If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#11
|
|||
|
|||
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
|
|||
|
|||
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
|
|||
|
|||
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
|
|||
|
|||
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
|
|||
|
|||
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
|
|||
|
|||
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
|
|||
|
|||
liam
It looks like your controller of choice doesn't come in a K tc model. Jack |
#18
|
|||
|
|||
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
|
|||
|
|||
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
|
|||
|
|||
"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 |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
electric kiln firing questions | Zander | Pottery | 5 | October 11th 04 02:31 AM |
Important - Please beware of a company called Bohle | Eric Russell | Glass | 2 | August 23rd 04 07:46 PM |
FAQ Raku part 2 of 2 | SBRANFPOTS | Pottery | 0 | October 21st 03 02:13 PM |
FAQ Raku part 2 of 2 | SBRANFPOTS | Pottery | 0 | September 16th 03 11:11 PM |
Raku FAQs | Tom Buck | Pottery | 0 | July 20th 03 04:49 AM |