IndustrialDriveDataDrive Board & Diagnostic Database
Inverter output / closed-loop control

Unidrive Output Current, Vector Control and Feedback Path

Routes OI.AC and unstable closed-loop behaviour through motor cable, output bridge, current feedback, brake release, encoder feedback, shielding and tuning context.

Functional path

PWM output bridge
Current feedback
Motor cable
Motor / brake
Encoder
Feedback option module
Vector-control loop

Diagnostic signals and checkpoints

OI.AC timingBrake releaseEncoder signalFeedback directionLoad conditionCurrent loop stability

Technician notes

  • A feedback fault can produce current trips even when the power stage is healthy.
  • Hoist and winder applications need mechanical/brake evidence as well as drive evidence.