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ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

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

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

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000Power-Down Required Parameter011Zero Feedrate Specified013Maximum Feedrate Zero
Source: Fanuc Alpha i series AC Servo Motor
Open Manual (Page 230)Search more codes in this manual