BMG Drives distributes the Danfoss range of variable speed drives, which provide fully automated operation and substantial energy savings in diverse applications. VLT drives ensure easy and efficient control of any application powered by an AC motor. These applications include a fan, pump, compressor, centrifuge or hoist,” says Mick Baugh, electronics sales manager, BMG. “What sets these drives apart from conventional units is that they require less energy when idle or operating with partial loads.”
Enhanced automation capability
VLT drives, which have a customised programming facility, enable the user to increase plant automation capabilities. With this modular system – which encompasses specific power sizes, features, enclosure classes and fieldbus protocol – it can be determined on each plant what parameters are essential to meet specific requirements. Included in the VLT portfolio are new lift drives designed for quiet, comfortable and stable elevator operation.
Lift upgrade
A recent installation of this system was the upgrade of an ageing, unreliable lift. A modular Danfoss VLT lift drive LD 302, with optimised software to control the motor, as well as the hydraulic valves, was installed in the existing lift system and cabin. New components of the lift resulted in faster, more comfortable and energy efficient daily operation. This system has also reduced the operating noise levels of the lift.
Reduced line current
A new range of VLT line filters, which reduce line current by up to 40%, has also been launched on the local market. The MCC 107 line filters improve overall reliability of the system by combining a harmonic filter and an EMC filter.
By reducing the voltage ripple on the DC link, drive performance is enhanced, service life is extended and operational and maintenance costs are significantly reduced. These filters also reduce the RMS value of line current, which means higher true power factor (PF). Typically, line current can be reduced by 40% and the PF can improve from 0,4 to 0,7 for single-phase drives and from 0,5 to 0,9 for three-phase drives.
Outstanding EMC performance
These line filters ensure compliance with EN55011 Class A1 for up to 50 metres of motor cable and Class B up to 10 metres of motor cable. This means the VLT micro drive and VLT line filters have outstanding EMC performance in the micro-inverter class, even with relatively long motor cables. These line filters, with high immunity against grid disturbances, also reduce the harmonic current drawn from the grid. Another advantage is that one line filter can be used for filtering several small micro drives.
The VLT Flexconcept provides system manufacturers and end-users with fully integrated drive solutions to reduce running costs and maximise efficiency. The matched design of drive components has been designed for optimum energy efficiency to exceed current and projected EU motor efficiency standards in new, retrofit or modernised systems.This system, with fewer variants than conventional systems, simplifies project planning, installation, commissioning and maintenance.This is especially important in conveyor applications, irrespective of whether a centralised or decentralised plant design is required.
Special award
Danfoss has recently been presented with a prestigious Special Automation Ecohitech Award in Italy, in the ‘components, technologies and systems’ category. In the motivation for this award, the judges emphasised the balance between business productivity and environmental impact made possible by integrating mechanical components and advanced electronics.
Reduced power consumption
By optimising motors, gear units and frequency converters, it is now possible to reduce power consumption by up to 30%. The design of the Danfoss solution, which has been developed according to strict industry hygiene regulations, also meets the requirements of eco-compatibility of the system.
BMG Drives also provides a sales, training, repair, maintenance and spare parts service for the Danfoss range of electronic variable speed drive systems throughout southern Africa.
For more information contact Mick Baugh, BMG Drives, +27 (0)11 620 1538, [email protected], www.bmgworld.net
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