What is Proportional Integral Derivative (PID) Controller?

PID is a control loop feedback mechanism used in manufacturing equipment and industrial control systems where the primary focus is calculating the values setpoint parameters of the temperature controller; offering a more precise way of maintaining temperature.

The three functions of PID are defined below:

  • P = Proportional
    • Proportional control stabilizes the work load temperature and upon startup reduces temperature overshoot.
  • I = Integral
    • Resets “pushes” the actual temperature toward the setpoint temperature, until they are equal; this eliminates droop.
    • There are two types of Integral; manual & automatic.
  • D = Derivative (a prediction of future errors; based on the current rate of change)
    • Also known as “Rate”, this function is to prevent or greatly reduce overshoot/undershoot a setpoint temperature.

What is Autotune PID?

When the Autotune function is initiated, it goes through two ON/OFF cycles then calculates the PID values and inserts them into memory for your thermal system. There is a 90+% accuracy with Autoune PID and in addition, the operator can also change the stored PID values to further improve temperature control.

EZ-ZONE® PM Primary Functions are available for the following options in it’s temperature controller.

  • C = PID controller with universal input
  • R = PID controller with universal input and profiling ramp/soak
  • *B = PID controller with universal input and profiling ramp/soak and battery back-up with real time clock
  • J = PID controller with thermistor input
  • N = PID controller with thermistor input and profiling ramp/soak
  • *E = PID controller with thermistor input and profiling ramp/soak and battery back-up with real time clock
  • S = Custom firmware

*Options B & E are not available with 1/32 DIN (PM3) or 1/16 DIN (PM6) models.