Siemens SINAMICS G120 Error Code F31115

Siemens PLC & VFD Major Encoder

Model: SINAMICS G120 | Code: F31115

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

Symptoms

Encoder feedback lost: motor feedback signal dropout.

Possible Causes

  • Encoder cable intermittent
  • Feedback sensor fault
  • Signal noise

Troubleshooting Steps

  1. Step 1: Check encoder cable and connector
    Secure and intact
  2. Step 2: Verify feedback signal
    Signal stable
  3. Step 3: Shield encoder cable
    No signal dropout

How to Reset

Reset via operator panel after feedback is restored.

Related Siemens Fault Codes

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Source: Siemens SINAMICS G120 List Manual

Category: PLC & VFD