Modernising Cable Lines

Modernising Cable Lines: Replacing Slip-Rings with Wireless FMS Technology


Haggie Wire and Strand is a leading South African manufacturer and supplier of concrete reinforcing products. Established in 1921, the company has grown and evolved over the years to become a leading supplier of high-quality Wire products.

With a strong commitment to innovation and customer service in today’s fast-paced manufacturing industry, upgrading their machines is a necessary step for improving efficiency, productivity, and safety. One of the major challenges faced by Haggie Wire and Strand is maintaining ageing equipment that is prone to breakdowns. Here we will discuss how SA Power has assisted with the upgrading of some of their machines, the process involved while maintaining production demand.

The necessity to upgrade

The rotating cable machines were using traditional slip ring systems. These require frequent servicing and regular inspection of the brushes on the slip rings. They are prone to mechanical wear and tear.

The FMS system provided a wireless solution replacing the slip rings. It is a low-maintenance system only requiring the recharging and replacement of remote batteries on a four-day cycle.


First step was preparing the functional specification

The first step when proposing such solutions is the preparation of the Functional Specification. This is carried out in close collaboration between Engineers from Haggie Wire and Strand and SA Power and clearly defines the requirements and expectations of the upgrade. In addition, the role of each party during the upgrade. This is essential to manage communication and expectations.

In this case it required the replacement of slip-rings with a wireless solution.

Once the FS is completed, budgets, orders and resources are allocated to undertake the upgrade.

Upgrade using FMS

The upgrade involved removing the slip rings and installing two FMS Cradle Guard receivers between the six Cradles. An FMS Cradle Guard transmitter was installed at each Cradle. All safety proxies and line break proxies were wired from the pintle to each transmitter on each Cradle. Extended antennas were also installed for a better signal strength.

The Receivers outputs were wired into the machine safety and other signals which were tested and certified completing the upgrade.

Key success factors

During the upgrade process, it is essential to maintain productivity and meet demand to avoid any significant disruptions to the production process. This was done by carrying out the upgrade in phases where only a section of the machines was taken offline at any given time.

The upgrade process was planned for off-peak production periods to minimise the impact on production levels.

In summary

SA Power with their range of products, experience and engineering know-how, are well placed to upgrade old technologies with newer more efficient technologies. This is a key part of our business and business success.

Working together with the Engineers at Haggie Wire and Strand created the opportunity to clearly define expectations with the FS, plan the upgrade process to minimise production disruptions and provide a solution using the latest FMS technologies.

At SA Power we gauge our success on achieving such results and we thank the Haggie Wire and Strand team for their input and efforts to a successful upgrade.

In conclusion, upgrading client machines is a necessary step for improving efficiency, productivity, and safety in the manufacturing industry. The upgrade process involves securing necessary resources, removing old systems, and installing new systems. Strategies for maintaining productivity and meeting demand during the upgrade process include carrying out the upgrade in phases and scheduling the upgrade process during off-peak production periods. By implementing these strategies, manufacturers can upgrade their client machines while minimising the impact on production levels.

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