How about some pics of that modification?
From: Gene Heskett <[email protected]>
PIMA, but the electronics are good, no laggy opto's to distort a pwm
signal, and they give a rail to rail output, sourceing or sinking 24
milliamps. Opto's on the bob are a waste of protection with modern
stepper drivers as they all have their own optos for all inputs.
Properly driven, a 2M542 driver can exceed 350 kilohertz step rates. Put
an opto on the bob and it will often fall over, stalling the motor at
half that. One of them in series with a 10 kilohertz pwm signal and the
control linearity error over powers the PID's ability to keep the motor
within 20% of the requested speed. I found which one it was, pulled it
and bridged the 2 pins to bypass it, and now I get within 5% of the
requested speed without a lincurve module in the signal path, and the
PID handles that nicely.
FWIW Danny, I am a Certified Electronics Technician with at least 65
years of chasing electrons for a living. I may ask questions of these
kind people, but its generally a quest for the latest knowledge on
exotic subjects like the recent thread on glues, which you and Bruce
explained quite well. Thank you.
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