On Tuesday 08 April 2008, Geert De Pecker wrote: >Jon, Gene, > >The Vref's is correct. I've checked these and for the new board version >(the 4 axis) it is around 1.8V and for the old board approx 3V. > >What bothers me the most is that I have the problem on both the old 3 >axis and the more recent 4 axis board which I guess would rule out the >xylotex board as the problem. > >I guess the only option now is to make a small pulse generator on the >breadboard with a 555 timer and use this as input directly to the >xylotex in order to either rule out or define the xylotex board as >problem source. > >It could also be the cnc4pc breakout board.... > >Many thanks,
I made my own breakout originally, but now we have a rewired hal to do that. Since you have indicated you a scope, why not just take a look at the db25 end of the cable & see if the signals are getting to the right pins? That might get you some useful info faster. >Geert > >Gene Heskett wrote: >> On Monday 07 April 2008, John Kasunich wrote: >>> Geert De Pecker wrote: >>>> Guys, >>>> >>>> I'm getting lost here: >>>> >>>> - attached the old 3 axis xylotex: same problem >>>> >>>> - hooked up the scope to watch the step signal: step high approx 3 us. >>>> Should be ok as xylotex says 1000 ns minimal. 5 volts. >>>> >>>> - at approx 1000 Hz pulses seem ok. a little twitchy on the scope >>>> screen. >>>> >>>> - attached older pacsci motor: same problem. No torque at all. >>>> >>>> - voltages to the xylotex board ok: 29V and board gives proper 5 volts >>>> >>>> Don't know what next to do. Any hints more than welcome. >>>> >>>> Thx for listening, >>>> >>>> Geert >>> >>> If you have very low holding torque even at zero speed, the most likely >>> cause is low motor current. >>> >>> The xylotex boards have pots to set the motor current. Are you sure >>> they are set correctly? If I recall correctly there is a test point, >>> you put a meter on it and adjust the pot. The manual has a formula that >>> lets you determine the proper test point voltage based on your motor >>> current specs. >>> >>> Regards, >>> >>> John Kasunich >> >> These are tpx, tpy and tpz, the voltage is read from these to the - rail >> of the power supply at the boards power header, and are to be adjusted >> with all motors DISCONNECTED but powered normally. On old style boards, >> about 3.4 volts should get you about 2.4 amps when the motors are >> re-connected. Do NOT, under any conditions, set for more than 3.6 volts. >> That will break the mirror and let all the magic smoke out. Then it >> doesn't work anymore. > >------------------------------------------------------------------------- >This SF.net email is sponsored by the 2008 JavaOne(SM) Conference >Register now and save $200. Hurry, offer ends at 11:59 p.m., >Monday, April 7! Use priority code J8TLD2. >http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javao >ne _______________________________________________ >Emc-users mailing list >Emc-users@lists.sourceforge.net >https://lists.sourceforge.net/lists/listinfo/emc-users -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Don't lose Your head To gain a minute You need your head Your brains are in it. -- Burma Shave ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Register now and save $200. Hurry, offer ends at 11:59 p.m., Monday, April 7! Use priority code J8TLD2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
