Allen-Bradley PowerFlex 4 and PowerFlex 40 AC Drives

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.