Setpoint Profiles (for Reflow et al)

[dchris01]

3,110,0   //Step (3) setpoint to (110) and Immediately go to next step
1,175,30  //Ramp (1) setpoint to (175) over the next 30 seconds
3,175,10  //Step (3) setpoint to (175) and wait 10 seconds
1,200,30  //Ramp (1) setpoint to (200) over the next 30 seconds
3,200,30  //Step (3) setpoint to (200) and wait 30 seconds
1,230,30  //Ramp (1) setpoint to (230) over the next 30 seconds
3,230,30  //Step (3) setpoint to (230) and wait 30 seconds
3,75,30   //Step (3) setpoint to (75) and wait 30 seconds
I have this profile set up and these were the results
 
 
Time                          Ospid temp         TC temp
30 seconds                 127                         141
1 min                          164                        172
1.30 min                     199                        200
2 min                          225                        219
2.30 min                     237                        228
3 min                          219                        214
3.30 min                     201                        196
4 min                          183                        186
4.30                             171                        168
 
 When preheater got motherboard to temp 110 I ran this profile
I got this reading with TC  around 3mm from chip i was practising on
One thing I am having issues with is when I select a profile from list in osPID front end and select my com port and then connect I then click send profile but nothing happens. The only way I can get the profile to send and run is to disconnect and connect straight away this then runs 100% without fail. Maybe error in software.

[Maddox]

One thing I am having issues with is when I select a profile from list in osPID front end and select my com port and then connect I then click send profile but nothing happens. The only way I can get the profile to send and run is to disconnect and connect straight away this then runs 100% without fail. Maybe error in software.

I have seen the same behavior.

[Brett]

I have seen the same behavior.

ok. confirmation warrants an issue on github. I'll look into it.

[Petterson]

http://img826.imageshack.us/i/imagexil.jpg/
http://www.flickr.com/photos/danstrother/5354723924/
I have two pictures one for leaded solder reflow and other lead free
I want to start both from 100oC but coding wouldn't be one of my strong points any help is appreciated

[Maddox]

I have two pictures one for leaded solder reflow and other lead free

What are your PID tuning parameters for the run?

[Brett]

I've updated the Setpoint Profile Code for both the firmware and the front-end. 2 things:
-bundled with the front-end I've included some useful (*gasp*) profiles: Leaded and RoHS. included out of the box
-the osPID buzzer can now be triggered at any point in the profile. in the default profiles this happens at the end, but you should put the command anywhere.

as always, the code can be found http://github.com/ospid

[dstorey]

Wanted to add to this thread ... not sure if I am doing anything wrong, but I wanted to create a very simple profile for curing special paint for sublimation printing onto metal plate. It's a simple process - cure in the oven for 20 minutes at 160 deg. C.

So I used this:

Curing // first row is Profile Name
3, 160, 0 // Step Setpoint to 160, wait 0 seconds
2, 0, 0 // Wait for PID Input to cross setpoint
127, 0, 5 // buzz for 5 seconds
3, 160, 1200 // Step setpoint to 160 and wait 20 minutes
3,30,0 // Step setpoing back to 30 and cool down
127, 0, 5 //buzz for 5 seconds
2, 0, 0 //Wait for PID Input to cross setpoint

So I uploaded the profile to the unit and put the plates into the oven for curing.
It believe it worked fine for the 20 minutes (I was out of the room at the time) but after the allotted time instead of staying at low temperature, the oven just turned on and stayed on a full power (to 250 deg. C), which was a bit of a disaster for my plate.

Is this normal behaviour? Is my file missing something? Is there any command that can be placed into this file that stops the pid and switches everything off? That's what I need!

What would really really help is some good documentation. I read in other places that you are looking for the right wiki. Why not just put the docs into a pdf and post it on your web site? Keep it simple!

thanks Dominic

[dstorey]

Ah I think I have found the answer to my own question.

I hadn't realized I could select the profile at the bottom of the main menu list. I found that info buried in this thread (it would REALLY help to have a manual!)

My I suggest that on the next release, you move these menus around a bit? I'd suggest placing the menus used most near the top so they are accessed quickly.

Also, is there any room for multiple profiles in EEPROM?

Now that leaves one other thing. I must have been running in manual mode as it had been maintaining the temperature for a while. It just stopped doing so and left the relays on all the time with the temperature soaring from 160 to 250 C. It was quite happy doing so.

Could you add a safety protocol, such that if the controller has lost loop control (say temperature reaches a upper set point or doesn't change direction after X seconds) then the relays shut off and sound an alarm?

Dom

Dominic