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Thread: VFD Noise

  1. #1
    Join Date
    Jun 2005
    Location
    Helensburgh
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    7,696

    Default VFD Noise

    The noise VFD's make is not my favorite thing and I came across this the other day and I reckon it is a winner.




    The VFD on my drill is going to be operated on with a pair of side cutters and the one on the cyclone will get a temperature switch.
    CHRIS

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  3. #2
    Join Date
    Oct 2016
    Location
    Melbourne
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    Default

    Would a good quality fan works better ??

    https://noctua.at/en/nf-a4x10-flx

  4. #3
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    Default

    I don't see why you need a fan at all using a temp switch.
    CHRIS

  5. #4
    Join Date
    Dec 2017
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    Aldinga Beach
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    Default

    The fan has to be there However most drives i work with, the fan only starts when the heat sink temp goes over a preset value.

  6. #5
    Join Date
    Oct 2016
    Location
    Melbourne
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    Default

    The fan on my vfd works when i press "run" and it turns the fan off 30 seconds or so after i press stop button.

  7. #6
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    Dec 2017
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    Default

    Here is the parameter for the Danfoss VLT2800....

    danfoss.jpg

  8. #7
    Join Date
    Feb 2006
    Location
    Perth
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    27,756

    Default

    Good idea if you have a VFD with a noisy fan but I'd like to hear/see some SPLs

    Here are my readings taken at operator ear height or 1m from VFD in the case of the DC VFD

    Ambient : 43 dBA

    Belt sander:
    3HP HY exposed to shed;
    VFD Fan runs continuously
    58 dBA

    MW lathe:
    1.5HP Powtran 160 VFD is located inside a plastic power tool case for protection with 12V super-quiet computer case fan.
    The 160 fan only runs when the VFD is powering the motor
    The 12V computer case fan suns continuously
    44 dBA ie almost silent

    MW mill
    The2VFDs: 1 x 1.5HP Powtran 160 and 1 x 0.5HP Powtran 130 VFDs located under/inside mill cabinet
    The fans on both units only run their fans when motors are running
    Cabinet vented by a super quiet 240 V fan that runs continuously when VFDs are on
    44 dBA ie almost silent

    DP
    1.5HP Powtran 160:
    Same situation and setup as the MW lathe
    44dB ie almost silent

    BS
    4HP HY exposed to shed;
    VFD Fan runs continuously
    58 dBA - slight irritation

    Grinders
    1.5HP HY exposed to shed;
    VFD Fan runs continuously
    54 dBA - see comment below

    WW lathe
    1HP Powtran PI130 exposed to shed;
    VFD Fan only runs when the VFD is powering the motor
    No issue

    DC
    4HP HY exposed to shed;
    VFD Fan runs continuously
    50dB ie no irritation as I'm usually further than 1m from this VFD

    1/4HP 1200 CFM shed extractor.
    1/2HP used VFD - this unit has no fan at all.
    no issue

    Although its not the loudest the most irritating of these is the Grinder VFD, and I'm pretty sure it's because there's a noisy (buzzing) relay in the switching.

    As you can see I am slowly upgrading to Powtran VFDs but I am in no hurry to upgrade the existing HYs as they don't bother me.

  9. #8
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    Jun 2005
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    Helensburgh
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    Default

    Bob, noise affects different people in different ways and SPL's are irrelevant when that is the case. Both mine are Powtran and the fan noise from both is extremely irritating to me. It is good you don't find them irritating as that will save you having to address the issue.
    CHRIS

  10. #9
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    Location
    Helensburgh
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    Default

    Quote Originally Posted by ericks2 View Post
    The fan has to be there However most drives i work with, the fan only starts when the heat sink temp goes over a preset value.
    The fans on all the VFD's I am familiar with work all the time, I guess it saves them having to put temperature switching in.
    CHRIS

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