BRIAN GLACKIN wrote: > John, > > I am certainly no expert and defer to your expertise. I did not mean to > imply that the motor lost steps, but meant it never received the step since > it was consumed powering up the driver. If this is so, then that drive has a massive design defect, and the idle current reduction feature is hopelessly flawed, as it will lose steps somewhat unpredictably with practically every CNC software out there. How can the CNC program know when the drive has powered down, so it can issue an extra "wake up" step? The old Gecko drives has a one-shot that would set the drive back to full current within microseconds of the leading edge of the step pulse.
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