Cause: PID feedback regulation warning comes when incorrectly tuned PID parameters (P, I, D) can lead to poor regulation and instability or faulty or improperly calibrated sensors can provide inaccurate feedback to the controller.

"PISH" "PID Feedback Regulation" warning in a Schneider ATV950 drive indicates that the PID control loop is having difficulty maintaining the setpoint due to issues with the feedback regulation. This warning can be triggered by various factors such as incorrect PID tuning, sensor malfunctions, or changes in the process conditions.

Here are the steps to address the PISH warning:

1. Check Feedback Sensor:

   • Verify the feedback sensor to ensure it is functioning correctly and providing accurate readings. Look for any signs of damage, malfunction, or incorrect installation.

2. Inspect Sensor Wiring and Connections:

   • Ensure all wiring and connections between the sensor and the drive are secure and undamaged. Loose or corroded connections can lead to incorrect feedback readings.

3. Review PID Tuning Parameters:

   • Check the PID control parameters (Proportional, Integral, and Derivative gains). Incorrect tuning can cause instability or sluggish response in the control loop.
   • If necessary, retune the PID parameters to improve the regulation of the feedback signal.

4. Analyze Process Conditions:

   • Examine the current process conditions to determine if there have been any changes that could affect the feedback regulation. This could include changes in load, process demands, or environmental conditions.

5. Monitor Feedback Signal:

   • Use the drive’s monitoring features to track the feedback signal in real-time. Look for patterns or anomalies that could indicate why the feedback regulation is failing.

6. Calibrate Sensors:

   • If possible, calibrate the feedback sensor to ensure it is providing accurate measurements. Calibration may correct any drift or inaccuracy in the sensor readings.