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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.
https://www.youtube.com/watch?v=x882vvX_L7Y
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.
Would a good quality fan works better ??
https://noctua.at/en/nf-a4x10-flx
I don't see why you need a fan at all using a temp switch.
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 fan on my vfd works when i press "run" and it turns the fan off 30 seconds or so after i press stop button.
Here is the parameter for the Danfoss VLT2800....
Attachment 453454
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.
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.
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.Quote:
Originally Posted by ericks2