ok good those have the Reset filter capacitor added.The Kflop has version 1.3 silkscreened on it and I purchased it July of 2019. I also have another k flop that is at least 2 years old with the same silk screen.
ThanksThe Kflop software is 4.34.
I'm not sure I agree. No shielding and no earth grounding isn't ideal. You might verify the stepper motor frame is isolated from the coils and then try earth grounding it away from KFLOP. The Motor power supply wiring can be a noise source also.I have a hard time seeing anything but the stepper setup causing the problem because if the Stepper DC bus is disconnected the problem goes away. Both servos running will run for hours. The stepper system is so compact and there is nothing there but SnapAmp, Kflop motor and 2 feet of motor wire that is no where near any other wiring. No feedback wiring, no shielding, No grounding. It seems that there is no external path to generate a reset so it must be coming from within the boards.
All the resets are connected together but that may not matter for high frequency noise. KFLOP has a 1000pF ceramic capacitor C37 near JP4 placed in a manner that the Resets from JP4, JP5, and JP7 should pass through.If I install a filter cap on one of the ribbon cable connectors RESET lines, would this same capacitance / filtering be "seen" on all the other reset lines to the other connectors or would I have to install a filter at each connector??
Good ideas.I will also try running it without the 50 pin breakout. As you can see in the sketch, the only connectors on the K flop are to the Konnect and the SnapAmps. I'm going to completely remove one of the SnapAmps to see what happens if I run one SnapAmp with the stepper.
That would point to something being different here. Grounding, Supplies, 5V?I ran a system with two steppers on a Snap Amp about 6 years ago and never saw this problem.