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Benefits of VFDs, Inverters, Drives

Posted by Craig Hartman 20/03/2014 9 Comment(s)


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9 Comment(s)

25/10/2017, 05:08:47 AM

This is a brilliant post.
I have a little question about motors under vsd control.
Suppose I have a pump driven by a 150kW motor and controlled by a vsd controller. In a 400v 3 phase system, what will be the approximate current drawn from the line when the motor is running at full speed?
This may sound naive, but I am asking because I want know if the vsd will help in reducing the current when the motor is at full speed/

Thanks in advance.

Yin (Admin):
21/02/2018, 01:33:57 PM

Hey Mark,

For a 150kW (200HP) at 400V, it is about 220-240A. But at full speed, it is basically running across the line. You will get little to no energy savings. Energy savings only happens when you run at below 100% speed. Hope that helps.


Eric Johnson:
13/06/2017, 05:09:52 PM

Can a conventional air conditioning unit be converted to a vsd cost effectively without having to change out the complete system?

gordon sanstad:
14/04/2017, 07:43:00 PM

I heard about VFDs as a way to convert single phase power to 3 phase, yet that is not mentioned at all here. Was I misinformed?

Yin (Admin):
17/04/2017, 11:37:16 AM


VFDs can indeed convert single phase input to three phase output with some limitations. However, it is not the main purpose of the VFD invention, that is why it was not mentioned in the article.

shafqat zaman:
28/09/2016, 12:56:08 AM

I inspired from your writing. This is knowledgeable and help alot to new learner.

hobi masak:
24/08/2015, 12:36:38 AM, hobimasak.mywapblog.com

I will come back to your site to read more articles are certainly more interesting.

24/08/2015, 12:35:11 AM, resepnyah.bravesites.com

Greetings to all, I really love your writing this because it is very inspiring for the crowd.

24/08/2015, 12:33:51 AM, ahliresep.tumblr.com

very pleasant at all can be present here to listen to all of your article

kakak tua:
24/08/2015, 12:32:58 AM, dapurcantik.jigsy.com

thanks for sharing, I just know things like that after reading this information from you

23/12/2014, 10:10:33 AM

Where was this article when I started in controls? Would have saved me a lot of headache. Thanks

23/12/2014, 04:14:00 PM

You are welcome Chris! Let us know if there are any specific topics you would like us to write about!