Analog Input Loss

Was bedeutet F29 ?

This fault indicates that the drive has detected a loss or out-of-range condition on the analog input signal used for speed reference. The fault is generated when parameter A122 (Analog In Loss) is explicitly configured to trigger a fault on loss of signal. This can be caused by disconnected wiring, a faulty analog sensor/source, or an incorrect analog signal level at the drive input terminals.

• Loss of analog input signal (e.g., speed reference, process value).
• Analog input signal outside acceptable range (e.g., 0V).
• Wiring fault for the analog input.
• Signal generator failure.

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1. 1

   Verify parameter A122 (Analog In Loss) setting — ensure it is set to 'Fault (F29)' if a fault response is desired, otherwise, it may be set to 'Disabled' or another action.

2. 2

   Measure the voltage signal at I/O Terminals 13 (0-10V In) or the current signal at I/O Terminals 15 (4-20mA In) relative to I/O Terminal 14 (Analog Common) — confirm the signal is present and within the expected operational range (e.g., above 0V for 0-10V input, or above 4mA for 4-20mA input).

3. 3

   Check the continuity and integrity of the wiring between the external analog signal source and the drive's analog input terminals (13, 14, 15).

4. 4

   Test the external analog signal source (e.g., potentiometer, sensor) independently to ensure it is powered, functional, and providing a stable output signal within its specified range.