Re: [Emc-users] crazy #2

2020-12-01 Thread Gene Heskett
On Tuesday 01 December 2020 16:43:49 andy pugh wrote: > On Tue, 1 Dec 2020 at 21:40, Chris Albertson wrote: > > The next step is to see why PID is not very good at this. It is > > reactive and can't plan ahead.For example, it can't say "I am > > only a few floors away from my target I'd be

Re: [Emc-users] crazy #2

2020-12-01 Thread Gene Heskett
On Tuesday 01 December 2020 16:43:49 andy pugh wrote: > On Tue, 1 Dec 2020 at 21:40, Chris Albertson wrote: > > The next step is to see why PID is not very good at this. It is > > reactive and can't plan ahead.For example, it can't say "I am > > only a few floors away from my target I'd be

Re: [Emc-users] crazy #2

2020-12-01 Thread andy pugh
On Tue, 1 Dec 2020 at 21:40, Chris Albertson wrote: > The next step is to see why PID is not very good at this. It is reactive > and can't plan ahead.For example, it can't say "I am only a few > floors away from my target I'd better apply the brakes. That's exactly what the D term _can_ do

Re: [Emc-users] crazy #2

2020-12-01 Thread Chris Albertson
Funny, I just did another on-line class that covered PID.The behavior you describe seems to be common. The class used an elevator example and said it was 1,000 kilograms and used a 1,000 kg counterweight and we assume zero fraction.The car would shoot up the building and with all that mas

Re: [Emc-users] crazy #2

2020-12-01 Thread Gene Heskett
On Tuesday 01 December 2020 10:49:41 Gene Heskett wrote: > On Tuesday 01 December 2020 03:36:14 Gene Heskett wrote: > > Has anyone setup the at_pid to autotune at lcnc startup? > > > > If so, some good starting value suggestions would be appreciated as > > I've not a clue as to good values to use.

Re: [Emc-users] crazy #2

2020-12-01 Thread Gene Heskett
On Tuesday 01 December 2020 03:36:14 Gene Heskett wrote: > Has anyone setup the at_pid to autotune at lcnc startup? > > If so, some good starting value suggestions would be appreciated as > I've not a clue as to good values to use. I think one could use a > pyvcp led to indicate the autotune is do

Re: [Emc-users] crazy #2

2020-12-01 Thread Gene Heskett
On Tuesday 01 December 2020 03:36:14 Gene Heskett wrote: > Has anyone setup the at_pid to autotune at lcnc startup? > > If so, some good starting value suggestions would be appreciated as > I've not a clue as to good values to use. I think one could use a > pyvcp led to indicate the autotune is do

Re: [Emc-users] crazy #2

2020-12-01 Thread Gene Heskett
Has anyone setup the at_pid to autotune at lcnc startup? If so, some good starting value suggestions would be appreciated as I've not a clue as to good values to use. I think one could use a pyvcp led to indicate the autotune is done and ready for use. It seems to me that it could be used to co