IndustrialDriveDataDrive Board & Diagnostic Database
Large-power VFD repair reference

Yaskawa 616G3 55 kW

A main-circuit reference for a 55 kW drive with three-phase rectification, DC-link capacitor bank, six IGBT arms and dedicated parallel protection/suppression elements across the switching devices.

Record facts

Power sectionThree-phase rectifier → DC link → six-switch inverter
Observed protection componentsMS1250D225P / MS1250D225N across IGBT arms
Auxiliary observationsCooling fans, contactor status and thermal detection circuits shown

Service notes

  • Parallel suppression/protection elements can affect bench observations during limited-current testing.
  • Do not interpret unexpected limited-current lamp behavior as a failed IGBT without accounting for the suppression path.

Related technical records

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.

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Pre-Power Checks After IGBT Module Replacement

A failed power module has been replaced, or a drive experienced a destructive power-stage event.

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