Really universal soldering controller

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Re: Really universal soldering controller

Postby vulkan35 » Wed Sep 26, 2018 1:52 am

Hi, help determine where the problem is checkpoint 45.

Image

1.Replaced U8, did not help.
2. I checked all the wires between SDA, SCL U5, U8, U10, U11, U15.
3. Program the controller several times.

From my personal experience, the easiest part to fry while soldering it is the offset DAC (U11), then the gain pot (U15), then the current source pots(U10), and finally the EEPROM(U8). The DAC is the smallest one, with many small terminals, and in very small package.


probably my case, i will order again u11, u15.
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Re: Really universal soldering controller

Postby rpaessle » Wed Sep 26, 2018 5:08 pm

Hello Everyone,

I realize I am late to the game - anyway, I want to document my build experience and maybe someone could comment.
After completion and correction of solder bridges, I had a mainly functional system, but it was exhibiting the same behavior as described by Scoty808: C245 cartridge heating to red-hot and temperature displaying 20 degrees. I replaced U15, but this had no effect. I decided to troubleshoot using a dummy load (2 12V. 10W car lights in series) and this is when I discovered the issue. To connect the dummy load, I disconnected the RED (pin2) wire and placed the load between the BLUE (pin5) and VOUT1-/SENSEA. I used another soldering iron to heat the C245 tip. To my surprise, it worked perfectly (though I'm not sure about the accuracy yet). I then reconnected the cartridge with the blue and red reversed - BLUE to VOUT1-/SENSEA and RED to VOUT1+ . This seems to work without issue. It is also clear that the thermocouple is being read through the heater element instead of directly through the RED wire. I know this from the resistance measured between the cartridge connections:
GREEN to RED: .5 ohms
GREEN to BLUE: 2.8 ohms
RED to BLUE: 3.0 ohms
Does anyone have a clue why it works the opposite way?
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Re: Really universal soldering controller

Postby afedorov » Thu Sep 27, 2018 9:58 am

I suppose it was some initial connection issue, because with a dummy load you've connected TC in pretty much the same way.
Attachments
t245.png
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Re: Really universal soldering controller

Postby rpaessle » Thu Sep 27, 2018 2:55 pm

Thank you for your quick reply. I agree with you, but I still don't understand what is going on. I reconnected the dummy load as follows and temperature measurement stops working.
t245b.png


The only difference is that TC+ now connects directly to SENSEA, instead of passing through the resistive element(s). Is this an issue with the offset of the Diff. amp? By the way, calibration works. Also, I see -.007 V. at the VTemp output when it is working. Is this correct?
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Re: Really universal soldering controller

Postby rpaessle » Thu Sep 27, 2018 5:51 pm

Doh....it appears apologies are in order. The circuit is actually working as designed. A wiring error at the connector reversed the TC polarity and caused the problem. I have no idea why I didn't spot it earlier. Thanks again, afedorov for responding. This has been a very interesting build and I am looking forward to replacing my 30 year old Weller station.
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Re: Really universal soldering controller

Postby Railjumper » Tue Oct 09, 2018 1:34 pm

Hello Guys & Unisolder users,
has anybody connect desoldering Iron or gun to unisolder station? I have ZD-553B desoldering gun that i want to use with the unisolder. Does anyone have an idea how this is connected? Or other desoldering solution? I would be happy about any suggestions.
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Re: Really universal soldering controller

Postby pkircher » Wed Oct 10, 2018 2:23 pm

heya longtime lurker here

are there more informations how to actualy trace the curves to add other irons ?
could not find anything in the previous posts -> i want to add the jbc nano series ..

im talking specificaly about the

- polynomial floating point voltage/resistance to temperature calculation

anything else is pretty much straight forward

thanks
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Re: Really universal soldering controller

Postby pkircher » Wed Oct 10, 2018 2:29 pm

Railjumper wrote:Hello Guys & Unisolder users,
has anybody connect desoldering Iron or gun to unisolder station? I have ZD-553B desoldering gun that i want to use with the unisolder. Does anyone have an idea how this is connected? Or other desoldering solution? I would be happy about any suggestions.


as for the ZD-553B
the unisolder5.2 could drive the iron yet not the vaccum pump required for desoldering

you would need to change the firmware so your iron is supported .. but that means you gotta do some reverse engeeniering and benchmark the curves -

the question is do you really need that much controll for tht components ? i doubt it - rarly any of them are THAT temp sensetive .. and for smt desoldering hotair is mostlikely the better choice
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Re: Really universal soldering controller

Postby Railjumper » Thu Oct 11, 2018 4:38 am

Hi,
i would only control the ZD-553B not the vaccum pump. In the beginning of this thread was the talk of a PC Software. With this, the curve would to be adjusted and a new device will be added. Whrere can i find this Software. i Think the ZD-553B is PTC driven. Can everybody tell me how this is connected? No one has a desoldering gun in use?
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Re: Really universal soldering controller

Postby pkircher » Thu Oct 11, 2018 5:02 am

i doubt you find many of us using a desoldering iron on such an "expensive" station .. simply because it just drives half the unit + the components which you can desolder with such a gun/iron arent that sensetive to beginn with

anyhow

the software is inside the firmware zip ..
but the curve im talking about is the iron configuaration in code

and yes every custom iron will need such an part in code .. where you define id / the 2 resistors and the overall behavior of it

Code: Select all
  {
        0,
        0x020B,
        "ERSA RT80               ",
        {//-----------------------------------------------------------------------------------------
            {
                2,                          //Type
                {
                    0,                      //HChannel
                    5,                      //SChannel
                    0,                      //CBandA
                    1,                      //CBandB
                },                         
                167,                        //CurrentA
                0,                          //CurrentB
                0,                          //HRCompCurrent
                21,                         //Gain
                284,                        //Offset
                {                           //TPoly
                    -145.7299,              //c0
                    86.2582,                //c1
                    0,                      //c2
                    0,                      //c3
                    0,                      //c4
                    0,                      //c5
                    0,                      //c6
                    0,                      //c7
                    0,                      //c8
                    0                       //c9
                },
                -1,                        //WSLength
                0,                         //PID_DGain
                (UINT16)(0.4 * 32768),     //PID_KP
                (UINT16)(0.02 * 32768),    //PID_KI
                4,                         //PID_OVSGain
                80,                        //PID_PMax
                80                         //PID_PNom
            },
            {0}
        }
    }


anything inside //TPoly is the irons curve to balance the heating correctly
(the 10 c values )
sparky did not give us much information about it as of now - im hunting for the same infos
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Re: Really universal soldering controller

Postby pkircher » Thu Oct 11, 2018 5:41 am

i think i found what i was looking

projector42 posted something at page 106
https://github.com/ncp1402/ncp1402.github.io
that helps with the c-values


Image
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