Nabtesco servo drives are high‑precision AC motor controllers that deliver closed‑loop speed and position control for industrial motion systems. Common failure points in this class of equipment include power supply degradation, insulation breakdown between windings, phase imbalance or loss of feedback signal from the encoder/resolver, as well as overheating due to inadequate cooling or overcurrent conditions. For initial troubleshooting, verify the incoming AC voltage and phase sequence, inspect all I/O terminals for loose connections or corrosion, and review any error codes displayed on the drive’s diagnostic panel before proceeding with deeper electrical or mechanical inspections.[oss-gpt-20b]