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VSD with pf correction and passive filter


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#1 Daniel

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Posted 04 December 2003 - 05:14 PM

Can I use a capacitor with passive filter to improve the pf of the motorwith a VSD?;p;

#2 marke

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Posted 04 December 2003 - 06:35 PM

Hello Daniel

1. You must never connect any form of capacitor on the output of a VSD or soft starter without the manufacturers approval.
2. The power factor seen by the supply when using a VSD with a motor, is that of the VSD, the power factor of the motor is irrelevant due to the DC link.
3. The power factor of a VSD varies, but is less than 1 due to the presence of harmonics, rather than inductive current. To improve the power factor of a VSD, you need to use a filter in series with the input. This can range from a simple line reactor to a comples filter assembly, depending on the specifications required. - talk to the VSD manufacturer.

Best regards,




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