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Building a kiln controller



 
 
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  #11  
Old February 10th 05, 06:47 PM
David Billington
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You want to be carefull using the parallel port, the circuitry has very
little drive capability and should be buffered. If driving a relay uou
should also add a diode to absorb the back EMF or you could damage up
the port. Velleman make a number of kits which may be of use such as a
USB io card VEL-K8055 . Can''t find the Velleman siter but it shown
here http://www.cps-electronics.co.uk/edu-kits.htm at the bottom of the
page.

Boner the Cat wrote:

not so, lots of relays would run off of that voltage. I found a relay that
runs off the voltage in a parallel port!!!

but an intermediate relay is no big deal either

"Mike Firth" wrote in message
...

I question whether this is appropriate - it seems to offer features you
don't need and seems inadequate in what you do need.
The specification .pdf file says
Control Output: 5 Vdc drive @ 50 mA max (internal 5 Vdc source)

This means that you will have to use 5 volt driven relays. The size that
will carry your amperage may pull enough milliamps that if you want to
double up relays to get capacity that you will exceed the 50ma. You may
have to buy a small 5VDC relay from Radio Shack (fortunately the 5 v

supply

is in the controller) just to drive the contactors or bigger relays. The
contactors Omega sells seem to have 120 or 240 volt coils, so an
intermediate relay would be require.

--
Mike Firth
Hot Glass Bits Furnace Working Website
http://users.ticnet.com/mikefirth/hotbit47.htm Latest notes

"liam potts" wqdwqe@kjka wrote in message
news

I am looking to build a controller for my kiln its 240 30 amp
it has 4 240 6kw elements in it. I was thinking of using the Omega

CN1501

Series http://www.omega.com/ppt/pptsc.asp?ref=CN1501. I am a little
confused
on how many relays an output can control I assume its one for one but I

am

not sure. Any advice would be greatly appreciated

Liam Potts






Ads
  #12  
Old February 10th 05, 08:06 PM
nJb
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liam potts wrote:

I am looking to build a controller for my kiln its 240 30 amp
it has 4 240 6kw elements in it. I was thinking of using the Omega CN1501
Series http://www.omega.com/ppt/pptsc.asp?ref=CN1501. I am a little confused
on how many relays an output can control I assume its one for one but I am
not sure. Any advice would be greatly appreciated

Liam Potts


I drive my controllers with a CAL9500P through an SSR. Works great.

Jack
  #13  
Old February 10th 05, 08:10 PM
nJb
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David Billington wrote:

5vdc @ 50ma will drive a relay but may be intended to drive a solid
state relay which it would do easily. One would want to check that the
drive is suitable for driving an inductive load like a relay also, it
needs to be able to take the back EMF when the relay is de-energised or
may be damaged. You could of course add your own diode across the relay
to absorb the back EMF.


You're making this way too complicated. When you order a controller, you
order it with the board to drive the type of relay you want to use. If
you want to use mechanicals, AKA clickers, order a simple relay board
and clickers with 120 or 240 volt coils.

Jack
  #14  
Old February 10th 05, 08:11 PM
nJb
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liam potts wrote:

I am looking to build a controller for my kiln its 240 30 amp
it has 4 240 6kw elements in it. I was thinking of using the Omega CN1501
Series http://www.omega.com/ppt/pptsc.asp?ref=CN1501. I am a little confused
on how many relays an output can control I assume its one for one but I am
not sure. Any advice would be greatly appreciated

Liam Potts


An output can control more than one relay but I'm not sure why you would
want to have more than one.

Jack
  #15  
Old February 10th 05, 08:16 PM
nJb
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liam potts wrote:

Ya I tried contacting them was a route I was considering still have not
gotten an e-mail

And it looks like if I can use the omega it will be cheaper


How much?

Jack
  #16  
Old February 10th 05, 08:21 PM
nJb
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liam potts wrote:

--
...
If you want all elements to operate, "as one", all off or all on, then

what
I have in mine is one relay per element, but all the relays run on one
controller.

Considering each element is 240 6kw so lets see 6000/240=25x4= 100 amps I
do not want to put all the elements on at the same time. Its only a 30 amp
breaker


This is strange liam. Why do you want to try to run a 100A kiln on a 30
amp circuit? Sounds like you're trying to run one element at a time. Not
trying to be a smart ass here, but I'm working on this round thing.
Think I'll call it a wheel. It's gonna be a big hit. Maybe I am trying
to be a smart ass. Seems like you're going about things in a complicated
manner.

Jack
  #17  
Old February 10th 05, 09:19 PM
nJb
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liam

It looks like your controller of choice doesn't come in a K tc model.

Jack
  #18  
Old February 10th 05, 09:28 PM
liam potts
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maybe I am confused but I assumed one relay per element ?



http://coil1002.livejournal.com

"nJb" wrote in message ...
liam potts wrote:

I am looking to build a controller for my kiln its 240 30 amp
it has 4 240 6kw elements in it. I was thinking of using the Omega

CN1501
Series http://www.omega.com/ppt/pptsc.asp?ref=CN1501. I am a little

confused
on how many relays an output can control I assume its one for one but I

am
not sure. Any advice would be greatly appreciated

Liam Potts


An output can control more than one relay but I'm not sure why you would
want to have more than one.

Jack



  #19  
Old February 10th 05, 09:36 PM
liam potts
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This is strange liam. Why do you want to try to run a 100A kiln on a 30
amp circuit? Sounds like you're trying to run one element at a time. Not
trying to be a smart ass here, but I'm working on this round thing.
Think I'll call it a wheel. It's gonna be a big hit. Maybe I am trying
to be a smart ass. Seems like you're going about things in a complicated
manner.

Jack



Here is the deal I have a cress c-20-l its 240 30 amp kiln with four
elements and three manual controls one control is hooked up to two elements
the middle ones. Excuse my ignorance but I figured if each element is 240vac
25 amps I would want to avoid having all the elements on at the same time.
So once again I assumed I would need a relay per element to avoid having all
the elements on at the same time. I do agree I may be way over complicating
things if I am please suggest a better route.




  #20  
Old February 10th 05, 09:38 PM
liam potts
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"nJb" wrote in message ...
liam potts wrote:

Ya I tried contacting them was a route I was considering still have not
gotten an e-mail

And it looks like if I can use the omega it will be cheaper


How much?

Jack


Looking like $200 at this point but hell by the time I get done with it and
all the frustration it might not be worth it. I am still not able to get
them to reply to an e-mail


 




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