP/JOG button.
When the selector switch is set to STEP mode, the valve plug can be automatically
advanced to the next port by pressing the button momentarily. The MEC will take over to
move the valve plug exactly to the next enabled port position. The control buttons on the
circuit board will still function.