Siemens SINAMICS G120 Error Code F31134

Siemens PLC & VFD Major Encoder

Model: SINAMICS G120 | Code: F31134

Applicable Systems
S7-1200 S7-1500 S7-300 S7-400 LOGO! SINAMICS

Symptoms

Encoder signal unstable: signal jitter or noise detected.

Possible Causes

  • Signal interference
  • Encoder cable shielding inadequate
  • Encoder bearing wear

Troubleshooting Steps

  1. Step 1: Check encoder cable shielding
    Shield properly grounded
  2. Step 2: Eliminate EMI sources
    No interference
  3. Step 3: Verify signal with oscilloscope
    Signal clean and stable

How to Reset

Reset via operator panel after signal stabilizes.

Related Siemens Fault Codes

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Source: Siemens SINAMICS G120 List Manual

Category: PLC & VFD