Emergency call

A new HVAC system at BT’s centre for 999 calls in Nottingham, controlled by ABB drives, has reduced electricity costs by 23%. The site has also shown a reduction in gas usage to 12% of the previous figure, due to better control of the HVAC system.
The 18 drives, ranging in size from 5.5 to 30 kW, run air handling unit supply and extract air fans at the site. The drives sit on a BACnet network centred on ADT controllers. The BACnet network consists of a single twisted pair daisy-chained throughout the whole installation and relaying data between the user’s graphical front end and the drives. This data can include the energy consumption in kilowatt hours used by the drive, a very useful piece of information in keeping costs down.