Yaskawa GA700 Error Code STo

Yaskawa PLC & VFD Critical Safety

Model: GA700 | Code: STo

Applicable Systems
GA700 GA500 A1000 V1000 J1000

Symptoms

Safe Torque Off activated: safety function engaged.

Possible Causes

  • STO input activated
  • Safety command received
  • Emergency stop triggered

Troubleshooting Steps

  1. Step 1: Check STO input signal
    STO input inactive when safe
  2. Step 2: Verify emergency stop circuit
    Circuit normal
  3. Step 3: Clear safety command
    Command cleared

How to Reset

Reset by clearing STO command and acknowledging fault.

Related Yaskawa Fault Codes

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Source: Yaskawa GA700 Technical Manual, Yaskawa Electric

Category: PLC & VFD