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Third party software and hardware support forums. / Jittery noisy out of control steppers

« on: March 08, 2007, 10:14:27 PM »

I am trying to bench run an FET-4 kit from Stepperworld. I start the the software (Mach-2 or 3) then turn on the power supply to the FET-4 and the motors seem to run erratically even with out an NC file loaded. Aren't they supposed to make a nice smooth hum when they run?

If I cycle the power to the FET-4 sometimes they don't always run. Why are they not quiet and in control?

Thanks,
Rob