// Case study — Recommissioning

Siemens 840D Recommissioning – Large Gear Cutting Machine

Large gear cutting machine in the workshop

Overview:

PNC completed the full recommissioning of a Siemens 840D-controlled gear cutting machine used for industrial spare parts production, including large gear components for heavy-duty applications. The machine supports gear cutting up to 2 meters in diameter and is equipped with a complete Siemens control and drive system.

The project was required after a drive-related failure caused system corruption and a complete loss of machine data from the control card. PNC restored the machine by rebuilding the required CNC parameters, checking the Siemens drive system, recalibrating the axes, and validating the machine functions.

Scope of work included:

  • Siemens 840D CNC recommissioning
  • CNC parameter recovery and reconstruction
  • Siemens drive diagnostics and configuration
  • Axis and drive recalibration
  • Switch point and machine parameter setup
  • Electrical diagnostics and fault tracing
  • Functional testing and system validation

Result:

The machine was successfully restored to operational condition, bringing back reliable gear cutting capability and stable machine performance.

Keywords: Siemens 840D recommissioning, CNC parameter recovery, Siemens PLC, Siemens 840D diagnostics, CNC service, Siemens Powerline.