Armfield Instruction Manual
74
Controller-controlled time proportioning
In the PCT40 software, open the PID controller window.
Set the Set Point to 200mm.
Set P to 100%.
Leave I and D set to 0.
The Manual Control setting may be ignored.
Leave the Cycle Time at 10s.
Select the Automatic Control radio button and click on ‘Apply’. The valve should
begin to operate intermittently as the time proportional controller sends signals to
control it.
Select the
icon to begin data logging, and observe the fluid level in the process
vessel. Note the behaviour of SOL1 as the fluid level approaches the Set Point.
When the oscillations around the Set Point have settled, select the
icon to finish
data logging.
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.
Create a new results sheet by selecting the
icon in the tool bar of the software.
Select the
icon to begin data logging.
In the software, select the switch to open valve SOL 2.
In the Manual Control section of the PID control window, modify the percentage value
until the fluid level is maintained at a constant value
Open valve SOL 3. Both valves SOL2 and SOL3 should now be open. Modify the
percentage value to maintain the fluid level in the process vessel, and note any
problems with maintaining this level.
Close both valves SOL2 and SOL3 and set the percentage value back to the setting
it was at the start of this section of the exercise. Note whether this value still
maintains the fluid level as before.
Select the
icon to finish data logging.
Feed Rate
Create a new results sheet by selecting the icon in the tool bar of the software.
Select the
icon to begin data logging.
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