Electrical panel building service

Varispeed E7

The Yaskawa Varispeed E7 variable frequency inverter drive has been superseded by the A1000 range, please contact us for advice on replacement equivalents and transition guides. 

The E7 was a super energy saving variable-speed inverter drive. 0.55-110kW single phase, 0.55-300kW three phase. Ideal drive for fans, pumps, etc.

  • The integrated PI controller is optimised to HVAC demands and can be easily adjusted to control temperature, flow or pressure (including differential pressure).
  • High speed current limiting function allows virtually uninterrupted operation.
  • Extremely smooth and quiet operation.
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How does an inverter work?

An inverter when used in the context of motor speed control can also be known as a variable frequency drive (VFD). It essentially generates a varying frequency three phase AC voltage to effect a change in the speed of a motor. It achieves this by converting the incoming power supply into a DC voltage and then generating a three phase AC voltage from this DC supply. The development of electronics since the manufacture of the first semiconductors has seen the speed and processing power increase enormously which has made it possible to, not only digitally synthesise the required AC frequency for any given speed of the motor but to also analyse the motor current and rotor position.

Why is it called an inverter?

The term inverter only relates to the final part of the VFD's electronic architecture, the part that converts DC voltage to AC. There is no clear technical reason for the use of the term 'inverter' as it is generally believed to refer to the inversion of the early mechanical process of converting AC voltage to DC, sometimes referred to as an 'inverting converter'.

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