PID set up and running.

[Deeda]

I have everything is good...

Now here is where the dumb in me comes out. I have the TET612 manual and really, it could be in greek. I just can't figure out what to do to start.

I plugged in the oven and it clicks on the contactor and the elements heat up. The lower display says 200...the upper says 15 then starts counting down.


Can anyone just lay out what I am supposed to do now? I can't figure out any of it. Today I let it run till the upper display read -004 then figured that I should probably defer to someone that know how to deal with this.

I would really appreciate someone just giving me a step by step of what to do to get to actually using this oven.


Please help me.

[ed_denu]

I think there is something wrong with the set-up/wiring. The upper display is the present value or current temperature reading. The lower is the set value. Check the polarity of the thermocouple wire leads ataching to the pid. They should be attached to terminals 9 & 10, with 9 being the + side.

Also you need to check that you have the correct thermocouple defined in the pid. The default tc for the tet612 is PT10, but the more common tc's used are the K type, so the INTY parameter needs to be changed to 'K'. Look at section 4 Parameter Setting for instructions on how to change the INTY parameter.

You also need to make sure OUTY is set to the correct ssr or contactor usage and that RD is set to heating and CORF is set to fahrenheit.

[Deeda]

OK...Changed the thermocouple leads around...that is good.

Changed to a K type.

Everything is dandy.

Except that when I change the CORF to fahrenheit, nothing works. It reads the inside temp. But it won't turn output.

Any idea's?

[Deeda]

ok...

Here is what I need...

I am running a contactor set up.

What I need to know is if I was plugging this in for the first time...what do I do.

I changed the inty settings to K

What now?

I tried changing the outy setting to 1 and in Fahrenheit it started to warm up. I set the target temp to 130 just to see what it would do. It got to 130 degree's and then the relay started to cycle over and over.

Now I can't even get it to start up again.

I really need this oven to work right now.

Any help would be super.

[ed_denu]

Are your settings as follows:

Inty = K
Outy = 1
Rd = 0
Corf = 1

Ot = 5

If so then I would first run the autotuning function.Look at the manual section '5 Auto Tuning'. Perform this section. Then set the 'sv' to your desired temperature. Report back the results.

The oven should heat up until the set value is approached. Then the contactor should start cycling on/off. If the elements fail to heat when there is a large setting difference between the pv and sv then something must have failed. Check for blown fuses, breakers, etc. What schematic did you use?

[Deeda]

Just a question...

During this AT session. What if anything should be happening?

How long does the AT take?

Do I need to set anything like a target temp before doing the at?

[ed_denu]

During the at session, the pid will react much the same as a normal heat cycle. The only difference is that during AT the pid will allow the oven to exceed the set temperature somewhat, cool down and repeat the cycle. AT depends somewhat on the oven configuration, but a normal cycle should be under 20 minutes.

Set the target temperature a little under normal cure temps. I would use something around 350.

[Deeda]

Going to give it a shot here in a couple hours...fingers crossed...I have a mountain of stuff waiting to enter this oven..

[randy_forbes]

The AT function will be more effective if you have the oven "loaded" much the same as you will when you're running your parts.

In other words, a similar mass/weight.

There is little to be gained by tuning an empty oven, as that's not how it will react when loaded.

For this function, any scrap laying around the shop will do.