Carwiz, got a minute?

[JTW37]

Okay, I'll change the setting you listed. Thought I was going to have to go look up the Old German guy that helped me the first time. But you came to the rescue. Thanks. Will let you know the outcome.

[crowntech]

Hey Carwiz,

I too could use some help with the TET612. I'm going to use them to control the temp. in mixing tanks. There heated with steam coils. All the controller needs to do is energize a solenoid valve. I'm using teminals #13 & 14 and have the outy=1

I always bench test units before I install them, I've got 3 TEF612 set up but can't get any of them to work. I can not get an out (contact closure) on J2.

Here's my parameter settings in 0089
Inty=J
Outy=1
Atdu=0
PSd=0
Rd=0
CorF=1

I've not changed any of the parameters in 0036

parameter settings in 0001, I set all the AH and AL to the same value to disable them, no use to me.
SV=90
AH1=40
AL1=40
AH2=40
AL2=40

Any thoughts as to way I'm not getting an output on J2?

[CarWiz]

Geez, this thread should be renamed PID Control or similar. But, I glad you asked Ct.

I now see that part of JT's problem may be the type of Thermocouple selected as well as yours Ct. The "J" or backward L is not the same as a "K" type TC. The J and K have different millivolt responses to temperature. I checked the display on one of mine and while it's not a "K", it shows a partial k with a vertical bar and diagonal to the right. Both of you should verify the type of thermocouple and change Inty to the correct setting.


Ct - J2 is nothing but a single pole switch. There won't be any "output" unless you feed one side (#13) with power. When J2 is energized, #14 will pass the voltage applied on #13. The other side of your solenoid should have a connection to Common. Be sure your solenoid valve doesn't draw more than 3A!

While you may not have changed any parameters at address 0036, I still need to see what's there. I also need to know how and where you mounted the TC. Is it in full contact with the mixing tank solution or in a tube? Some details here would help. I see by SV that you're trying for 90°F control. Are you using Auto Mode?

I'll be back on later this evening.
Ken

[crowntech]

I'm out of here for the weekend.

I'm using a "J" probe with my system. What did you mean by using Auto Mode?

Be back Monday....

[CarWiz]

CT, make sure your wiring looks something like this. This is a simple 120v AC circuit to control a normally closed solenoid valve.

[JTW37]

Boy am I glad you spotted that Carwiz. My oven has been driving me nuts with the extreme temps. The oven and Controller are about 100 to 125* from each other. The PID hasn't controlled it properly, as the temp range for heat up to 400, goes beyond that after it shuts down at 399*. Then it drops down to 374 before it shows any sign of climbing back up to 400.

My thermocouple is a K type that came with the PID. I also have an Industrial one, that is like the one in my bigger oven. It is a J type. The PID in that oven is a Barber-Coleman. But I couldn't get it (PID) to even recognize the J type. (?)

I will check the settings for the K type in the Morning as well as here to see if you posted and make sure I'm on the right track. Next thing I will have to do is see if I can find a replacement glass for the one that cracked.
Thanks again, JT

[crowntech]

That drawing is how I've got mine wired. After I posted my cry for help, I went back down to the shop and changed all of the 0036 settings to what you'd posted earlier just to see if I could get a reaction.

J2 is closing now but only for a second and very eratic. I tried putting it in auto tune mode but it just sat there flashing, I left it for over 20 minutes but it never came out of AT mode.

I don't have anything hooked up to J2 right now but I know that the soleniods draw less than 1amp.

I'll double check to probe setting monday and post the 0036 settings.

Could the fact that I've got all of the AH and AL set the same be causing an issue?

Thanks;

Have a Great Weekend

[JTW37]

Oven did great today!! I burned up my contactor I was running it through a cycle and seen sparks in the cabinet. I shut it down and opened the door and felt wires to see which one got hot and it had burned it off. When I got the screw driver to unscrew that wire lug in the contactor, it came a part.

Will have to start from scratch. Changed the setting for the K instead of the J thermocouple. It still wasn't preforming right, then the sparks. ?

My brain is tired.

[CarWiz]

Originally Posted by crowntech

J2 is closing now but only for a second and very eratic. I tried putting it in auto tune mode but it just sat there flashing, I left it for over 20 minutes but it never came out of AT mode.

The PID learns temperature changes over a period of time and will adjust the on-time for J2 based on the parameters. If you don't have the TC monitoring a change in temperature, the PID is monitoring ambient and trying to determine how long to leave J2 on. I would imagine that it got pretty confused when it couldn't raise the temperature. Thus the erratic behaviour.

I don't have anything hooked up to J2 right now but I know that the soleniods draw less than 1amp.[/quote]
I'm assuming that, in operation, J2 controls your valve that allows steam to heat some fluid monitored by the thermocouple. If you don't have anything to heat the thermocouple, how did you enter Auto Mode? The temperature that you want to maintain should be reached before entering Auto Mode.

Could the fact that I've got all of the AH and AL set the same be causing an issue?

I have not used the relays to control heaters (solenoids) but my guess is no. The AH1 and AL1 are just high/low settings for J1 that you aren't using. When AH=AL, the relay is disabled so that one wouldn't matter. The instructions indicate J2 is controlled by the PID when Outy=1 and AH2 & AL2 are ignored. If this is the case, the values there don't matter.

[JTW37]

Well, after having a look at my contactor, I definitely need a new one. Have a picture attached. The only thing I can think of is it got to hot. Don't know why, but it did. Any idea's?
Thanks, JT