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Fan Control Using TC4C
woodchuck
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Posted on 11/07/2014 12:49 PM
Not sure anyone else has this issue but I can't startup my fan at a low speed or it will stall. I have to jack it up to 100% then back off a second later to the correct value. Once started spinning there are no further issues. Not a big issue but just curious what others have found.

Cheers

Ian
Roasters: TJ-067, Hottop with TC4C and RAF Mods
Espresso: LaSpaziale VII/Macap M4 Grinder
Pour over: Bonmac Pro Cone
Press: Bodum
 
Barrie
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Posted on 11/07/2014 7:19 PM
Are the fan blades clean and not loaded with gummy stuff (technical term)? :-)
Barrie (San Diego, CA)
"So much to learn, so little time."
Hottop 2K+., Artisan, Jura Capresso ENA 3 (i.e. espresso).
 
HoldTheOnions
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Posted on 11/07/2014 7:38 PM
Yes, it has to overcome inertia initially, so higher then can turn it down. Is 100% equal to it's max operating voltage? If so, then sounds like maybe fan is bad, because most fans will start up at half their rated voltage or so. But if it's a 12v fan and only giving 7v, for example, then not much room to play with.
 
woodchuck
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Posted on 11/08/2014 7:32 AM
Actually it will start up with less than 100%. I just noticed it awhile ago when I built a profile that started with a 20% fan. No biggy I just ramp up and down quickly to where i really want to be.

Cheers

Ian
Roasters: TJ-067, Hottop with TC4C and RAF Mods
Espresso: LaSpaziale VII/Macap M4 Grinder
Pour over: Bonmac Pro Cone
Press: Bodum
 
JimG
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Posted on 11/08/2014 11:56 AM
Threshold for starting the fan is usually 15% to 25%. Depends on the fan. Also be careful to limit the fan inrush current:

http://www.mlgp-llc.com/htri/fan_notice.html

Jim
 
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woodchuck
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Posted on 11/10/2014 9:15 AM
Jim thanks for this.

Cheers

Ian
Roasters: TJ-067, Hottop with TC4C and RAF Mods
Espresso: LaSpaziale VII/Macap M4 Grinder
Pour over: Bonmac Pro Cone
Press: Bodum
 
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