5i25 + 7i85s +....

Emanresu wrote: Above 2m/min i run into joint following error at the "Down-Ramp"
Up-Ramp and Movement up to 30m/min everything is just fine.
But as soon as i lift my Finger from the Arrow-key... GANG, fullstop.

This might be because the drives are not actually capable of braking fast enough.

But, it can also be caused by not setting a DEFAULT_LINEAR_ACCELERATION in the [TRAJ] section of the INI. So try that first.
linuxcnc.org/docs/devel/html/config/ini-...g.html#_traj_section

So i guess there is no other input PIN for axis then axis.0.motor-pos-fb.
Some Kind of "just look, dont use" PIN.

Here we go: No DEFAULT_LINEAR_ACCELERATION

I just dont understand why ACCeleration works and DECeleration leads into an error.

I use Leadshine EL5-1500. They have an integrated oscilloscope.
At an Acceleration of 100 ive just 0,008 missmatch. And at 500 like i set in Linux just 0,002.
Schould be ok tho. (2500 line encoder. So it wont be more precise then 0,002 anyway)

Does adding the DEFAULT_LINEAR_ACCELERATION fix the problem?

Nope, still the same.

I also wonder how TRAJ works together with AXIS.
For example changing MAX_LINEAR_VELOCITY in TRAJ seems to affect nothing.

Are you using encoder feedback to close the position loop?

If so, loop tuning will be quite different than the local stepgen tuning

The [TRAJ] settings only really have much effect with non-identity kinematics (which can include gantries, sometimes).

Is your stepgen_maxaccel bigger than the joint accel limit? (it needs to be, to give a bit of headroom)
Is LinuxCNC using the encoder or a step-generator to drive joint.N.motor-pos-fb ?