This video showcases the Dee Valley Water (DVW) project to build a new water treatment works at its flagship site, Llwyn Onn in North Wales.
The £17M project was officially opened in March 2014 by the Minister for Natural Resources and Food, Alun Davies and is controlled by a Mitsubishi Electric system redundant, MELSEC Q series modular PLC solution.
A crucial aspect of the control system was the use of a full dual-redundant PLC system. Complete with its own CPU, the secondary system is fully wired-in and tested, increasing the system reliability by mirroring the primary CPU so that in the unlikely event of a failure of the main CPU, power supply or base unit, the secondary system can take over within 21 milliseconds from the same control point.
The new works provide DVW with the capacity to produce 47,000m3 of drinking water per day for Wrexham and the surrounding area. In addition to the standard treatment processes, Llwyn Onn also includes an automated processing system for removing manganese, a mineral that occurs naturally in the surface water of the DVW area.