Spike Brewing 12.5 Conical Fermenter Giveaway - Enter Now!

Home Brew Forums > Home Brewing Beer > Electric Brewing > PWM Problem

Reply
 
LinkBack Thread Tools
Old 02-19-2012, 09:01 PM   #1
Iowabeerguy
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jan 2009
Location: Johnston, Ia
Posts: 57
Default PWM Problem

I've checked all of the threads that I can find, but can't find my solution. Time to ask for help from the group.

I bought a Bakatronics FK804 pre built to control my BK, switched out C1 to a 2.2uF cap, hooked up to my SSR to verify that all is well before buttoning it up, and the SSR light is on solid. Tried all of the basics, cap polarity, even tried switching out to a 4.7uF, thought maybe my cap was bad, but no luck.

Using a 12v wall wart, getting 12v out, just no duty cycle - steady output. One interesting point that may help diagnosing this problem is that the transistor on the board gets really hot, really quick - tells me somethings wrong but I can't find it.

Any thoughts?

__________________
Iowabeerguy is offline
 
Reply With Quote Quick reply to this message
Old 02-19-2012, 10:36 PM   #2
JRems
Feedback Score: 0 reviews
Recipes 
 
Join Date: Nov 2010
Location: Mahopac, NY
Posts: 2,229
Liked 58 Times on 50 Posts
Likes Given: 9

Default

Have you checked the ssr for proper operation? It could be a bad ssr as well.

__________________
JRems is offline
 
Reply With Quote Quick reply to this message
Old 02-19-2012, 11:28 PM   #3
Iowabeerguy
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jan 2009
Location: Johnston, Ia
Posts: 57
Default

Yes I have - SSR is fine. I've manually checked it, and I've checked the output of the PWM with a multimeter, with no success. The only thing I can think of is a bad component - this thing is pretty much a no-brainer, especially when you get it pre assembled.

I picked up a new 555, I'm going to plug it in to see if that fixes the problem.

__________________
Iowabeerguy is offline
 
Reply With Quote Quick reply to this message
Old 02-20-2012, 03:18 PM   #4
audger
Feedback Score: 0 reviews
Recipes 
 
Join Date: Apr 2011
Location: ., Connecticut
Posts: 1,497
Liked 40 Times on 40 Posts
Likes Given: 1

Default

Quote:
transistor on the board gets really hot, really quick - tells me somethings wrong but I can't find it.
that just tells you that its constant on, which you know. the more % of the time its on, the hotter it will get. 100% = hot.

if you can find a schematic for that board, i could tell you more. i wasnt able to quickly find one though.
__________________
audger is offline
 
Reply With Quote Quick reply to this message
Old 02-20-2012, 08:28 PM   #5
Iowabeerguy
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jan 2009
Location: Johnston, Ia
Posts: 57
Default

Thanks for the assistance, but since the board has pretty well been destroyed by my diagnostic process, I will be ordering a new one from Bakatronics. Never did figure out what the problem was, but I will for sure be testing the new one prior to changing out the cap.

__________________
Iowabeerguy 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
Problem with Thermocouple bizybrewer Electric Brewing 7 02-17-2012 06:22 PM
Pid syl-2352 problem bloke Electric Brewing 13 01-24-2012 07:17 AM
Any problem with the length of this run HossTheGreat Electric Brewing 4 02-01-2011 03:04 PM
Heatstick problem... FenderSteve Electric Brewing 7 01-23-2011 02:44 PM
Heastick problem brewdogskip Electric Brewing 4 12-13-2010 06:08 PM