PID Feedback Supervision Fault (PID1)

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The feedback value for PID controller 1 is outside the configured supervision limits (P3.13.6.2 and P3.13.6.3) for a specified delay (P3.13.6.4). This indicates a deviation from the expected process variable feedback, suggesting an issue with the process or the sensor. It can lead to incorrect control actions and process instability.

• Malfunctioning process sensor providing feedback to PID controller 1 (e.g., pressure, flow, level sensor) causing an out-of-range signal.
• Feedback signal cable from the sensor to the drive's analog input (e.g., AI1) is damaged, disconnected, or experiencing high noise.
• PID supervision limits (P3.13.6.2 for low limit, P3.13.6.3 for high limit) are set too tightly for the process's normal operating range or expected transients.
• The process being controlled by PID1 is experiencing a severe disturbance (e.g., pump cavitation, valve blockage) leading to a significant feedback deviation.
• The delay time for supervision (P3.13.6.4) is set too short, causing the fault to trigger prematurely during acceptable process fluctuations.

Klikk på steg for å spore fremgangen.

1. 1

   1. Verify the physical process feedback signal at the assigned analog input terminal (e.g., AI1) using a multimeter, comparing it to the actual process variable reading.

2. 2

   2. Inspect the wiring from the process sensor to the drive's analog input for continuity, proper shielding, and secure connections.

3. 3

   3. Check the process sensor itself for proper operation, including its power supply, output range, and calibration.

4. 4

   4. Review and adjust the PID feedback supervision parameters: P3.13.6.2 (low limit), P3.13.6.3 (high limit), and P3.13.6.4 (delay time) to match the process's expected behavior.

5. 5

   5. Observe the controlled process for any abnormal conditions (e.g., blockages, mechanical failures) that could cause the feedback deviation.

6. 6

   6. Ensure the analog input scaling (e.g., P3.3.1.2 for min value, P3.3.1.3 for max value) for the feedback signal is correctly configured.