Applicable Systems
i500
Symptoms
STO (Safe Torque Off) activated: safety function engaged.
Possible Causes
- STO input activated
- Safety command received
- Emergency stop triggered
Troubleshooting Steps
- Step 1: Check STO input signal
STO input inactive when safe - Step 2: Verify emergency stop circuit
Circuit normal - Step 3: Clear safety command
Command cleared
How to Reset
Reset by clearing STO command and acknowledging fault.
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Source: Lenze i500 Frequency Inverter Manual, Lenze SE
Category: PLC & VFD
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