On Tuesday 27 September 2016 23:52:56 Gene Heskett wrote: > Greetings all; > I have found 5 of the signals on this strange bob, the only 5 in this > simple config. So I have faith I can find the others as I need them. > > To say that this board is scrambled is a bit of an understatement. > > This vfd's little booklet I have does show a potential rs232 port, but > the socket is not to be found. So I am stuck running it with a pwmgen > pulsing the 5 volt analog in (pin 3) at a high enough rate it > integrates to analog in its noise filters. The vendor has assured me > that works fine. > > I am however, wondering if the pwmgen has more than one default mode, > as this vfd needs 2 separate run-fwd (pin 8) and run-reverse (pin 9) > input lines in addition to the analog 0-5 volt speed command. If it > had a mode where it grabbed pins 15 and 17 for those two run signals, > it would save some hal trickery. Is there such a mode? > > It does have a 5V Fout (pin 6) but does not say if its a pulse > frequency at motor drive, or an integrated analog voltage. In either > event, I do not believe its 5i25 compatible, but might be able to > drive a separate dual slope integrating voltmeter if it was range > calibrateable to show freq or rpms. That would give the operator, me, > feedback on when it was time to change belts or backgears. Sitting on > the table, running free, I'd say mininum drive hz in any 5 minute > period should not be less than 30 hz as the vfd can throttle the > current, but it throttles it at about what a 1.5 horse motor would > draw at rated speed at full load, IOW its warming up the coils of a 1 > horse rated motor. With fresh bearings in it, I have run it up to > 200Hz, (4 pole motors, so thats about 6 grand & I worry about the fins > on the fan) but I doubt it has usable torque as the current draw is > well under an amp/phase then. Same effect on power that the inductance > of a stepper causes. I'll no doubt find out when I do load it up. > > It would be nice if a firmware for it could be cobbled up as 4 axis + > 1 encoder & one pwmgen on P3, and a menu of serial ports on P2. That > would make a one size fits a lot more board for sure. I'd like to be > able to talk to it and get usable data from someplace besides the > encoder. > > Thanks everybody. > Apparently they are not the same. An attempt to use mode 0 was canceled by hal at machine enable time, a nice red marked popup said it was reverting to mode 1, this despite the fact that I had setup the pwmgen.value input to be the ABS value, and had synthed the fwd and rev signals from motion's outputs.
So I tried mode 4 which the error message suggested, no runtime errors, but pwm was on pin 16, and pin 14 was silent. So how to satisfy this vfd? Needs a positive speed pwm, and a positive for run fwd, and a positive for run reverse, presumably mutually exclusive. I've about sorted the bob itself. And I did slam another connector on the cable to I could try the cnc4pc C1G, but immediately ran into the all outputs high when lcnc isn't running. That would likely confuse the heck outta this phony vfd. So I am back to this BoB. And according to what I've found, I still have gpio.009, pin 6 thru 012, pin 9 to play with as outputs. So next I'm going to ignore its direction output, and see if I can use 2 of those 4 outputs for the direction pins. First, see if it works for fwd. I think I did see that working once in mode 1. Some docs on the 5i25 version of the pwmgen sure would help explain this. Does anyone have any? Thanks all. 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) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
