FbH

PID Feedback Loss (High)

Yaskawa · iQpump1000 AC Drive

What does FbH mean?

The analog input programmed for PID feedback has risen above 21 mA. This occurs when the PI feedback source is incorrectly installed, not working, or has a wiring issue. The drive's response to this condition is controlled by parameters b5-12 and b5-13.

Common Causes

  • PI feedback source is incorrectly installed or not working
  • Analog input programmed for PID feedback has risen above 21 mA
  • Wiring issue in the PID feedback circuit

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Confirm that the PID feedback source is installed and working properly

  2. 2

    Verify the analog input signal for PID feedback is within the expected 3-21 mA range

  3. 3

    Check drive parameters b5-12 (Feedback Loss 4 to 20 mA Detection Selection) and b5-13 (Feedback Loss Go To Frequency) for drive response settings

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Verified technical data. Last updated: March 2026

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