Hello again guys. Just to tell you. I finally took the drive apart and made some checks. Turns out one of the IGBT modules is shorted. So I'll replace that and it should be working again.
El mar., 13 de junio de 2023 05:08, gene heskett <ghesk...@shentel.net> escribió: > On 6/13/23 01:41, andrew beck wrote: > > Just to confirm also > > > > Gene. > > > > My vfd only holds the motor at full torque to resist loads briefly. > > > > So it never actually causes problems > > > > > > I think the rating is 1min at the 150 percent rated torque. > > > > So it's only to respond to forces and make a good fast pid loop > > > > Not to run that way all the time > > > It appears fanuc thought of that better than linuxcnc does, altho it may > be possible where the vfd is controlled by something like the serial > interface I'm using on the 6040 mill, which speaks rs485 to control its > water cooled spindle. But thats a 24k rpm spindle which I don't run > below 2k and it doesn't have much torque at 2k and it warms the water up > pretty fast below 8k. In this case however, the pid is in the vfd, and > appears to be quite tightly controlled. Apparently the vfd autotunes. > That one Just Works so I haven't investigated further. No pids involved > anyplace else except the one in the 3 phase stepper/servo on axis B. > Ditto my sheldon lathe, which now has 3 phase stepper/servo's, with the > loss of home signal stopping linuxcnc in its tracks by e-stop linkage in > the hal file, in about a millisecond. Works when tested, has yet to trip > in use. > > I do use a pid on the other mill, a g0704 which has a 1hp rated brushed > dc motor controlled by one of Jon's pwm-servo drivers, that control is > very tight, no audible rev change right up to stall but I hear the iron > in the motor squeaking as the servo amps current limit, set at 2x the > motor nameplate FLA, kicks in. Been running that way for around 8 years > now, still on the original brushes. Because Jon's amp is full 4 quadrant > control, the rigid tap turnaround voltage hits about 170 volts for a few > milliseconds, 125 normally on a 90 volt motor. All this isn't much use > to you though, just stating what can be done with linuxcnc. > > Thanks for the clarification Andrew. Take care & stay well. > [...] > > Cheers, Gene Heskett. > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author, 1940) > If we desire respect for the law, we must first make the law respectable. > - Louis D. Brandeis > Genes Web page <http://geneslinuxbox.net:6309/> > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
