Happy HolidaySs Giveaway - Last Sponsor Giveaway of the Year!

Come Enter the BrewDeals/FastFerment Giveaway!


Home Brew Forums > Home Brewing Beer > DIY Projects > Chillers and Stir Plates > DIY Stir plate question
Reply
 
LinkBack Thread Tools
Old 06-04-2009, 04:34 AM   #1
gchunter
Feedback Score: 0 reviews
Recipes 
 
Join Date: Apr 2009
Posts: 8
Liked 1 Times on 1 Posts

Default DIY Stir plate question

I started to make a stir plate following from a search on this forum (<http://www.homebrewtalk.com/f51/my-s...y-build-86252/). It looks like my fan might be bad out of an old computer I had. It was in the basement for about 3 months and the fan had been working. The fan I used had 3 wires red, black, and white. I tried hooking it up as shown for the 2 wire fan instructions and that didn't work. I also tried hooking it directly to the power source and then tried all of the possible combinations directly to the power source. Is there something I am missing or do I just have a bad fan? I have another old computer that I can get my hands on as well and get the magnet and fan out of but would appreciate any help.

The power source does work as it lights up the led light on the power switch to the stir plate.

__________________
gchunter is offline
 
Reply With Quote Quick reply to this message
Old 06-04-2009, 05:43 AM   #2
BrewBeemer
HBT_SUPPORTER.png
Feedback Score: 0 reviews
Recipes 
 
Join Date: Feb 2006
Location: island, in an atoll
Posts: 3,510
Liked 21 Times on 21 Posts
Likes Given: 7

Default

You sure that you have voltage at the output of your power supply?
Lights on does not mean you have power out. The Red Black should be the fan leads. If hooked up backwards the fan will not run at all, reverse the polarity it should then run. Check with a volt meter the leads from your power supply as it is rare for a computer fan to take a dump.
The larger low rpm fan motors like 4" that draw higher currents of the 500 to 700 mA range will provide more torque running under a reduced voltage for your slower stir speeds. This is what you want.

__________________

Bier Jagdwaffe... Bier 30 zeit.....~~=o&o>..........

BrewBeemer is offline
 
Reply With Quote Quick reply to this message
Old 06-04-2009, 01:53 PM   #3
gchunter
Feedback Score: 0 reviews
Recipes 
 
Join Date: Apr 2009
Posts: 8
Liked 1 Times on 1 Posts

Default

I am using a 12 volt cell phone charger that worked prior to cutting the cell phone charging end off. It is a 12 volt fan from the computer so it should be the same voltage. I had tried all combinations of connections for wiring and nothing worked to get the fan moving. I'll try testing the power cord.

The computer fan does not run constantly in a computer and only turns on when needed. Could there be a switch or delay that I have to overcome to get this fan to work?

__________________
gchunter is offline
 
Reply With Quote Quick reply to this message
Old 06-04-2009, 04:45 PM   #4
Hang Glider
Beer Drinker
HBT_SUPPORTER.png
Feedback Score: 1 reviews
 
Hang Glider's Avatar
Recipes 
 
Join Date: Mar 2007
Location: North Augusta, SC
Posts: 3,157
Liked 147 Times on 118 Posts
Likes Given: 102

Default

gchunter - any delay for the fan to work is thermostatically controlled elsewhere. If the fan is removed from the system, a simple red to red, black to black should work fine (assuming DC power, DC fan). if you've attached your magnet to the fan - try taking it off until the problem is solved. My magnet was too strong and interferring with the motor. I ended up separating the magnet from the motor by half an inch with spacers.

__________________
Hang Glider is offline
 
Reply With Quote Quick reply to this message
Old 06-04-2009, 09:29 PM   #5
BrewBeemer
HBT_SUPPORTER.png
Feedback Score: 0 reviews
Recipes 
 
Join Date: Feb 2006
Location: island, in an atoll
Posts: 3,510
Liked 21 Times on 21 Posts
Likes Given: 7

Default

The Power Tower I took apart made by Sun had six 12 volt 720 mA 4" fans on it with a red, black plus two whites to a thermal probe a little 1/4 drop of epoxy looking thing on the fan in the airstream. Not only this if at above 5.5 volts and stall the fan after 4 seconds the thermal unit in the fan would kick off the power. A overload protection I believe. I was told these were pig motors with the amount of current they draw but this allows for more torque also especially when the voltage is lowered for speed control as in a stir.
I ordered a LM317 adjustable voltage powwer supply that can handle 1.5 amps thru ECROS Technology for $9.95 with a couple bucks shipping. It is a kit needing to be soldered together. That and a Radio Shack project box then im good to go. For a few minutes at the curbside I had six free fan motors.

__________________

Bier Jagdwaffe... Bier 30 zeit.....~~=o&o>..........

BrewBeemer is offline
 
Reply With Quote Quick reply to this message
Old 06-05-2009, 04:25 AM   #6
gchunter
Feedback Score: 0 reviews
Recipes 
 
Join Date: Apr 2009
Posts: 8
Liked 1 Times on 1 Posts

Default

I have access to another fan and will try that one first. If that doesn't ork I think I will look into trouble shooting it further. I am just think it might be a quick easy fix but chances are I am wrong.

__________________
gchunter is offline
 
Reply With Quote Quick reply to this message
Reply



Quick Reply
Message:
Options
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Another stir plate Question blaze379 DIY Projects 7 06-20-2012 08:26 PM
Stir Plate Question Stevorino Equipment/Sanitation 2 04-15-2009 06:35 PM
Stir Plate Question jtucker101 Chillers and Stir Plates 7 03-28-2009 04:11 PM
A different stir plate question rcrabb22 Equipment/Sanitation 1 02-20-2009 10:18 PM
Stir plate question redtail28 Chillers and Stir Plates 5 12-29-2007 05:14 AM



Newest Threads

LATEST SPONSOR DEALS