Tarmac, Dunbar Installs Custom Wireless Communication System

Unmanned Stacker & Reclaimer Machines Now Monitored Wirelessly

Elite Control Systems, a leading provider of systems integration services, announces the use of wireless technology to provide a solution for one of its key clients. The wireless system was installed on their large Stacker and Reclaimer machines located in a remote part of Tarmac’s Dunbar site in Scotland.

Plant operations

Raw material is transferred from the quarry onto the conveyor system that feeds into the Stacker. As the name suggests, this machine stacks the product in an even pile in readiness for future reclamation by the Reclaimer, which feeds the Raw Mill.

The unmanned Stacker and Reclaimer machines are located in a fairly remote area of the cement works and travels along a rail track, creating a consistent accumulation of raw material.

The Stacker will continue to transfer the raw material onto a uniform stockpile until it senses that the level of product has reached its required height. Once a pile has been built, it will be reclaimed by the Reclaimer and mixed with other raw materials before being ground into a raw meal in the Raw Mill.

New technology offers reliable wireless communication

When Tarmac asked Elite Control Systems to assist Siemens in providing them with a way to monitor the Stacker and Reclaimer’s activities through the plant’s existing control system, Elite devised a custom solution.

The standard way of connecting to remote machines, such as Tarmac’s Stacker and Reclaimer, would normally involve running new cables in what can often be considered as an expensive and disruptive installation procedure.

By utilising a wireless solution, most of this type of installation work was not required. The application did call for a thorough preliminary assessment involving an initial wireless audit. This was essential to ensure that the wireless solution could be implemented successfully in this instance.

Working closely alongside the manufacturer of the wireless equipment, Elite Control Systems carried out the wireless assessment of the area where the new system would be installed. Elite then proceeded to install the specified Siemens Scalance™ wireless communication system.

In this instance, the appropriate Industrial Wireless LAN (Scalance W786) components that comply with the required IEEE 802 standards were installed.

This work involved mounting the necessary wireless communication equipment at suitable points on the plant, Stacker and Reclaimer.  These devices continuously transmit signals directly from the machines.

This effectively provides the necessary status information and makes it possible for plant engineers to remotely monitor the desired machine parameters.

By further integrating this system into Tarmac’s existing site network, the status of the Stacker and Reclaimers is now able to be visually displayed in the main PCS7 system control room.