Connection and configuration of a stepper driver Nema 24

Woelkchen

Hello everybody,

I have a problem here with a stepper motor. As part of a project at the university I would like to connect a stepper motor Nema 24 to the Duet Ethernet. This should be used as an extruder motor and therefore requires a relatively high torque. Here are some specifications and also the link to the stepper driver:

current per winding: 3 A/winding
-holding torque (bipolar): 353.55 Ncm
restistance per winding: 1.3 Ohm
resolution (°/step) 1.8 °/step

https://de.nanotec.com/produkte/560-st6018l3008-b/

Now my question, can I connect this stepper motor to the Duet? If so, how can I configure the motor in the firmware?

Thank you!

OBELIKS

This should help: https://duet3d.dozuki.com/Wiki/Using_external_stepper_motor_drivers

dc42

@woelkchen said in Connection and configuration of a stepper driver Nema 24:

Now my question, can I connect this stepper motor to the Duet? If so, how can I configure the motor in the firmware?

Yes you can drive that motor directly from the Duet. The maximum output current of the Duet is 2.4A which is 80% of the rated current of your motor, which should be sufficient.

In your M906 command in config.g, use E2400 to set the current to 2.4A (or less if you don't need quite a much torque). You will need to use a fan to cool the Duet, see https://duet3d.dozuki.com/Wiki/Mounting_and_cooling_the_board#Section_Cooling.

Woelkchen

@dc42

In your M906 command in config.g, use E2400 to set the current to 2.4A (or less if you don't need quite a much torque). You will need to use a fan to cool the Duet, see https://duet3d.dozuki.com/Wiki/Mounting_and_cooling_the_board#Section_Cooling.

I did exactly what you said. But the stepper motor shortly vibrated and then the driver burnt out. Maybe there is a mistake in the wiring of the motor. We have an 8-wire cable and we wired it like this:

What went wrong?

JoergS5

@woelkchen I would say you connected as serial and on the left you see the AMP for serial is 2.12 A, not 3. So setting in Duet should be lower, say ~~1800~~ 1700.

dc42

I agree, the Duet should have been set for a lower current. However, that doesn't explain why the driver failed. Are you sure that you had the stepper motor wires connected correctly to the Duet? That is, blue/white and red connected to two pins one end of the 4-pin connector on the Duet, and green/white and black connected to the twp pins at the other end. With blue connected to red/white, and green connected to black/white.