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Some doubts regarding VSDs


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  • 1 month later...

hello lalmehal

1) Capacitors must not be installed on the output of a VSD because the output voltage is made up of a high frequency PWM switching waveform. Connecting a capacitor would result in very high currents into the capacitor which would damage both the capacitor and the VSD.

2) Depends on the design, but as the ambient temperature is increased above 40 degrees C, you need to derate the drive to prevent the power devices from being overheated.

3) Very dependant on the load curve etc.


Best reards,

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Re: Question #1, the real question should be back to you. Why would you want to connect capacitors on the output of a VFD? A VFD will present a .95 power factor to the line, regardless of load on the motor. Why bother with any more capacitors?
"He's not dead, he's just pinin' for the fjords!"
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