Siemens SINAMICS G120 Error Code F31002

Siemens PLC & VFD Major Encoder

Model: SINAMICS G120 | Code: F31002

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

Symptoms

Encoder signal lost: signal dropout detected.

Possible Causes

  • Encoder cable intermittent
  • Encoder sensor fault
  • Signal noise

Troubleshooting Steps

  1. Step 1: Check encoder cable and connector
    Cable and connector secure
  2. Step 2: Verify signal stability
    Signal stable
  3. Step 3: Shield encoder cable
    No signal dropout

How to Reset

Reset via operator panel after encoder signal is restored.

Related Siemens Fault Codes

Source: Siemens SINAMICS G120 List Manual

Category: PLC & VFD