The continuous reduction of cost – and price – of VSDs have opened totally new drive applications, unimaginable two decades ago, from small machine tools to centrifuges used in honey production. It is only in recent years that the energy saving benefits of the VSD have become more prevalent and with that a new wave of applications has emerged. Of course, back in the 1970s, climate change or net-zero carbon dioxide emissions were a long way off anyone’s agenda. In the early days a VSD was a way of improving productivity by regulating the air or liquid flow rates or varying conveyor speeds and its benefits to energy efficiency were not particularly well known. By varying the speed, the VSD ensures that the flow of air or liquid can be more accurately fed into a process to meet the actual demand at that moment in time. Its purpose in life, from then to now, remains fundamentally the same: to vary the speed of standard AC induction motors, particularly those powering variable torque loads like pumps, fans and compressors. The variable speed drive (VSD) is now over 50 years old. Inverter Obsolescence and Maintenance Checkĭavid Hughes, Managing Director for ABB in the UK, reflects on the past, present and future of the ubiquitous variable speed drive as new generation of engineers are increasingly becoming aware of its advantages.Inverter Preventative Maintenance Schedule.ABB Ability Life Cycle Assessment for Variable Speed Drives.ABB ACQ580 Drive for Water and Wastewater.

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