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, 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/javaone _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
