Closed loop drivers location

mihai.zamfiraz

Hello,
I am in the process of building a full frame CNC with 2 Nema 34 motors on the y axis and 1 Nema 34 motor on the X axis.
I would like to put the drivers that control the motors on the aluminum profile that represents the X axis (the mobile one) and not put them in a box on the CNC metalic frame . I must mention that each driver will be controlled through a duet 3 expansion 1XD.
For the moment I see the following as advantages:

short cables between motor and controller.
fewer cables to pull because I will need only the power cable and the cable for CAN communication between 1XD boards.
because I will have the 1XD extension boards on the mobile axis of the CNC, it will be easy for me to interface them with other sensors in the future

As disadvantages:

I add approximately 1.5 kg more to the mobile assembly
possible problems caused by the generated vibrations.

What do you think?

dc42

@mihai-zamfiraz which Duet will you use to drive the 1XD boards? Have you considered using a Duet 3 MB6XD and no 1XD boards?

mihai.zamfiraz

@dc42 said in Closed loop drivers location:

Duet 3 MB6XD

Yes,
i use Duet 3 MB6XD board and 4 extension boards 1XD in order to comand closed-loop drivers. The drivers which are on Duet 3 MB6XD board are not capable to control closed-loop (HBS860H) drivers.
Also, all nema 34 motors are 12Nm with an 6A curent at 60v DC.

jay_s_uk

@mihai-zamfiraz are you confusing the 6HC with the 6XD?

mihai.zamfiraz

@jay_s_uk
yes, you are right. my board it's a 6HC model.

mihai.zamfiraz

@dc42

To answer your question correctly, I started this project a year ago with the purchase of the 6HC board and now I have all the components and it is difficult/expensive for me to switch to 6XD (maybe in the future).

baird1fa

@mihai-zamfiraz I have a setup similar to what you are describing, I have a duet 2 wifi with the external closed loop drivers. Mine are all mounted in the box and I ran long cables for the encoders and the steppers. What you are suggesting would work fine I would think. The CAN should be suitable for long runs of cables and immune to signal noise. Be sure to use a shielded cable for the spindle power.

mihai.zamfiraz

@baird1fa thanks, i will come back with my feedback when my CNC will be ready.

mihai.zamfiraz

@mihai-zamfiraz
I'm back with news about positioning the drivers close to the nema34.
Everything worked perfectly until a few days ago when one of the drivers broke, in my opinion due to vibrations. Therefore, I do not recommend positioning them close to the nema34 stepper motors.