Dc servo motor control

Joeymcc wrote:

My motors keep moving by themselves, both x and y axis, x is on the gantry and is a single motor, encoder and motor direction is correct, I have tried adding "-" values in the ini file to try different motor and encoder direction but no help. They move even when analogue signal wires are completely removed. This happens in the pncconfig, in linuxcnc it errors as soon as i to turn on with joint follow errors 

 

That is normal in velocity servo drives.
Make sure that when LinuxCNC errors out with joint following error, the enable goes off and the drives stop moving.
If the motors are moving before pressing "enable" in LinuxCNC, do not proceed to try tuning, that usually ends up in tears.
Enable HAS to be be controlled by LinuxCNC, that is not negotiable on velocity servo systems.

Nice, now you should refer to the tutorial about servo tuning, go step by step, no skipping. Do that for a single axis only, only after having one axis working continue to the next as trying to do everything at once will very quickly become frustrating and yield no results. This can be done after being able to enable the machine and no errors until you try to jog and no motors are moving on their own.
You can use an android phone or tablet with any software that uses the built in sensors by looking at the accelerometer while the phone is standing on or near the motor. That way you can see from far away how much the machine is vibrating while setting the P gain. I think i have pictures of it on that tutorial.

Tandem axis/joints/motors must have -1 in home_sequence, otherwise it will not jog. Even when set correctly, it will not jog before homing the machine.
So since the Y axis is moving and homing, set it to -1 and give it a try.
Just for kicks, set to to home slowly and set the offset of one side 2mm more, never gets old looking at that !
Yeah also very useful to make sure the sensor for y2 is actually y2!