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An inverter, or variable speed drive (VSD speed variator), in principle is an electronic device supplied directly from the power line that, through a sophisticated control, allows to change the frequency and the amplitude of the voltage supply of a three phase (or single phase) asynchronous electrical motor and consequently, allows to change its rotation speed. These devices are generally used to drive asynchronous motor in the auto-motive field, industry and since some years also in the pumps field, in order to get optional performances with the best possible energetic efficiency.

The Electroil’s inverters range includes a wide types of products designed to control the feedback pressure of centrifugal pumps in systems in which it’s important to keep the constant pressure control and at the same time contain the operating costs and ensure a longer mechanical and electrical longevity of all the components of the system.

Thanks to the variety of available inverter powers and to the possibility to connect in a group more pumps driven by inverters, the systems with Electroil inverters are generally used for an optimal pressure regulation on the waterworks systems in which is requested the maximum efficiency, therefore the maximum energy saving.

Thanks to an optimized current control, to the speed regulation, to the soft starting and stopping ramps and to the absence of water hammering of the typical traditional systems, our inverters also allow a silent working and an extension of the pumps life. By driving the system through inverter, the use of the membrane tank is recommended, but  it’s enough to use a membrane tank having a very small volume as it works, by maintaining the water under pressure, only during the transient elapses between the opening of a waterworks valve and the start of the pump with the reaching, in ramp, of the speed leading to the reference set pressure.