G76 problem

Do you have a circuit diagram for the stepper drive control pins?

andypugh wrote:

Do you have a circuit diagram for the stepper drive control pins?

I used this diagram that I found on the net.

That's the BoB, not the stepper drive.

andypugh wrote:

That's the BoB, not the
step​per drive.

are you referring to this?

Yes. That indicates that the drives use differential inputs, so as long as you have 7i76 step + to drive step + (and so on) then it isn't a step polarity issue.

I've found another manual for the T60 drive here: www.rtelligent.net/upload/wenjian/Steppe...%20User%20Manual.pdf

I think you should have a look at sect 4.5 related to SW8.
In your manual it is for the bandwidth selection but in the manual linked above it is for Open/Closed loop selection, According to the pdf manual (above) SW8 should be set to 'off' for closed loop mode.

This is quite strange since just about everything else is identical in both manuals.