Excessive PID Feedback
Yaskawa · J1000 AC Drive
What does FbH mean?
The PID feedback input signal has continuously exceeded the threshold set in parameter b5-36 for a duration longer than specified in b5-37. This fault occurs when PID fault detection (parameter b5-12) is enabled (e.g., set to 1, 2, 4, or 5). Common causes include incorrect PID parameter tuning, faulty feedback wiring, or a malfunctioning feedback sensor, leading to unstable process control.
Complete Troubleshooting Guide
- 1
Review and adjust the PID feedback parameters b5-36 (feedback level threshold) and b5-37 (delay time) to accurately reflect the application's operating conditions.
- 2
Inspect the wiring for the PID feedback loop for any breaks, shorts, or incorrect connections, and correct any issues found.
- 3
Check the feedback sensor on the control side to ensure it is operating correctly and providing accurate readings; replace the sensor if it is damaged or faulty.
- 4
If the problem persists after verifying parameters, wiring, and the sensor, the feedback input circuit on the control board may be damaged, necessitating replacement of the control board or the entire drive unit.