EMHEATER Sine Wave Filter Product Range

Sine Wave Filters

TCGC offers the following EMHEATER VSD Sine Wave Filters products:

• EM-SWF3 (3-Phase 380V)
• EM-SWF5 (3-Phase 525V)

*From 0.75kW up to 630kW.

*Manufactured with Amp ratings according to specific requirement.

*Custom Voltage options and pricing available on request only.

AC motors operate at their peak efficiency when they run on clean sinusoidal power. VSD’s produce square waves that are modulated so that the pulse width of the square waves can be varied continuously (known as pulse width modulation – PWM). VSDs maintain fine control over the width and amplitude of the square waves so that they take on the appearance (as viewed on an oscilloscope) of good approximations of a sine wave. Yet, even the most sophisticated VSD’s fail to match the purity of a true sine wave. Installing a sine wave filter between the VSD and the motor itself ‘smooths’ the VSDs PWM signal and converts it into a nearly perfect sinusoidal power wave form. This then:

• reduces motor insulation stress and eliminates switching acoustic noise from the motor;
• prevents disturbing pulses from being transmitted to the motor;
• minimises eddy current losses in the motor, resulting in a cooler motor and thus extended motor lifetime;
• reduces capacitances in screened motor supply cables which cause high oscillating circuit currents through motor bearings, vaporising lubricant, and causing damage to the bearings (especially in motors above 50 kW);
• provides protection for the VSD (due to the lower pulse load being reflected in lower semiconductor losses).

To be installed for applications using older motors, applications in ‘aggressive’ environments, applications requiring frequent braking, 690V applications with general purpose motors and applications where cable lengths between the VSD and motor is 150 to 500 metres (can reach 3000 metres).

For more details on these products, please visit: https://www.emheater.co.za/peripherals/

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