Analog Input Loss

What does F29 mean?

This fault occurs when the drive detects a loss of the analog input signal, specifically when the input falls below 1V (for 0-10V input) or 2mA (for 4-20mA input). The signal loss event clears when the input rises above 1.5V or 3mA. This usually indicates an issue with the wiring to the analog input, a failure of the external sensor, or the analog signal source itself. If unresolved, the drive's speed reference may become erratic or stop, impacting process control.

Complete Troubleshooting Guide

1. 1

   Inspect the wiring for the analog input (I/O Terminal 13 for voltage, I/O Terminal 15 for current) for any loose connections, breaks, or shorts.

2. 2

   Verify the external sensor or controller providing the analog signal is powered and operating correctly. Measure its output directly at the source.

3. 3

   Measure the analog signal directly at the drive's input terminals to confirm it is present and above the specified recovery thresholds (1.5V or 3mA).

4. 4

   If using 0-10V input and the fault occurs at zero speed reference, ensure A110 [Anlg In 0-10V Lo] is set to a minimum of 20% (e.g., 2 volts) to avoid false fault triggers for zero reference.

5. 5

   Check A122 [Analog In Loss] setting to ensure the 'Fault (F29)' option is desired for the application.