If you slow down the feed speed, does the cutting measure various stay the same or improve (or get worse)?

The yaskawa servo has its own programming right?  It is basically doing all the work rather than trying to do motion control in the s7-1200 right?  You just have things like home, fault reset, go program 1, go program 2, or something like that?  Or are you trying to do fast motion control using the PLC to close the positioning loop?

It would help to know your control strategy and what firmware plc, and what version of tia portal.

DougPin

hello experts.

I'm with a big problem. I have a flying cutting machine, cutting measures vary widely. WHAT know can not be, do you guys mind?

The screw is configured correctly, the timing is perfect with the material.

I have used the S7-1200 and Yaskawa servo motor.

In reading through the description of the problem, it sounds like it starts to lose count of position and not move fast enough to cut right - assuming the HSC input is measuring and a short measurement would cause the width variation you are experiencing.

It may be a bad connection on the high speed count, noise or something like that.

For testing purposes only, it is feasible to run the HSC signal outside all the wiring conduits and wire-ways?

If so, you can quickly determine if that is the problem.  If it turns out to be the problem, you may consider running the HSC input signal in a separate conduit end to end to protect it from noise sources.

If you cannot do that easily - again, just for testing, you may want to do some experiments.

Measure the motion.  Count the counts.  Do the math and see if it is the right number of counts for the motion.  If you are getting the right counts, what is different during your experiment compared to running?  Whatever is not running is a potential noise source.

I hope this is making you think about the problem from a different perspective though it may not be any use at all solving your problem.  More about thinking about how to find the problem than guess.

DougPin

I'm using a pulse train control for the Yaskawa servo motor.

My strategy is:

1) Yaskawa servo motor control via PTO

2) Use the HSC to measure the linear speed cutting and

3) Use "Move Velocity" block to make the cut

The variation is independent of speed, both low (200mm / s) and for high (500mm / s) does not exist an error pattern. The first pieces are cut within a range of 1-2mm.

hardware:

* S7-1200 Firmware 3.0

Step7:

* Tia Portal V13SP1

Annex the project.

Hello experts!

I used a separate source for encoder supply but the problem persists.

where I might be missing?

New question published by Vo Trong Nguyen is split to a separate thread with the subject How to syncronized the shear and material ( both cutting position and speed to get the length exactly)?.

Best regards
Jen_Moderator