Have been having alarm 166 (Y return margin too small) error upon zeroing all axis on startup. I have replaced the mechanical Y axis limit switch to no avail. I checked the switch connections for tightness as well as the servo-motor connectors. I have had this problem before and cleaned the limit switch and it solved the problem but not this time. I also checked the arm that contacts the switch to trigger it and it appeared tight and not bent or damaged. Waiting on my HFO to respond but I though I throw this out on the forum to see if anyone has encountered this problem and found the solution. Thanks in advance.
Robin