IndustrialDriveDataDrive Board & Diagnostic Database
Power topology

Standard AC Drive Power Conversion Path

Most voltage-source AC drives follow a common conversion chain: mains input is rectified to a DC bus, filtered by the DC-link stage and switched through an inverter bridge to produce a controlled three-phase motor output.

Functional path

AC input
Rectifier
DC-link capacitors / reactor
IGBT inverter bridge
U / V / W motor output

Diagnostic signals and checkpoints

DC-bus charge stateInput/output terminal identificationGrounding and shielding integrityCooling and derating conditions

Technician notes

  • The input supply must never be connected to U, V or W output terminals.
  • Power-stage topology may be common across drives, but terminal layouts and auxiliary functions must be verified per model and frame.
Evidence intake

Turn this record into a qualified service request

A repair decision is much more reliable when the request includes the exact identity of the drive, the first fault evidence and the machine condition when the symptom appeared.

  • Complete drive type code / MLFB or nameplate model
  • Fault code, fault value and first event before reset
  • When the event appears: power-up, enable, ramp, run, decel or stop
  • Motor/cable connected or isolated during the symptom
  • Visible board, option-card, module and connector identifiers
  • Previous repair history, replacement parts and repeat-failure pattern
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