446

External Pulse Input Disconnected

Fanuc · Alpha i 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 & Checklist

Click steps to track your progress.

  1. 1

    Connect the external pulse input signal correctly

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Verified technical data. Last updated: March 2026

Related Faults

414DC Link Low Voltage224Reference Position Not Established (ZRTN=0)251Invalid Input Data 2
Source: Fanuc Alpha i series AC Servo Motor
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