Siemens SINAMICS G120 Error Code F31151

Siemens PLC & VFD Major Encoder

Model: SINAMICS G120 | Code: F31151

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

Symptoms

Encoder undervoltage: encoder supply voltage too low.

Possible Causes

  • Encoder power supply too low
  • Wiring fault
  • Encoder overloaded

Troubleshooting Steps

  1. Step 1: Check encoder supply voltage
    Voltage within rated range
  2. Step 2: Inspect encoder power wiring
    Wiring intact
  3. Step 3: Verify encoder power consumption
    Current within rated range

How to Reset

Reset via operator panel after encoder voltage is corrected.

Related Siemens Fault Codes

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Source: Siemens SINAMICS G120 List Manual

Category: PLC & VFD