Obsolete Switchgear Replacement

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Upgrading critical switchgear to improve reliability and reduce downtime

Verbrec was engaged by Fortescue Metals Group to deliver detailed electrical and control system design for the upgrade of obsolete low-voltage switchgear at its Cloudbreak mining operations.

The project involved replacing legacy motor control and communication systems with Siemens SIMOCODE motor management units integrated via a PROFINET communication network. Verbrec’s scope focused on delivering a constructible, shutdown-ready design for the upgraded motor control centre, including MCC layout modifications, PLC configuration and network topology. The objective was to modernise the system while minimising operational disruption and supporting efficient execution during planned shutdown periods.

Cloudbreak

Pilbara mining operations upgrade location

2024–2026

Project delivery timeframe

PROFINET

Modern communication protocol replacing legacy DeviceNet

Designing a shutdown-ready upgrade strategy

The design approach was developed to minimise shutdown duration while maintaining cost efficiency and operational continuity.

Verbrec implemented a strategy that enabled significant preparatory work to be completed prior to shutdown by pre-installing selected components within cable spaces external to the MCC tiers. This reduced the volume of work required during critical shutdown windows and supported faster execution. The design also enabled a streamlined transition from DeviceNet to PROFINET, allowing the upgraded system to be brought back online efficiently with minimal disruption to ongoing operations.

Engineering for staged installation and controlled system cutover

The project required a practical design that could be executed within tight shutdown windows while maintaining system integrity throughout the upgrade process.

Verbrec delivered detailed electrical and control system design for the switchgear upgrade, including the integration of Siemens SIMOCODE components within MCC cable zones and the configuration of the associated PROFINET network. The design incorporated a detailed construction methodology and procurement-ready documentation to support efficient execution. Particular focus was placed on enabling a controlled cutover process, ensuring both legacy and new communication systems could be managed during transition and commissioning.

Issued-for-construction electrical and network drawings
Detailed construction methodology for shutdown execution
PCS scope of works for system integration and commissioning
Integration of Siemens SIMOCODE motor management systems
PROFINET network design and communication system upgrade

Reducing downtime and improving commissioning control

Minimising operational disruption while enabling a seamless system transition

The delivered design enabled Fortescue to significantly reduce shutdown duration by completing a large portion of installation and preparatory works ahead of planned outages. This approach improved execution efficiency and reduced risk during critical shutdown periods. The design also supported controlled commissioning by allowing DeviceNet and PROFINET systems to be managed concurrently during cutover, helping minimise the impact of issues and ensuring a smoother transition to the upgraded system.

– By combining staged installation with a controlled communication system transition, the upgrade delivered a more efficient shutdown process and a smoother path to commissioning.

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