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Topic: Really universal soldering controller (Read 809038 times) previous topic - next topic

Re: Really universal soldering controller

Reply #2836
Have you guys seen the new Otter-Iron Pro v2.0 by Jan Henrik?
Well, "Works but not that great, rebuild at your own risk. :)", not inspiring great confidence. )
I'm personally not a big fan of such board to board joints.
It's not universal.
PD can only provide 20V/100W.
Display is even smaller. =)
But overall design is nice and compact.

Re: Really universal soldering controller

Reply #2837
Also you can compare your voltages with afedorov's voltage table at a page 137
I did this with a 1k resistor and then with 10ohm resistor at Vout1- to SenseA:
Location10 Ohm  Cal1k Ohm CalPage137 Reference
U14:22.044v2.044v2.1v
U12A:32.70v - 2.74v2.70v - 2.74v2.7v
U16A:20.004v0.32v - 0.35v3.8mv (0.0038v)
U18B:50.004v0.32v - 0.35v3.8mv (0.0038v)
U13A:10.112v - 0.116v2.81v - 2.96v106mv (0.106v)
U17:30.055v1.35v - 1.53v53mv (0.053v)
U17:61.34-1.41v2.78v - 2.92v1.5v
U18A:3-0.001vnot tested0v


To short a bit the efforts, measure Vtemp (Volt. drop over C65), the time you turn the RC2 and just to be sure same procedure at C62, while is connected calibr. R and you are in calibr. menu

I did this with only 10 Ohm resistor in place (Vout1- to SenseA), and in cal menu:
Rc2 full counterclockwise:
C65: 0.102v steady
C62: 1.23v-1.30v fluctuating

Rc2 full clockwise:
C65: 0.128v - 0.130v fluctuating
C62: 1.58v - 1.66v fluctuating

I have also ordered a better multimeter (used fluke 87iii) which should come in the mail by Monday.

Thanks for the help!

Re: Really universal soldering controller

Reply #2838
I did this with a 1k resistor and then with 10ohm resistor at Vout1- to SenseA:
It's a little bit off, but I'm sure it's due measurement/identification. At least it's not 6 times lower. It seems diff amp is working OK.
Some fluctuation is normal as MCU interrupts calibration for tool ID at around 5Hz.
Try to adjust the current by up/down buttons in the calibration menu and check if voltages changes accordingly.
Check reference voltage on C44, should be 3V.

Forget about 1k resistor, it was only needed to check current source section, which works fine on your board.

Re: Really universal soldering controller

Reply #2839
Which voltages would I expect to change when I adjust current? I'm guessing the the 3.8mv should scale with the the current? (e.g. if I go from 128 to 64, I would expect to see 1.9mv?)

Re: Really universal soldering controller

Reply #2840
Try to adjust the current by up/down buttons in the calibration menu and check if voltages changes accordingly.
Check reference voltage on C44, should be 3V.

C44 is measuring constant 3.000v

I took all the measurements with the 10ohm resistor, and with cal menu current set to 64 and 256 (128 column is copy from before). '~' means that the measurement is still fluctuating, but I took an approx number in the range.

LocationCurrent 128Current 64Current 256
U14:22.044v2.044v2.044v
U12A:32.70v - 2.74v~3.0v~2.18v
U16A:20.004v0.002v0.008v
U18B:50.004v0.002v0.008v
U13A:10.112v - 0.116v~0.065v~0.21v
U17:30.055v0.032v0.102v
U17:61.34-1.41v~0.69v~2.76v

Re: Really universal soldering controller

Reply #2841
Which voltages would I expect to change when I adjust current?
All the voltages along temperature measurement path. Linear dependency on current: two times less the current - two times lower the voltage. Your voltages seems perfectly fine. Only R55 separate U17:6 with ADC input, but it's unlikely the cause of the problem.

Re: Really universal soldering controller

Reply #2842
Spiftacu1ar, can you check -0.6V at U18 and U13 , also at your  picture is not good visible b/n caps  C36, C37 and ADG734 for a left residue of a flux

Re: Really universal soldering controller

Reply #2843
Spiftacu1ar, can you check -0.6V at U18 and U13 , also at your  picture is not good visible b/n caps  C36, C37 and ADG734 for a left residue of a flux

U18:4, U13:4, and input at J9 are all -0.683.
However, if I unplug J9, the input power changes to -0.589v.
I suspect something might be wrong here?

Also, the new meter came in the mail today. I am measuring 2.8mv where expecting 3.8mv (measured 0.004v or 4mv on old meter)
If I remove 10ohm resistor, I get ~343uA, consistent with my measurement with 1k resistor.

I took the pictures directly after reflowing, but cleaned the flux before powering it on.


Re: Really universal soldering controller

Reply #2844
Your voltages seems perfectly fine. Only R55 separate U17:6 with ADC input, but it's unlikely the cause of the problem.
Based on this, I measured from r55 to u5, and found a few ohms of resistance.
Reflowing all of U5 seems to have fixed my problem.
With no resistor, adc is steady 1023, and R is steady 2087. Room is steady 24.

With resistor, I have adjusted it to 1000, but the last digit still fluctuates rapidly (999 to 1001). If touch the board by the edges, the number drops to 991. Is that normal? Or is there still an issue?

Re: Really universal soldering controller

Reply #2845
Based on this, I measured from r55 to u5, and found a few ohms of resistance.
Reflowing all of U5 seems to have fixed my problem.
With no resistor, adc is steady 1023, and R is steady 2087. Room is steady 24.

With resistor, I have adjusted it to 1000, but the last digit still fluctuates rapidly (999 to 1001). If touch the board by the edges, the number drops to 991. Is that normal? Or is there still an issue?

it's all okay, depending on PCB quality, used dielectric material (controlled impedance, etc) it can flactuate between 1000 and 1040 within 1 sec...

Re: Really universal soldering controller

Reply #2846
Talkos privet,

What sockets and plugs are used for nano tools? Want to keep original connector.

Also can you share wiring diagram for nano pensil and nano tweezers?

Also do you mind sharing your HW and FW for auto switching between 12V and 24V?

Sposibo,
Mantas

Edit1 I assume nano tweezers wiring is identical to micro tweezers.

What about pensil is wiring identical to T245 or to T210?

Re: Really universal soldering controller

Reply #2847
Скину все чуть позже ;)
I will throw everything a little later;)

Re: Really universal soldering controller

Reply #2848
Скину все чуть позже ;)
I will throw everything a little later;)
Thanks, I will upload evrything too hopefully over the weekend couldn't keep paying for the server so had to shutdown it now setting build server on unused thinkpad x230

Re: Really universal soldering controller

Reply #2849
. . .
Also do you mind sharing your HW and FW for auto switching between 12V and 24V?
. . .
You can increase the control over heater not only by limiting supply voltage 2 times, but also by increasing the work frequency by 2( to help to PWM for that specific load) . In both cases you will reach the same result and save hardware implementations, but this will eat your program time.  Or at least to decrease min pulse width for that tool