Armfield Instruction Manual
38
Operating the On/Off Solenoid Valves
There are three On/Off Solenoid Valves on the base unit. SOL1 is located near the
mains water inlet. SOL2 and SOL3 are located near the base of the large process
vessel. When required for a teaching exercise, the valves are operated from the
mimic diagram screen in the PCT40 software. The switches are represented as
buttons on the screen, and are operated by clicking on them with the cursor. The
switches will display a ‘0’ when the valves are off (closed) and a ‘1’ when the valves
are on (open).
Some exercises include PID control of one solenoid valve. In these exercises the
valve is controlled via the PID control window, and the switch is displayed onscreen
only to give an indication of whether the switch is in the on or off position.
Operating the Proportioning Solenoid Valve
The Proportioning Solenoid Valve, PSV, is located near the mains water inlet. When
required for the teaching exercise being undertaken, this valve is operated from the
mimic diagram screen in the PCT40 software. The controls for the valve are
represented by a text display box showing the current setting of the valve as a
percentage value. For exercises requiring manual control of the PSV valve a second
display box will include arrow buttons to increase (up arrow) the value or to decrease
(down arrow) the value. New values may also be typed into this second box.
Some exercises include PID control of the proportioning solenoid valve. In these
exercises the valve is controlled via the PID control window, and the control boxes
are displayed onscreen only to give an indication of the valve position and (where
applicable) the current manual setting.
Filling the Process Vessels
The process vessels may if required be filled manually by removing the lid and
pouring water in from the top. The large process vessel may also be filled via the
tappings in the base from the mains inlet pipe. The small process vessel may be
filled from the mains inlet pipe via one of the quick release fittings in the side wall.
These may be connected to solenoid valve 1 (SOL1) or the Proportioning Solenoid
Valve (PSV), and the valve may then be used to regulate flow from the mains inlet
into the process vessel.
The teaching exercises provided in this manual include instructions for filling the
vessel(s) as required.
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