Analog In Loss

What does 29 mean?

An analog input signal, which is vital for drive control, has been lost or is outside its expected range. This condition, if not addressed, can be configured (via P263 [Anlg In0 LssActn]) to stop the drive. It typically indicates a wiring issue, sensor failure, or a problem with the signal source, leading to a loss of critical control feedback.

• Loss of 4-20mA or 0-10VDC input signal due to a broken wire or disconnected terminal (e.g., 'AI0' or 'COM').
• Analog input signal voltage/current falling below the programmed minimum threshold (e.g., P260 [Anlg In0 Min]).
• External sensor or transducer failure providing the analog signal (e.g., pressure transducer outputting 0mA).
• Improper scaling of the analog input parameter (e.g., P261 [Anlg In0 Max]) causing out-of-range detection.
• Faulty analog input channel on the drive's control board.

Click steps to track your progress.

1. 1

   1. Measure the voltage (0-10VDC) or current (4-20mA) at the drive's analog input terminals (e.g., 'AI0' and 'COM') to verify signal presence.

2. 2

   2. Inspect the analog input wiring for breaks, loose connections, or corrosion at both the sensor/source and drive terminals.

3. 3

   3. Verify the external sensor/transducer operation and its output signal using a calibrated multimeter at the sensor output terminals.

4. 4

   4. Check P260 (Anlg In0 Min) and P261 (Anlg In0 Max) parameters to ensure the expected analog signal range is correctly defined.

5. 5

   5. If the signal is confirmed good at the drive terminals but the fault persists, swap to an alternate analog input channel (if available) or replace the control board.

6. 6

   6. Confirm P263 (Anlg In0 LssActn) is set appropriately for the desired drive response to analog input loss.