43

Encoder fault

Vacon · NX Liquid-Cooled Drive

What does 43 mean?

A problem has been detected in the encoder signals. Subcodes in T.14 specify the issue: S1 (Encoder 1 channel A missing), S2 (Encoder 1 channel B missing), S3 (Both encoder channels missing), S4 (Encoder reversed), S5 (Encoder board missing), S6 (Serial communication fault), S7 (Channel A/B mismatch), S8 (Resolver/Motor pole pair mismatch), or S9 (Missed start angle).

Common Causes

  • Encoder signal loss or corruption.
  • Encoder connection faulty or disconnected.
  • Encoder power supply out of range.
  • Encoder internal fault detected.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check all encoder channel connections at both the drive's input terminals and the encoder itself for integrity and proper signal transmission.

  2. 2

    Inspect the encoder board for correct seating within its slot and any signs of physical damage.

Browse all codes in this manual (52)
Verified technical data. Last updated: March 2026

Related Faults

Source: Vacon NX Liquid-Cooled Drive