Harmonics
Harmonics
(OP)
Sorry, i am not a big PQ guy, we have this new fan in our shop www.bigassfans.com
It is making some high pitched noise that varies with speed and is not mechanical. I hooked up my Arbiter 928A and am seeing 26V on the 3rd harmonic regardless of 1st harmonic voltage (Speed), based on speed the supply voltage varies from 30V-something higher than 100V, I cant turn the thing past speed 5 (Goes up to 10) or I will have a huge mess to clean up io the shop (24' diameter fan).
Any PQ gurus out there who can explain the source of the noise?
It is making some high pitched noise that varies with speed and is not mechanical. I hooked up my Arbiter 928A and am seeing 26V on the 3rd harmonic regardless of 1st harmonic voltage (Speed), based on speed the supply voltage varies from 30V-something higher than 100V, I cant turn the thing past speed 5 (Goes up to 10) or I will have a huge mess to clean up io the shop (24' diameter fan).
Any PQ gurus out there who can explain the source of the noise?






RE: Harmonics
That sound is from the VFD. You may try to adjust the carrier (switching) frequency so you won't hear it any more. But, if you are relatively young, you will need to set frequency to about 16 kHz. And that usually means you have to degrade the drive.
All this only if there is a VFD, of course.
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Harmonics
The Big Ass Technical support (Thats what they are really called so dont red flasg me) had me adjust the carrier freq as high as the VFD would go and we are still having the problem.
RE: Harmonics
RE: Harmonics
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Harmonics
I dont have db meters, but it is audible over some fairly loud classic rock on the radio.
RE: Harmonics
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Harmonics
RE: Harmonics
What say you now gentlemen??
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Harmonics
Using a cheap sound level meter set to A weighting makes it easier to see what I'm hearing.
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