Powering 12V extruder with 24V power supply.
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I purchased a 12v 50w extruder unknowingly while I have a 24V 350W power supply. I know for fans on a Duet 3 6HC mainboard, there is an internal voltage regulator that will prevent damage to the fans. Will this same regulator protect the heater and thermistor of my extruder? I have tested stepper motors and duet web control tells me that I get 24V in, but only 12V go to the stepper motors. Is that discrepancy because of the internal regulator? If so, Does the voltage regulator protect the out1-3 or temp0-3 ports? If not, would the external regulator circuit for lower rated volt fans on boards before duet 3 work the same for regulating the out and temp ports or is there something else I should do?
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Will this same regulator protect the heater and thermistor of my extruder?
No.
I have tested stepper motors and duet web control tells me that I get 24V in, but only 12V go to the stepper motors.
Where does DWC tell you about the voltage going to the steppers? Can you illustrate this with a screenshot?
Does the voltage regulator protect the out1-3 or temp0-3 ports?
For technical information, please study the Duet 3 Mainboard 6HC document carefully. The section Description of Connections provides the overview in detail. In addition, you may want to have a look at the Wiring Diagram, there, all ports and connectors are colour coded to get an idea.
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@CNCsimon said in Powering 12V extruder with 24V power supply.:
12v 50w extruder
When you say extruder, I assume you mean the heater. There is no safe way to connect this heater to the Duet if you have 24v power supply. You're far better off returning it and getting a 24v version.
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It says v12 which is probably what I thought I was seeing with voltage to the motor. It is too late to return my extruder so I will probably just get a 12v power supply. Unless there is some other way to regulate the voltage?
I have a switching power supply that I can change the potentiometer to get down to 21.6V but this probably is not enough.
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@Phaedrux What about just getting a 12V power supply? I dont know if this will affect the torque of my motors, but I am using a 4.25:1 gearbox ratio to get better holding torque anyway.
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It is too late to return my extruder so I will probably just get a 12v power supply.
Let's see: Looks like your extruder consists of the extruder (in the narrow sense, i.e. a stepper motor to feed the filament) and the hotend, which typically incorporates a heater cartridge, a thermistor, some heatsink and a fan to cool down the cold side of the hotend
As you've already noticed, the fan is no problem, your Duet can provide 12V for that. The thermistor is a no-brainer, too. Better yet, you don't need to worry about the voltage for the stepper motor: the drivers on the Duet take care of that. So you are left with exactly one issue: the heater cartridge. As @Phaedrux says, there's no safe way to run a 12V heater with 24V.
I can change the potentiometer to get down to 21.6V but this probably is not enough.
Correct. You need a heater specified for 24V. Depending on your extruder, it might be possible to simply replace the heater cartridge. Can't tell that from a distance; please provide an image of the extruder to get an idea.
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@infiniteloop I have purchased the mahor v4 pellet extruder at 12v and 50w. I thought about this solution. I know the thermistor is a common replacement(although I won’t have to), but the guide for the extruder only specifies the dimensions of the heater, not a specific product. I’m pretty sure that the heater is no more than just a resistor and I can find a heater meant for 24v. The difficult part is finding the right dimensions. Otherwise, Maybe get a step down converter rated for my heater.
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I have purchased the mahor v4 pellet extruder
Looked that up: quite a special device, indeed
Found a link with some schematics: Instrucciones de montaje. My knowledge of the spanish language is not only limited but non-existent, but in one of the images (slide #4), I see a heater block which takes two cylindrical insertions: the smaller one being a thermistor, the thicker one is the heater cartridge ("Calentador"). That's the thing to replace.
To make it short: That's a common part you can buy for little money on eBay or Amazon. Must be compatible with V6-style hotends, so: diameter 6 mm, length 20 mm, 50 W, 24 V. No need to panic, that's cheap and easy to replace.
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It says v12 which is probably what I thought I was seeing with voltage to the motor.
Sorry, didn't spot your link in the first place. Yeah, DWC simply monitors the two relevant voltages which you might want to watch in case of an under voltage event, but the 12V do not relate to the steppers. It doesn't matter anyway, as you can simply replace the heater cartridge. Good luck with that
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@infiniteloop I will buy a new heating cartridge. I just realized I didn’t even use thermal paste so I’m going to have to take apart the block anyway. Thank you for your help
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