Published: 19 June 2008  12:00 AM
Industry Channel: None
Source: The Engineer Online
Company: Lenze Ltd

In many industrial processes, for example when slowing or stopping a machine, kinetic energy is wasted by converting it into heat. The same can apply with potential energy in machinery such as inclined conveyors and lifts. Two new regenerative power supply  modules from Lenze take that energy and put it back into the mains, reducing energy consumption and reducing costs.  The new design suiting the 9400 servo drive range achieves a high degree of efficiency during both power supply and regenerative feedback.  This suits applications even where the regenerative power is relatively low.

The regenerative power supply modules (RPS) are available with two power ratings.  The smaller model delivers 15kW of power and is able to feed 7.5kW back into the mains.  The larger model supplies 27kW with 13.5kW available for power recovery.  They are ideal for use where either continuous (for example on unwinders) or cyclic braking energy is produced. Examples of cyclic braking include hoists and positioning drives.  Instead of converting the energy to heat via brake resistors, which is highly inefficient, this energy can be easily recovered.  As a result, energy efficiency is increased while running costs and CO² emissions are reduced.

The RPS modules belong to the Lenze L-force drive and automation platform.  They are designed for easy integration with the Lenze 9400 servo drives because, as modern servo drives machinery runs faster and faster, the amount of kinetic energy that can be saved is greater.  These savings can greatly influence the running and life cycle costs of a machine.

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