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Homeroasters - Home Roasting Coffee Community » ALL ABOUT ROASTERS » HotTop Roaster

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Fan Control Using TC4C
woodchuck	#1 Posted on 11/07/2014 12:49 PM
Newbie Posts: 43 Joined: May 29, 2014	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	#2 Posted on 11/07/2014 7:19 PM
Pounder Posts: 504 Joined: April 10, 2012	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	#3 Posted on 11/07/2014 7:38 PM
1/2 Pounder Posts: 205 Joined: October 26, 2014	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	#4 Posted on 11/08/2014 7:32 AM
Newbie Posts: 43 Joined: May 29, 2014	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	#5 Posted on 11/08/2014 11:56 AM
1 1/2 Pounder Posts: 834 Joined: October 23, 2008	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	#6 Posted on 11/10/2014 9:15 AM
Newbie Posts: 43 Joined: May 29, 2014	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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