The Infranor SMIBSIC‑220/30 is a brushless servo drive rated for 220 V AC input and up to 15–30 A output current, commonly used in machine tools and robotics with EtherCAT/CANopen interfaces. Typical failure modes include overheating of the power MOSFET array, insulation breakdown between high‑voltage windings, and loss of communication due to corrupted firmware or bad I/O connectors; a common symptom is an “overcurrent” or “communication error” fault code on the drive’s display. First‑check diagnostics: verify 220 V supply voltage and ripple with a multimeter, inspect the MOSFETs and heat sink for thermal damage, and confirm all communication cables (EtherCAT/CAN) are seated and free of corrosion; then review the drive’s error log via its web interface or serial console.[oss-gpt-20b]