IndustrialDriveDataDrive Board & Diagnostic Database
Schneider Electric fault record

OSF: DC Bus Overvoltage / Supply Overvoltage

The drive trips on OSF, often during deceleration, regenerative load, high line voltage or braking-resistor problems.

Meaning of the indication

The drive sees excessive DC-link voltage. The first boundary is line voltage, regeneration during decel, braking path and ramp configuration.

Checking order

  1. Record whether OSF occurs at idle, run, or deceleration.
  2. Measure input voltage at the drive terminals and compare with voltage class.
  3. Check deceleration time against inertia and load behaviour.
  4. Inspect braking resistor/chopper evidence where fitted.
  5. Identify regenerative loads such as hoists, centrifuges, winders and high-inertia fans.

Suspect areas

High incoming lineShort decel rampRegenerative loadBraking resistorBrake chopperDC-link measurement
Fault-specific caution

A DC-bus overvoltage event is hazardous; isolate and verify discharge before any internal inspection.

Diagnostic workflow

Workflow
Schneider ATV61 / ATV71 OSF and USF DC-Link Diagnostic Workflow

ATV61/ATV71 reports OSF overvoltage or USF undervoltage during power-up, run or deceleration.

Open →