IndustrialDriveDataDrive Board & Diagnostic Database
DC-link energy and ramp-control path

Siemens MICROMASTER DC-Link, Ramp and Regeneration Path

Maps the field evidence path for MICROMASTER F0001/F0002 events: mains rectification, DC-link storage, ramp generator demand, load inertia, braking/regen behaviour and the inverter output stage.

Functional path

AC input
Rectifier / DC bus
DC-link capacitors
Ramp generator and current/voltage limiting
IGBT inverter bridge
Fan/pump load

Diagnostic signals and checkpoints

F0001 overcurrentF0002 overvoltageA0501 current limitA0502 overvoltage limitP1120/P1121 ramp timesP1135 OFF3 ramp time

Technician notes

  • A short ramp can create both current-limit and overvoltage symptoms; treat ramp energy and mechanical load as one diagnostic event.
  • For fan and pump drives, the application mechanics often matter as much as the fault code: inertia, dampers, valves, and process back pressure change the DC-link result.