Exercise C
65
Observe in the software that the valve is OFF and therefore CLOSED, with no water
flowing.
OPEN the valve SOL1 as follows: Check that the ‘Controller’ radio button is selected
in the On/Off – Solenoid 1 box on the left of the screen. Select ‘Control’ below the
Tank Level sensor display, to open the PID controller window. Choose ‘Manual’
Mode of Operation then set ‘Manual Output’ to 100% and click on ‘Apply’. There
should be an audible click as the valve opens, and water should begin to flow into the
process vessel.
Observe that water flows into the large process vessel.
Allow the fluid level to rise until it reaches the desired level in the vessel. 200mm is
suggested.
Close the valve SOL1: In the PID control window set ‘Manual Output’ to 100%. There
should be an audible click as the valve closes, and water should stop flowing into the
process vessel.
Observe that the fluid level in the large process vessel falls as water continues to
drain.
Select the
icon to begin data logging.
By operating the valve SOL1 via the PID controller window using manual control,
maintain the fluid level in the process vessel. Note the action required to maintain this
level.
Select the
icon to finish data logging.
Create a new results sheet by selecting the
icon in the tool bar of the software.
Disturbances
Within the software it is possible to introduce disturbances in the outflow from the
vessel by opening the Normally Closed solenoid valves SOL 2 and SOL 3.
Select the
icon to begin data logging.
In the software, select the switch to open valve SOL 2.
Continue to control the height by manually operating SOL1, noting any change in the
control actions required.
Open valve SOL 3. Both SOL2 and SOL3 should now be open
Continue to control the fluid level in the process vessel. Note whether it is possible to
maintain the fluid level with both outlet valves open.
Close both valves SOL 2 and SOL 3 and return the fluid level to the set point.
Select the
icon to finish data logging.
Create a new results sheet by selecting the
icon in the tool bar of the software.
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