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For a more general guide to Process Controller (with tutorials), see the Process Controller ProCoDA Software page.
Basics
- States: States represent different control configurations. Each has different control settings and each have different rules that determine when the state ends and what state comes next. Each state has independent control settings which means that each is defined uniquely by which pumps are on or off and which valves are opened or closed. It is these states that tell Process Control what to make the system do. Not all are necessarily used in a process; states can be designed for testing pumps, to clean the system and so on. States are listed in a drop-down list and can be added or removed BUT they are place sensitive meaning each is assigned an identification number in the list of states so deleting a state will alter the number ID of the states proceeding it. When using a state you must pull it using this number. Also important to remember is that the first position is "0", not "1".
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To toggle between states, click on the Plant Operation tab after opening process controller. On the upper left corner, the states can be changed by clicking the up or the down arrow.
- OFF
Every pump is turned off. Nothing is running during this state.
- Turn Pump On
This state turns only the water pump on. Process controller stays in this state unless changed by an operator.
- Both Alum and Pump On
This state turns on both the alum pump and the water pump. For the alum dosing, the A + Blog(NTU) formula for dosage is used. Process controller stays in this state unless changed by an operator.
- Change Location Stay
Both pumps are on in this state. After the residence time of the tank has passed by, Process Controller switches to the Hold state. For the alum dosing, the A + Blog(NTU) formula for dosage is used.
- Residence Time of Tank
Process Controller runs both pumps for the residence time of the tank then shuts the tank OFF. The A + Blog(NTU) formula for dosage is used for the alum dosing.
- Hold
This state is the idle state. Leave Process Controller in this state when modifications are being made to the tank. It functions the same way as Both Alum and Pump On except data recorded while in this state are ignored.
- Change Location (Leave)
Both pumps are on in this state. After the residence time of the tank has passed by, Process Controller switches to the Both Alum and Pump On state. The A + Blog(NTU) formula for dosage is used for the alum dosing.
- Increment Alum
Both the alum and water pump are on in this state but a different dosing of alum is used that starts the alum dosage at a set level and increases it by a preset amount. Process controller runs on this state until the residence time of the tank has elapsed, then Process Controller switches to the Run Increment Alum state.
- Run Increment Alum
This state is the same as Increment Alum except Process Controller switches to the Increment Alum state after the residence time of the tank has elapsed.
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