Control contract signed for major coal mine
A
Control Techniques product story
Edited by the Engineeringtalk editorial team
Mar 14, 2008
ATB Sever provided the customer with a complete turnkey solution including electrical control panels, software, motors and all electrical and commissioning works on site.
Heavy-duty AC drives from Control Techniques, Emerson Industrial Automation have been chosen for a major open-cast coal mining project in Kostolac, some 90km south-east of Belgrade.
This contract was won by Control Techniques' local Drives Specialists, Master Inzenjering of Subotica and their long-term system partner and motor manufacturer, ATB Sever.
Petar Mikovic, Project Manager of ATB Sever said, "Our close working relationship with Control Techniques and Master Engineering combined with our experience of such schemes and our customer support all contributed to winning the contract".
ATB Sever provided the customer with a complete turnkey solution including electrical control panels, software, motors and all electrical and commissioning works on site.
The government owned Te-Ko Kostolac mine is the second largest open-cast coal mine in Serbia and supplies an adjacent coal-fired power station.
The application is for the drive and control of a massive two-part conveyor system, used to remove the earth and rock scoured from above the coal seams.
Four 315kW Unidrive SP free-standing drives have been supplied, each fitted with a Profibus module that communicates directly with the central PLC and ESA HMI panels.
The compact, modular drives are installed in the electrical switch-room mounted on the conveyor station.
The four drives operate in Control Techniques' open-loop RFC mode and control two pinch-drums, with one 315kW, 1490rev/min motor at each end of each drum.
The control system monitors the load and adjusts the drives' speed to ensure an even distribution of motor power.
The system has been designed to operate on three, or even two, motors in the event of a failure.
Most of the time, the conveyors run at full speed, 50Hz/4.5m/sec, but operates at reduced speed during periods of light load to save energy.
Diggers load earth onto the 1.6m-wide loading conveyor system, which carries the load onto a dispensing conveyor.
Both conveyors can be moved to where they are needed by a caterpillar system and the total length can be up to 2km.
The load during the 24-hour operation is fairly even, depending on the nature of the earth and rock being loaded, with capacity varying between 3000 and 5000 tonnes per hour.
The Unidrive SP cubicle drives, built at Control Techniques' factory in Newtown, Powys span the range from 90 to 675kW, offering customers a simple AC-in AC-out solution.
The Unidrive SP free-standing cubicles offer a pre-engineered solution with a small space envelope.
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