em806 Senssorless Stall Protection fault

[charlieuk]

cheers well I had a go at this today and I got them all working nice and got them all a lot faster however went to run a file and when it did some very small z moves it started tripping out again so I had to massively reduce the z back down again especially with the acc. Im wondering if maybe changing the ball screw would help so the motor was spinning a little faster and the weight of the z was overcome a little more, I think its on a 1605 at the moment.

[m_c]

How are your motors driving the ball screws? Direct, or via belt?
What kind of speeds are you getting?

[charlieuk]

the y and z are on belts and I have the z with 20t on the motor and 50t on the ball screw. I will have to cheque the speeds tomorrow as I went through so many I have forgot. many thanks

[m_c]

You should be able to get a reasonable speed out the Z.

For comparison, I was tuning my Triac last night, and I was getting 2.2m/min with 500mm/sec2 acceleration on the Z, and that's with an old big round stepper driving a 5mm pitch screw with 12:30 gearing via a belt. Now I doubt your Z assembly is as heavy, and you'll be using a more modern motor.