PID Feedback Loss

What does FbL mean?

The drive has detected a loss or significant deviation in the feedback signal for its PID control loop. This prevents proper process control, as the drive cannot accurately assess the controlled variable.

Click steps to track your progress.

1. 1

   Inspect all feedback sensor wiring for loose connections, damage, or improper shielding between the sensor and the drive's input terminals.

2. 2

   Verify the feedback sensor's power supply voltage and measure its output signal (e.g., V, mA, Hz) directly at the sensor terminals to confirm proper operation.

3. 3

   Measure the feedback signal (e.g., voltage, current, frequency) at the corresponding analog or digital input terminals of the Yaskawa P1000 drive to confirm signal presence and integrity.

4. 4

   Check the Yaskawa P1000 drive's PID feedback parameters (e.g., input source selection, scaling, filtering) to ensure they are correctly configured for the installed sensor type and process requirements.