6XD differential

HighFreq

Is it possible to setup the 6xd to use differential? I am using it with 1xd but i can't find the pins needed for differential on 6xd.

T3P3Tony

@highfreq the pins on the 6XD are 5V single ended, not differential. Can you let me know the driver you are using that requires differential input? Most allow for either single ended or differential, with the other input pulled to 5V or ground.

HighFreq

Using single headed now, problem is i can't reach 1000mm/sec with 0,001 increments , i have to use a multiplier.

dc42

@highfreq so you are looking for a 1MHz step rate? What driver do you have? Can your mechanics really position to 1 micron resolution?

HighFreq

@dc42 Driver is https://www.hiwin.it/images/download/documenti/E1 Series Servo Drive User Manual V1.7 (EN).pdf

Mechanics are based on linear motors and yes they can reposition with 1 micron res. Using 5x multiplier at the moment on a 6xd.

o_lampe

Would it be possible to use the driver expansion board made for Duet2?

dc42

@o_lampe @HighFreq yes using the EBOB would be possible. It would be necessary to pull the outputs from the 6XD (inputs to the EBOB) up to +3.3V or +5V using resistors.

We thought long and hard about including differential capability on the 6XD, but it needed a lot of additional circuitry and connectors, and most drivers can't use differential outputs. So instead we allowed for the possibility of attaching a daughter board to the 6XD to convert the outputs to differential. That's why the 6XD has mounting holes for two support pillars close to the driver outputs.

However, realistically the 6XD won't achieve a step rate as high as 1MHz anyway. In our tests we reached a maximum of 600kHz with just one motor moving.

HighFreq

@dc42 ok thanks, we will use multiplier.