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Installing an inverter-driven screw compressor can assist in achieving reductions in compressed-air-related energy costs by up to 22 per cent, according to S and L Engineering.

The amount of compressed air needed during a given day or week varies depending on production.

Variations in the amount of compressed air required cause corresponding variations in line pressure.

Pressure variation is detected by the compressor delivery pressure sensor, which processes the signal and transmits it to the control system.

The machine varies motor speed and keeps line pressure constant, adjusting automatically according to consumption.

This means it only supplies the amount of compressed air required by the system.

The motor speed is regulated by varying the electric motor feed frequency.

Every restart of the electric motor using the inverter is ramped, with limited current.

This means an unlimited number of start-ups can be performed, unlike traditional compressors with direct or ASD start-up.

Inverter-based compressors offer lower running costs and only use energy for air production.

No energy is wasted on partial loading and they maintain a constant pressure.

Other features include: lower energy consumption; higher process stability; lower maximum pressure; lower energy consumption for lowest maximum pressure; reduced compressed air leaks; constant power factor; no need for rephasing; and low stress on coupling elements.

S and L Engineering

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