Duet WIFI with Micron Cobra extruder temperature setting
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Which heater wires are getting hot: the bed heater wires, or the extruder heater wires?
What is the power rating of the heater concerned, and what thickness wires are you using?
If you are using 24V power, are you sure that the heater is a 24V heater not a 12V heater?
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The extruder wires are getting real hot but I turned it off. The extruder is on a 12V 25A power supply.
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This is from the Micron support page.
Electrical:
Step motor connections
Connect the motor wires according to the attached motor spec.
If you are working with 24V Power supply, reduce the driver (pololu or similar) to about 50% current. This
can be done by: disconnect PS, rotate the current pot fully counterclockwise and then about 1/8 of a turn
clockwise, connect the PS and check if the extruder stepper motor able to extrude the filament without
losing steps (don't forget to turn on the heater).
Another approach to reduce the current is in the firmware configuration, this can be done only if you have
a controller and drivers that support this.
NTC thermistor
The thermistor type is: 100K ohm EPCOS B57560G104F NTC THERMISTOR
Polarity for the NTC is not important. Connect it to the Temperature input on the
Ramps/Sanguilolu/Smoothieboard/Etc.
For Marlin firmware, the thermistor number is type 1.
Heaters
Micron 3DP extruder's heaters are rated for 12V and about 60W (120W for the dual extruder). Make sure
your board fuse can handle that.
It is possible to operate the heaters using 24V PS. In this case, reduce the power to 60 % by changing the
heaters parameters in the firmware. In case of using Marlin firmware, you should look for #define
PID_MAX 255 in configuration.h file and change it to #define PID_MAX 155
Polarity for the heater is not important; just connect it to the heater exitThank you for the help
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Cobra extruder is available with 2 voltage configuration: 12[V] or 24[V].
the difference between the configurations is the Fan voltage rating and Heater resistance.
Also, there are several heaters options: 50[W] / 64[W] /100[W].
Duet extruder heaters can output 9[A], so for 12[V] the power output is 108[W], so no problem at all.
Please measure the resistance of the heater you have, using Digital Multi Meter, and report here.I have never experienced a situation where the heaters wiring of the Cobra got hot. Please take a picture of your wiring. This is very odd.
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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_controlTo run PID tuning in your case, use this command:
M303 H1 P1.0 S230After 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. -
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
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@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. -
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. KleinThank you for your help
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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. -
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. -
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.
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I can say for sure it not the Duet Wifi board I hooked it to a rambo and it has the same problem.
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@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.
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It you add this to google chrome it works no problem.
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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.
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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
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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
