446

External Pulse Input Disconnected

Fanuc · αi series AC Servo Motor

What does 446 mean?

This alarm signifies that the external pulse input line is disconnected. This will prevent proper external control or feedback to the system, halting operations that rely on external pulsing.

Common Causes

  • External pulse input signal line is disconnected

Repair Steps

  1. 1

    Connect the external pulse input signal correctly

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Verified technical data. Last updated: March 2026
Source: Fanuc αi series AC Servo Motor
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