Yaskawa CIMR‑MT3‑7.5K is a 7.5 kW AC spindle drive transistor inverter used in CNC and machining applications, operating on 380–480 V three‑phase input. Common failure points include burnt or tripped IGBT modules, degraded gate driver boards, overheating of the power MOSFETs, and capacitor failures in the DC link; motor winding insulation breakdown can also trigger overcurrent protection. First‑check diagnostics: verify 3‑phase supply voltage and phase balance, inspect all fuses and circuit breakers for continuity, and examine the drive’s diagnostic LEDs or error code display for fault indications; perform a visual inspection of heat sinks, ventilation, and any visible signs of component damage.[oss-gpt-20b]