PI Feedback Loss Alarm
Yaskawa · E7 Drive
What does PIFB-AL mean?
This alarm occurs when the PI function's feedback signal is determined to be lost, as configured by parameter b5-12 set to '1: Alarm'. The drive acknowledges the loss of feedback but continues to operate without stopping, and it does not energize the fault output (MA-MB), indicating a degraded control state rather than a critical shutdown.
Additional Steps
Steps 1–2 are listed in Priority Fix.
- 3
Review parameter b5-13 (PI Feedback Loss Detection Level) to ensure it's set appropriately for the expected feedback signal range and potential fluctuations.
- 4
Inspect the process being controlled to ensure the physical feedback variable (e.g., pressure, flow) is present and within normal operating limits.
- 5
Ensure the analog input configuration (e.g., H3-02 to H3-09) matches the type of feedback signal being used.