PI Feedback Loss Fault
Yaskawa · E7 Drive
What does PIFB-FL mean?
This fault occurs when the PI function's feedback signal is determined to be lost, as configured by parameter b5-12 set to '2: Fault'. Upon detection, the drive will coast to a stop and energize the fault output (MA-MB), indicating a critical loss of process control feedback that requires immediate attention.
Complete Troubleshooting Guide
- 1
Check the wiring and connections of the PI feedback sensor to the drive's analog input terminals for integrity.
- 2
Verify the feedback sensor is powered and functioning correctly, providing a valid signal within its specified range.
- 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
Confirm the fault output relay (MA-MB) is wired and functioning correctly to signal external systems or safety circuits.