On 01/02/2014 03:44 PM, Ed wrote: > Yah, it is weird. All axis resist movement in the positive > direction strongly and the amp faults easily in the > negative. If I apply pressure very slowly in the negative > it will resist somewhat but a rapid movement will fault it. When you say fault, you mean the red LED on the servo amp lights up? That means the power input to the amp is detecting over 20 Amps. That should not be happening.
The enable signal to the servo amps requires that there be a connection between the motor power supply minus and the 12 V supply minus. This should be done at ONE POINT only, otherwise the large motor currents can cause ground loops that interfere with the various control signals. >> You might want to check your wiring for any difference >> from the sample schematic. > Two of us have checked the schematic to diagram then physically followed > wires and compared to the Hardinge that is running. > > >> Also, what are you using for a 12 V >> power supply for the UPC and servo amps? > It is an old XT or PC supply that checks out at 12.06 Volts. It may not be stable with no load on the 5 V and a fairly small load on the 12 V, as it was designed to run disk drives that drew an amp or more. Often, there was actually no regulation on the 12 V either, and it could fluctuate quite a bit. > Your .ini file looks like it may be quite old, I note a ver 1.6 in it, and I see PWM_OUTPUT_SCALE = 3.33 If this is even used (it would be called up in the univpwm_motion.hal file with something like : setp ppmc.0.pwm.00.scale [AXIS_0]PWM_OUTPUT_SCALE This is a divider, and only lets you use a third of the full PWM output range. Newer univpwm_motion.hal files only use OUTPUT_SCALE. The PWM_OUTPUT_SCALE was a workaround for a bug in the very early EMC2 program that caused this parameter to be zeroed when the ini file was written out. What version of LinuxCNC are you using? What are the serial numbers of the UPC board and the servo amps? Jon ------------------------------------------------------------------------------ Rapidly troubleshoot problems before they affect your business. Most IT organizations don't have a clear picture of how application performance affects their revenue. With AppDynamics, you get 100% visibility into your Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro! http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
