How is PID programmed on the ATV320 drives?

Using the dial on the display, Push Enter and turn to CONF > FULL > FUN > PID.

Under the PID Regulator menu set:
PIF - PID feedback assignment

PIF1 - Min PID feedback
PIF2 - Max PID feedback
PIP1 - Min PID reference
PIP2 - Max PID reference
PII - Act. Internal PID ref
RPI - Internal PID ref


Min/Max PID Reference and Feedback are typically set to the range of the transducer.  Act. Internal PID turns on the internal set point.  Internal PID ref is the set point you want to maintain.

Example:
You have a transducer, 4-20 mA output with a 0-100PSI range wired to AI3 and COM.  You want to maintain 40PSI pressure.  The recommended settings would be:
PIF - AI3
PIF1 - 0
PIF2 - 100
PIP1 - 0
PIP2 - 100
PII - yes
RPI - 40

This would maintain 40PSI (10.4 mA feedback) in the system based on 4-20 mA signal coming into AI3.
As the feedback from the transducer falls below the set point, the motor speed will be increased to bring the pressure up.   If the pressure increased above the setpoint, the motor will be slowed to allow the pressure to drop back to the set point.

Note that most transducers output 4ma at minimum pressure and 20ma at maximum pressure.  Some transducers operate the reverse of this with 20ma at low pressure and 4.0ma at high pressure.   If this is the case, when you start your drive the motor will either go to minimum speed and not increase, or maximum speed and not decrease.   In this situation, parameter PIC should be changed from No to Yes.  This will reverse the reaction of the drive to a change in pressure.

RPG: PID Proportional gain and RIG: PID controller integral gain may occasionally need adjustment to limit overshoot and to stabilize the response to system changes.  For most pump and fan applications, settings less than 1 provide acceptable response and the RDG: PID derivative gain can be left at 0.
If RPG is too high the system will overshoot the setpoint and can have significant instability before approaching the setpoint.
If RPG is too low the system may never reach it's setpoint.
If RIG is too high the system will search or hunt around the setpoint, taking a long time to stabilize.
If RIG is too low the system will take a long time to reach setpoint.


This is where you'll find the settings in SoMove:



The full ATV320 Programming Manual can found here: https://www.schneider-electric.us/en/download/document/NVE41295/

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