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#21
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http://coil1002.livejournal.com "nJb" wrote in message ... liam It looks like your controller of choice doesn't come in a K tc model. Jack I see that now the selection page before that states it does. |
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#22
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liam potts wrote:
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 Generally, a single relay is used to turn on all of the elements at once. Jack |
#23
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"liam potts" wqdwqe@kjka wrote in message ... 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. if you have a 30 amp kiln, then the sum of the element usages is 30 amps, not 30 amps each. |
#24
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liam potts wrote:
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. Now we're getting somewhere. I doubt each element is 25 amps. Most likely, the whole kiln with all switches on high draws 25 amps. Does it plug into a 30 amp circuit? If so that is the 25 is probably the max it will draw. Are you running single phase power? If so your kiln (not each element)is listed at 22 amps. So, let's say it does plug into a 30 amp outlet. Then you will build a control box that your kiln plugs into. All kiln switches will remain on high, the controller will do the rest. Here's how I have done it: Purchase a CAL9500P controller with SSR output List $225 a 40 amp SSR with heat sink, maybe $50 a metal box, $15 a plug to plug the box into the wall $15 an outlet to plug the kiln into $8 a simple on/off switch and fuse $5 Wire it all together and plug it in. My first kiln has a kiln sitter so I use an 1800F cone to protect against runaway. My second kiln has 2 controllers in the box. One just monitors for high temp runaway. Jack |
#25
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On Thu, 10 Feb 2005 12:11:20 -0700, nJb wrote:
An output can control more than one relay but I'm not sure why you would want to have more than one. If you're controlling a US 220-volt circuit, you really should have a relay in each hot leg. -- #local R=7084844682857967,0787982,826975826580;#macro L(P)concat(#while(P)chr( mod(P,100)),#local P=P/100;#end"")#end background{rgb 1}text{ttf L(R.x)L(R.y)0,0 translate-.8,0,-1}text{ttf L(R.x)L(R.z)0,0translate-1.6,-.75,-1}sphere{z/9e3 4/26/2001finish{reflection My opinions, nobody else's |
#26
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liam potts wrote:
http://coil1002.livejournal.com "nJb" wrote in message ... liam It looks like your controller of choice doesn't come in a K tc model. Jack I see that now the selection page before that states it does. OK, I tried the price thing with K and it didn't work. I have 17 programs in my CAL9500P right now and have only used 51% of the memory. Jack |
#27
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liam potts wrote:
"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 You will be at least $350 into a controller if you build it but it's worth every penny. Jack |
#28
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Ron Parker wrote:
On Thu, 10 Feb 2005 12:11:20 -0700, nJb wrote: An output can control more than one relay but I'm not sure why you would want to have more than one. If you're controlling a US 220-volt circuit, you really should have a relay in each hot leg. Why? Jack |
#29
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On Thu, 10 Feb 2005 14:22:30 -0700, nJb wrote:
Ron Parker wrote: On Thu, 10 Feb 2005 12:11:20 -0700, nJb wrote: An output can control more than one relay but I'm not sure why you would want to have more than one. If you're controlling a US 220-volt circuit, you really should have a relay in each hot leg. Why? So that when the power is off, the power actually is off. Say, for the sake of argument, that you have a microswitch attached to the lid, in series with the controller output, to turn off the power when you open the kiln. Say you're raking with a long metal tool. Now say you only turned off one of the legs of the circuit. Guess what, that element still has a potential of 110 volts relative to neutral (which in most places is tied to earth) and is capable of putting up to 30 amps through the shortest path between the tool in your hand and your foot on the ground (or, if you have a wood floor, your hand on the shell of the kiln, which is quite possibly also tied to neutral.) -- plane{-z,-3normal{crackle scale.2#local a=5;#while(a)warp{repeat x flip x}rotate z*60#local a=a-1;#end translate-9*x}pigment{rgb 1}}light_source{-9red 1rotate 60 *z}light_source{-9rgb y rotate-z*60}light_source{9-z*18rgb z}text{ttf"arial.ttf" "RP".01,0translate-.6,.4,.02pigment{bozo}}light_source{-z*3rgb-.2}//Ron Parker |
#30
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Ron Parker wrote:
On Thu, 10 Feb 2005 14:22:30 -0700, nJb wrote: Ron Parker wrote: On Thu, 10 Feb 2005 12:11:20 -0700, nJb wrote: An output can control more than one relay but I'm not sure why you would want to have more than one. If you're controlling a US 220-volt circuit, you really should have a relay in each hot leg. Why? So that when the power is off, the power actually is off. Say, for the sake of argument, that you have a microswitch attached to the lid, in series with the controller output, to turn off the power when you open the kiln. Say you're raking with a long metal tool. Now say you only turned off one of the legs of the circuit. Guess what, that element still has a potential of 110 volts relative to neutral (which in most places is tied to earth) and is capable of putting up to 30 amps through the shortest path between the tool in your hand and your foot on the ground (or, if you have a wood floor, your hand on the shell of the kiln, which is quite possibly also tied to neutral.) I solve that problem by using a 2 pole definite purpose contactor with all safety and overtemp devices wired in the coil circuit. It cuts both legs before the control relay. On my small kiln I turn the manual switches off before reaching in. Jack |
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