Hi all,
I am have an issue with a CNC machine I built and can't workout why..
Problem is when I turn on the spindle (just a 3 phase 400hz motor) I get random limit switch activations, sometimes after a few seconds and sometimes after a few minutes. If I leave the motor off, everything works fine.
Question is as the limit switches a active low (pulled up via 10k) how is noise affecting the switches? If the where active high I would understand, but been active low the noise would need to be negative. Is this possible?
I am going to change the pull up resistors to 1k to try to fix the issue. Besides this, is there anything else I could try to fix the issue?
Thanks.
I am have an issue with a CNC machine I built and can't workout why..
Problem is when I turn on the spindle (just a 3 phase 400hz motor) I get random limit switch activations, sometimes after a few seconds and sometimes after a few minutes. If I leave the motor off, everything works fine.
Question is as the limit switches a active low (pulled up via 10k) how is noise affecting the switches? If the where active high I would understand, but been active low the noise would need to be negative. Is this possible?
I am going to change the pull up resistors to 1k to try to fix the issue. Besides this, is there anything else I could try to fix the issue?
Thanks.