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Improved power quality
Almost sinusoidal input current eliminates the need for additional harmonic filters or active filters on the input side
∙ Compatible with older design of motors allowing retrofit to existing system designs.
∙ Minimal impact of voltage reflection, allowing longer cable length between motor and drive.
∙ Multi-level medium voltage drives minimise stress on motor windings, eliminating the need for additional sine
Fans, pumps and compressors have load characteristics whereby the power consumed increases as a cubic law with
The optimum way to save energy with this type of load is to control the motor speed with a VFD. This is far more effective as it avoids the waste of energy when fluid flow rate is controlled using a valve or damper.Process control is improved by the use of more accurate, prompt and flexible control of the motor speed.
The inherent soft starting ability of a VFD reduces the impact on the network (voltage dips) caused by high starting currents.
Substantially greater starting torques can be achieved with a VFD than with a soft starter and with much lower starting current, reducing stress on the motor windings and saving energy.The controlled start-up acceleration rate also reduces themechanical stress on the load equipment.
∙ The VFD operates at a higher input power factor than a directly connected asynchronous motor.
∙ The losses in the VFD converter are low, only 1.5% excluding the transformer.
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