Cycloconverter control upgrade – Case study

  • Project: Cycloconverter control upgrade
  • Location: Italy
  • Application: Automation and control system design and installation

An Italian steel manufacturer chose Nidec Conversion to design and install an automation and control system for a cycloconverter modernization project.

Scope of Supply
  • ARTICS Control System cabinet
  • Automation PLC porting activities
  • System and installation engineering
  • Erection and commissioning
  • Project documentation and training
cycloconverter control upgrade
To upgrade and automate the cycloconverter in an Italian steel company’s hot strip mill

An Italian steel company wished to replace the original analog control system in its hot strip mill’s cycloconverter with a new, state-of-the-art digital control system. The cycloconverter – a Nidec SILCOVERT C drive originally commissioned in 2001 – powers the Nidec synchronous motor that drives the mill’s slab sizing press. This cycloconverter was originally selected because it provides the high-power, relatively low variable frequency three-phase currents needed to operate the variable speed motor used to power the press.

The steel company wanted to install and commission the new automation and control system with the motors left in place during a planned outage. It selected Nidec Conversion to perform the turnkey assignment.

ARTICS automation and control systems

While operationally obsolete, the 15-plus-year old cycloconverter in the hot strip mill still had significant life remaining. Nidec improved its long-term performance with a state-of-the-art ARTICS control system.

Nidec’s services included system and installation engineering, system erection, commissioning the Automation PLC Porting and training staff on the system’s operation. The completed system today provides stable and reliable performance, while working near the cycloconverter’s maximum admissible frequency – 20.66 Hz.

The new ARTICs control system offers multiple advantages over the older analog system.