IndustrialDriveDataDrive Board & Diagnostic Database
Main power circuit

Yaskawa 616G3 55 kW Power Stage and Suppression Path

The 55 kW main circuit contains the expected rectifier, DC-link and inverter path, while also showing dedicated parallel suppression/protection devices across the IGBT arms and auxiliary fan/status detection wiring.

Functional path

R / S / T input
Rectification
Precharge and DC-link bank
Six IGBT switching arms
U / V / W output

Diagnostic signals and checkpoints

DC-link capacitor conditionPrecharge/contactor behaviorIGBT arm conditionSuppression element influence during bench testsCooling-fan status

Technician notes

  • Bench limited-current tests must account for the parallel protection network before declaring a shorted inverter arm.
  • Replacement of damaged power modules without checking the associated drive and suppression circuits risks repeat failure.