em806 Senssorless Stall Protection fault

[m_c]

How do you know how to set the speeds of each motor to get the most with out problems?

Keep increasing the settings until the motors start stalling, then reduce them to create a bit of a safety margin.

You have to find a compromise between acceleration and max velocity though. With less acceleration you can ultimately get the motors to spin faster without stalling, however if you're planning on doing things that involve lots of small moves, then sacrificing top speed for acceleration, will often result in faster machining times.

[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.