Inverter PID control; Inverter PID control is a closed loop control, and the controlled system and the inverter must form a closed loop. PID control circuit should be set inside the inverter.
PID control application: (1) Applied to process control. Such as constant pressure water supply control, constant pressure air supply, constant temperature control, etc. (2) Applied to steady speed control.
Frequency conversion constant pressure water supply system1. PID control configuration
1) Set the target value to the given terminal and target value.
2) Set the feedback quantity given terminal and feedback quantity.
3) Install the sensor
Suppose the equipment is a water pump, the required pressure is 0.6MPa, the sensor range is 0~1MPa, the output voltage is 0~10V, and the target signal is given as 6V. If the feedback voltage is less than the target voltage, the speed will be increased; if the feedback voltage is greater than the target voltage, the speed will be reduced; and the feedback voltage will be equal to the target voltage and run at a constant speed.
2. PID control characteristics
The main function of PID control is to eliminate shocks and improve the speed of recovery
P controller-amplifier, improve the rapid response of the system and reduce static error. I controller-integrator, eliminate system oscillation.
P and I parameters are debugged on site.
Application of PID in constant pressure water supply
1. Two control methods
Independent PID control
Indirect PID control, a water supply system composed of a PLC constant pressure water supply control system and a frequency converter
2. Application examples;
PID application case-Danfoss FC51 inverter PID application
Danfoss FC51 series inverters have very good closed-loop control characteristics. The amount of feedback signal is stable. The pressure taken from the water pump constitutes the constant pressure water supply, and the temperature taken from the temperature constitutes the constant temperature control.
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