Problem
The valve of a mixer tap shall be controlled according to a desired given temperature.
A three-way mixing valve with valve actuator is used. The valve is
digital controlled in both directions. This is referred to as a 3-point
stepper control.
Varying the valve position can yield any mixing ratio of hot and cold entering water and so the water outlet temperature.
Solution
For SIMATIC S7-1200 as of firmware V2.0, the development environment
STEP 7 V11 provides the "PID_3Step" 3-point stepper control block.
The application on hand provides quick configuration and commissioning of your mixer tap.
The application also contains a simulation of the controlled system,
which enables familiarizing yourself with all functions of "PID_3Step".
The following features can be conveniently operated via KTP1000 Basic PN:
- Switching between automatic and manual mode
- Transition time measurement of the valve
- Visualization of the valve position
- Trend curves of setpoint, process value and output value
- Switching between the real controlled system and the simulation
- Disturbance value control in simulation mode
- Specifying the behavior in the case of errors and their simulation
- Specifying the deadband width for energy saving operation
- Manually specified control parameter and automatic tuning
- Online monitoring of the "PID_3Step" controller block
- Modifying the configuration during runtime
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