Duet WIFI with Micron Cobra extruder temperature setting

Guyaros

After you'll fix the "hot wires" problem you should run Heater Auto PID tuning
Please read here before tuning:
https://duet3d.dozuki.com/Wiki/Tuning_the_heater_temperature_control

To run PID tuning in your case, use this command:
M303 H1 P1.0 S230

After the PID tuning is completed, write the command
M307 H1
and write down or print screen the tuning results.

then, edit your config.g file, and add this line:
M307 H1 Annnn.n Cnnn.n Dnn.n S1.0;
Replace nnn.n with the results from the PID tuning.

Saltypetz

So you want me to unhook the heater and put the meter on the heater wires. Is that what you want me to do?
If that is what you are asking me to do it is 600 - 700 on 2000k on the meter.
Can these extruders run off the board or should I put them on a different power supply. I don't want to burn up the board. I had them hooked up to the board and the shut down from low power. Right now I have them on a different power source with the tevo black widow mosfet. But the wires get hot hooked to the board or the mosfet.

Thank you

Guyaros

@saltypetz said

So you want me to unhook the heater and put the meter on the heater wires. Is that what you want me to do?

Yes, I want you to measure the resistance of the heater.

Take a picture of your multimeter, with the measurement you did, so I can help you further.
A reading of 600-700 it's not what it suppose to read.
I don't think 2000k mode on your DMM (Digital Multi-Meter) is the correct mode.

I think there is a language barrier between us, so please upload a picture.

As I said, the extruder heater supposes to be connected directly to the Duet.
But first, we need to investigate whats wrong with your wiring, because wires getting hot is not normal, and maybe you have kind of a shortage which causes a high current draw, or that you used very thin wires that aren't sufficient to handle high loads.

Saltypetz

There is no language barrier I understand what you want but I only have a junky meter at home. I can go get my Klein from my warehouse. But this meter will only work on 2000k nothing else.
I put a URL from photobucket but nothing shows up.
http://i1024.photobucket.com/albums/y301/loosewire1234/20180422_110352_zpshbnvi6rf.jpg
I am still trying to up load the picture but it is a Greenlee DM-20.
If I need to I will go pick up the meter now. Klein

Thank you for your help

Guyaros

Set the DMM to 200[ohm] mode.
The resistance of heaters (in general) is in range of 1.5 to 6[ohm], so you will need to use the minimal range of your meter which is 200 in your case.
If it's a faulty meter, then throw it away and get a new one.

I'm trying to figure out what causing the wires to get hot.
so please upload pictures of your wiring and connections to the Duet, this may help.

Saltypetz

Here are the pictures and I think it what you are asking me to do. I'm not a great electronics guy but i will try my best.
http://i1024.photobucket.com/albums/y301/loosewire1234/20180423_144447_zpsj3ljlw1p.jpg
http://i1024.photobucket.com/albums/y301/loosewire1234/20180423_144440_zpski3b8rjj.jpg
In the wifi software when I try to turn on the heater where it says Sensors it drop down to 5 vovlt and the fan on the power supply shuts off. Do I need to go get a Atx power supply. If so what Atx sould I buy. With nothing on there It's only 18.9 volts. Could this be the whole problem.

Saltypetz

I just hooked up the atx power supply and the wires still get hot but now faster. The bed heats up no problem at all. Should I hook up the other hotend to see if it has the same problem. Let me know what you think.

Thank you. You have been very help full.

Saltypetz

I can say for sure it not the Duet Wifi board I hooked it to a rambo and it has the same problem.

dc42

@saltypetz, photbucket does not let other people see your photos unless you pay them. So please host your photos elsewhere.

It sounds to me that you may have a shorted heater cartridge.

Saltypetz

It you add this to google chrome it works no problem.

https://chrome.google.com/webstore/detail/photobucket-hotlink-fix/kegnjbncdcliihbemealioapbifiaedg?hl=en

Saltypetz

I hooked up the second heater it works no problem wires are not hot. Bad heater out of the box. the wires are not even warm.

Saltypetz

It is all working now. Till the next problem. I still have to do the end stops and the motors. So I'm sure I will be back.

Thank you for all the help

Saltypetz

How do I make optical sensor work on the Tevo Black Widow. There is one link but not to much information.
Guyaros and dc42 you have been great help for a beginner.

Thank you