IndustrialDriveDataDrive Board & Diagnostic Database
Input rectifier / DC-link

Schneider ATV61 / ATV71 Input and DC-Link Path

Routes USF and OSF evidence through input phases, fuses, contactor, rectifier, precharge, DC-link capacitors, braking path and DC-bus measurement.

Functional path

Input supply
Disconnect / fuses
Contactor or line reactor
Rectifier
Precharge
DC-link capacitors
Brake chopper / resistor where fitted

Diagnostic signals and checkpoints

USF timingOSF timingInput voltage at terminalsDC-bus behaviourBrake resistor condition

Technician notes

  • Line-side evidence must be measured at the drive terminals.
  • Overvoltage during deceleration is usually a regeneration/ramp/brake-path question before it is a control-board question.