Jump to content


Photo
- - - - -

PID Controller Programming. Cone 05 Bisque and Cone 5-6 Glaze Firing Schedules


  • Please log in to reply
5 replies to this topic

#1 MichaelP

MichaelP

    Advanced Member

  • Members
  • PipPipPip
  • 181 posts
  • LocationIL/WI border

Posted 03 June 2013 - 09:38 PM

I'd like to post my notes on programming a simple Ramp and Soak PID temperature controller for Bisque (Cone 05) and Glaze (Cone 5-6) Firing. The Glaze Firing Schedule was adopted from the book "Mastering Cone 6 Glazes" by John Hesselberth and Ron Roy. The Bisque Firing Schedule is based on suggestions found in many books and other sources of information.

Note that the controller is programmed in Celsius. The controller operates an SSR (Solid State Relay) which switches the kiln on and off (Note: if you use a mechanical or mercury relay, use Cycle Time value from 20 to 40 instead of "5" in the PID setup).

My controller is capable of programming 50 steps. I allocated steps 1 through 7 for Bisque Firing program and steps 15 through 21 for Glaze firing.

I hope someone may find these notes helpful for setting and programming his/her own PID controller.It'll be quite easy to substitute the temperature and time values if you want to change the curves.

Attached Files



#2 MichaelP

MichaelP

    Advanced Member

  • Members
  • PipPipPip
  • 181 posts
  • LocationIL/WI border

Posted 02 September 2013 - 01:36 AM

Here is something else that can be helpful to program Cone 5-6 in digitally controlled kilns. This is a way to emulate Cone Firing while making a custom program in Ramp and Hold Mode of Skutt and other controllers, including PIDs.

 

Choose the rate of the temperature increase during the last 200F of firing and see what temperature your kiln should reach to achieve Cone 5, 5 1/2 or 6. Each graph corresponds to one of the Cone #.

 

This is based on the data provided by Orton for self-supporting cones.

Attached Files



#3 Wyndham

Wyndham

    Advanced Member

  • Members
  • PipPipPip
  • 412 posts
  • LocationSeagrove NC

Posted 02 September 2013 - 10:10 AM

I'm interested in what type of controller you have. Is it a commercial or  a home brew? How many zones can you control and do you use or can you use type S thermocouples?

 

I have an older Bartlett for my kiln that has type s and 3 zones, which I find very helpful but have wondered about how to write a program for a homebrew controller.

 

Looking forward to digging into this with you, Wyndham



#4 MichaelP

MichaelP

    Advanced Member

  • Members
  • PipPipPip
  • 181 posts
  • LocationIL/WI border

Posted 02 September 2013 - 11:47 AM

Wyndham,

 

A few months ago I made a stand alone single zone kiln controller based on a PID. It can be used with any kiln that doesn't have a controller. One will only need to install a thermocouple and do simple rewiring to bypass any controls the kiln may have. The PID I used accepted K type couples.

 

Since then I bought Scott with a built-in controller, so my second post can be applied to the Ramp/Hold mode of its KilnMaster as well as any other controller.



#5 Wyndham

Wyndham

    Advanced Member

  • Members
  • PipPipPip
  • 412 posts
  • LocationSeagrove NC

Posted 02 September 2013 - 11:57 AM

After reading your post , I googled PID and it seems that most are a single zone as your first one was. The Bartlett I have is only about $200 new and has all the ramp/holds and set for type S

I have one of these on one kiln but was thinking how others might be working.

Cost wise Bartlett is more convenient I think.

Thanks Wyndham



#6 MichaelP

MichaelP

    Advanced Member

  • Members
  • PipPipPip
  • 181 posts
  • LocationIL/WI border

Posted 02 September 2013 - 10:26 PM

Wyndham,

 

Indeed, it's a very nice and reasonably priced controller for those who need multi-zone control and use S-type thermocouples. I was a bit surprised it didn't have outputs for SSRs (solid state relays) though.

 

However, for an average Joe who has a single zone kiln with a K-type couple this controller is an overkill, IMO. Considering the extras he will need to add to make a complete device, it might be wiser just to buy one of the stand alone (a.k.a. "wall mount") controllers. In either case he will get a very convenient device with a nice interface, but the interface adds $200-$300 if compared with a generic PID-based kiln controller.






0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users