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Hello!

So I have a V130-J-TR34 driving a Teknic Clearpath motor via PTO. The motor is connected to a THK Ball Screw Slide with a Turck "Home" Sensor wired into the PLC via Digital Input.

The current program basically homes the motor/slide to the sensor, and then the sensor goes high, I then trigger an immediate PTO STOP, followed by a re-set of the PTO Profile, then finally a PTO Set Home. The Read Status Current Position is getting set to 0 correctly.

Then, if I do a PTO Move to a target (ex: 150215)...the PTO actually sends it to 150245, +30 counts. BUT, if I then move it back to home, it goes perfectly back to 0, and if I do the same move again to 150215, it goes exactly to 150215, and is fine thereafter moving to any position. (Counts also verified via Teknic Drive Software)

Is there some trick to configuring PTO in either the Profile or Move blocks that I might be doing wrong?

Thanks!

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Totally left field, but maybe it's configuring itself on the first run, determining some sort of automatic ramp parameters to stop overshoot?

cheers, Aus

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Maybe you must try to use Joe Tauser PTO Example for test

I think the problem is in activating the stop function in homing via sensor.

You system see sensor and decelerate.
After that you must to give the command to return to 0 and only then go where you need to go.

 

 

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Is there any logic occurring accidentally on the home sensors negotiate transition?

Or

in getting the unit to stop does the home sensor remain on or does the slide actually move past the home sensor and end up re-triggering a piece of logic with an unexpected positive transition that it shouldn’t be during your first move?

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