 Subaru1-3-2-4Premium
join:2001-05-31
Greenwich, CT | Sunon fan question I have one of these fans right here
»www.digikey.com/product-detail/e···/1021221
Something does not seem right, first of all if you see the specs it puts out a lot for it's size but loud.. anyways the red and black wire should be power but nothing happens. Now if I connect the black and yellow wire the rotor moves but wont move unless I manually push it but it's not spinning at 13K rpms.
The yellow wire as you know is rpm, so I assume the fan is trash? my input was 12 V it sucks because I used it very little
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It's NOT Ni-kon It's NE-KON!
LG is NOT Lifes Good It's Lucky Goldstar!
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Subaru1-3-2-4Premium
join:2001-05-31
Greenwich, CT | I hope sunon has good support |
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lutful... of ideasPremium
join:2005-06-16
Ottawa, ON Reviews:
 ·TekSavvy DSL
| reply to Subaru
said by Subaru:The yellow wire as you know is rpm, so I assume the fan is trash? Maybe not. This is what is inside typical 3-wire fans.
You should not connect stuff before reading up about them. Sunon most probably provides spec for maximum PWM duty cycle to drive the fan. |
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Subaru1-3-2-4Premium
join:2001-05-31
Greenwich, CT | The thing is as I said I had this fan for two years and when I connected it before I used the red and yellow for (+) and black for (-) and the fan ran at 13,000 rpms.. I'm lucky enough to get 600 rpms out of it..
It's a ball bearing fan so that might have some kind of effect to it.
last time I used it was 2 years ago with it screwed into a heatsink to cool off a led I was testing, that was the last time I used it between then and now. |
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lutful... of ideasPremium
join:2005-06-16
Ottawa, ON | The starter capacitor probably got damaged but it may be deep inside the metal casing of the motor. |
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Subaru1-3-2-4Premium
join:2001-05-31
Greenwich, CT | Hmm could be, I know it has a locked rotor detector and sometimes it will just sit trying to spin every few seconds, it puts out good air.. I might try and just open it.. at least the prices are lower then when I first got it. |
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 shdesignsPowered By Infinite Improbabilty DrivePremium
join:2000-12-01
Stone Mountain, GA | reply to Subaru
Why would you connect yellow to +? That would probably burn out the motor chip. |
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Subaru1-3-2-4Premium
join:2001-05-31
Greenwich, CT | most likely did |
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 JasonStowage Class TravelerPremium,Mod
join:2001-01-24
38.2967 Lat
kudos:3
 ·AT&T U-Verse
Host:
Wireless Security
| reply to Subaru
As far as fatalities go, a $15 fan is a walk in the park.
Yeah, provided the wires are soldered to the control board on the fan, if +12V applied to the red and black dont make it go, then the Sh*t probably hit it 
Sorry bud.. Time to get a new fan. Sometimes they just go, even with little use.
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When cryptography is outlawed, bayl bhgynjf jvyy unir cevinpl. |
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Subaru1-3-2-4Premium
join:2001-05-31
Greenwich, CT | Yeah I will be getting another maybe tomorrow its nice the fan came with a finger guard |
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lutful... of ideasPremium
join:2005-06-16
Ottawa, ON Reviews:
·TekSavvy DSL
| reply to Subaru
said by Subaru:I had this fan for two years and when I connected it before I used the red and yellow for (+) and black for (-) and the fan ran at 13,000 rpms Just noticed you were applying 12V on yellow wire for 2 whole years! |
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Subaru1-3-2-4Premium
join:2001-05-31
Greenwich, CT | but only used the fan 5 times! |
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Subaru1-3-2-4Premium
join:2001-05-31
Greenwich, CT | reply to Subaru
I got two of these off ebay, wont be making that mistake again 
Delta FFB0412SHN-FOO
»www.ebay.com/itm/370609499727?ss···97.l2649 |
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Subaru1-3-2-4Premium
join:2001-05-31
Greenwich, CT
1 edit | reply to Subaru
I have a question.. my two Delta fans came today but one little thing So my input supply voltage is around 18.6V now and the fans are 12V.
If I wanted to drop them to 12V I would need a 16 ohm resistor? But it seems like it would have to be a pretty decent sized one?
*edit
or use a regulator.. I have a LDO 12v+ regulator which I think might be better off, I don't think I need a heatsink.. a .62A draw should not be much of anything for a TO-220 case right? |
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shdesignsPowered By Infinite Improbabilty DrivePremium
join:2000-12-01
Stone Mountain, GA | .62 * (18.6-12) = 4.09 watts.
That is a lot of heat to have no heat sink. |
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Subaru1-3-2-4Premium
join:2001-05-31
Greenwich, CT | said by shdesigns:.62 * (18.6-12) = 4.09 watts.
That is a lot of heat to have no heat sink.
Yeah I figured..
The model on the chip is: LM2940T
I don't have any spare heatsinks right now..
Any tips on getting a nice round hole in plastic? I was going to make this again but just thinking about it the IRF510 Is a mosfet but I'm pretty sure I can put the LM2940T in front to lower the voltage and the IRF510 after to the fan right? I'd need two heatsinks, no?
»www.rlocman.ru/i/Image/2008/04/28/2.gif
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It's NOT Ni-kon It's NE-KON!
LG is NOT Lifes Good It's Lucky Goldstar!
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| reply to Subaru
Don't use a resistor... 6.6V*0.62A =~4W -> a lot of heat
Consider a switching regulator. |
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Subaru1-3-2-4Premium
join:2001-05-31
Greenwich, CT | said by cowboyro:Don't use a resistor... 6.6V*0.62A =~4W -> a lot of heat
Consider a switching regulator.
Well I was trying to use what I have at the moment in front of me..
Which is a LM2940T & IRF510 between those two I don't see why I can't do that? I can test it out tomorrow since my order from Mouser will be coming in.
The lm2940t will just be used to regulate the input voltage to 12V and the 510 to switch.
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It's NOT Ni-kon It's NE-KON!
LG is NOT Lifes Good It's Lucky Goldstar!
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shdesignsPowered By Infinite Improbabilty DrivePremium
join:2000-12-01
Stone Mountain, GA | Looks like you could use the MOSFET and as that circuit will drop the voltage. |
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Subaru1-3-2-4Premium
join:2001-05-31
Greenwich, CT | Last time I did this looong time ago something crazy must of happened the trim pot I had (radio shack) 15 turn burned up on me pretty badly.. Not sure what happened as it was working fine then a few more turns to set and the magic smoke was out of the NTC thermistor.
Because I know that circuit is really nothing but a variable resistor but I don't want any crazy spikes and not a repeat of what happened last time.
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It's NOT Ni-kon It's NE-KON!
LG is NOT Lifes Good It's Lucky Goldstar!
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