Step Servo motors on Duet 3 boards

selva_tvi

Hello All,

We are planning to make 500x500 CoreXY IDEX

We wanted to use Step servo motors to control X, Y and U axis.

Z - 03nos with Nema 17 Steppers and E - 02 nos with Nema 17 Steppers

Total - 08 motors.

We are planning to use Duet 3 6XD. So, we can connect 6 motors in the main board and two nos in the expansion boards.

Is it possible to use 'Duet 3 Expansion Board 3HC' for connecting the two steppers directly?

What we observed in Duet 3 6XD is it has all 6 connections for external stepper drivers. What way we can connect the standard stepper motors? I read this documentation and found external 'Breakout Board For A4988 Stepper Motor Driver' can be used. Is it possible to use TMC2209 in that?
Planning to use the following Step Servos:
https://www.omc-stepperonline.com/ess-series-1-2nm-170oz-in-nema-23-integrated-closed-loop-stepper-servo-motor-24-50vdc-1000cpr-ess23-10

The main objective is to print faster. In order to prevent skipping, we plan to use these Step Servos.

If any one used it and please guide me on the right path. Thanks

dc42

@selva_tvi said in Step Servo motors on Duet 3 boards:

We are planning to use Duet 3 6XD. So, we can connect 6 motors in the main board and two nos in the expansion boards.
Is it possible to use 'Duet 3 Expansion Board 3HC' for connecting the two steppers directly?

Yes. If the motors don't need a lot of current, you could use two TOOL1LC boards instead. If one or both of the motors is on the tool head, this will also reduce the wiring.

What we observed in Duet 3 6XD is it has all 6 connections for external stepper drivers. What way we can connect the standard stepper motors? I read this documentation and found external 'Breakout Board For A4988 Stepper Motor Driver' can be used. Is it possible to use TMC2209 in that?

Yes, but you won't be able to control the driver parameters via SPI or UART.

selva_tvi

@dc42 Thanks for the support.

I have seen most of the people have used Clearpath Technik Servo motors.

I don't want that costly option.

Is the Step servos a right option? If yes, can you pls guide for the proper documentation or any existing forum thread which have used already?

There is a document for connecting external stepper drivers. But I am not able to find it for Step servos.

selva_tvi

@jay_s_uk @Phaedrux Could you please support me on this? Thanks

jay_s_uk

@selva_tvi I believe it should be the same for step servos. I.e. step, direction and enable. I've not connected up the servos I have yet.

dc42

@selva_tvi said in Step Servo motors on Duet 3 boards:

There is a document for connecting external stepper drivers. But I am not able to find it for Step servos.

Step servo drivers with the usual optically isolated inputs, such as the one you linked to, can be connected to the Duet 3 MB6XD in exactly the same way as external stepper drivers.

We also have the EXP1HCL expansion board, which drives a single stepper motor with encoder.

selva_tvi

@dc42 said in Step Servo motors on Duet 3 boards:

Duet 3 MB6XD

Thanks for the reply. Will start working on that