Analog Input Loss

What does F29 mean?

This fault occurs when an analog input, configured to fault upon signal loss, loses its expected input signal. This means the drive is no longer receiving a valid reference from the analog source (e.g., 0-10V or 4-20mA). This is an Auto-Reset/Run type fault configurable with parameters A092 and A093.

• Break or poor connection in the analog signal wiring (e.g., 4-20mA loop, 0-10VDC source) to the drive input terminals (e.g., AIN1).
• Failure of the external analog signal source device (e.g., pressure transducer, potentiometer) not providing a valid output.
• Incorrect configuration of analog input parameters (e.g., P065 [Analog In Loss Act]) on the drive, triggering a fault too sensitively.
• Loss of the 24VDC power supply to the analog sensor or transducer, preventing it from generating a signal.
• Damaged analog input module or internal circuit on the drive itself.

Click steps to track your progress.

1. 1

   Measure the voltage (for 0-10V) or current (for 4-20mA) at the drive's analog input terminals (e.g., AIN1, AIN2) using a multimeter.

2. 2

   Verify the integrity of the analog input signal wiring by checking continuity and insulation resistance from the signal source to the drive terminals.

3. 3

   Confirm drive parameter P065 [Analog In Loss Act] is set to the desired fault action (e.g., 'Fault') and its trip level.

4. 4

   Inspect the external analog signal source device (e.g., transducer) for power supply and proper operation, measuring its output directly.

5. 5

   Check the drive's internal diagnostics for real-time analog input values to differentiate between external signal loss and drive input circuit failure.