G203V's randomly faulting

[tiggeraaron]

Long time lurker, first post!
Some backgound:
I have a 3 axis system I put together that I am now in the process of testing before I put on my bridgeport. It is Mach 3 with a cnc4pc C11G BOB that is connected to 3 G203V gecko stepper drivers. The 3 steppers are 4 wire Nema 42 with 4.25V 8A ratings. The power supply feeding the G203Vs is 54VDC that is using a very large filter capacitor and toroid transformer rated at 700VA.
With all that out of the way. When I first powered on the system the Y axis driver would not come out of a fault condition. The X and Z axis was fine. After verifying the wiring and trying a different stepper on the drive and general fussing around, it finally powered on without fault. I then proceeded to jogging each axis around and decided to run a part program. I couldn't get all the way through the program without one of the axes faulting. Sometimes the X, sometimes the Y and sometimes the Z. I messed around with some velocities, steps per, pulse length, etc... etc... and have run out of ideas to try. Not sure what to do at this point, hoping that someone somewhere might have come across this or have some other ideas to try.
Thanks in advance!!
Aaron White

[mc-motorsports]

Try slowing down the velocity and maxinum speed? Are you losing steps before the drivers fault?

[tiggeraaron]

I don't think it is losing any steps, at least that I can tell. The motors run fairly smooth both at slow and fast velocities.

One other thing in case anyone is wondering. I did heatsink these drives and made sure that they were not faulting because of overtemperature.

Could it be that leaving the disable pin open is somehow causing the drive to go in disable mode? I know this is sometimes a problem in digital logic electronics. Maybe I should tie this to ground to make sure, thoughts?

[tiggeraaron]

Just an update on this topic for anyone following this thread. I conversed with Marcus at Geckodrive and will be sending the drive on the Y axis back becuase of the fault that won't clear.

For the X and Z, instead of running them at 7 amps, I placed some current setting resistors to run them at 6 amps. That cleared up the random faults on these axes and I was able to get all the way through a part program at a reasonably quick feedrate. When I get the Y axis drive back from Geckodrive I will report then on using all 3 at 6 amps.