Checking Limit Switches

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An assembled limit switch with cable for use in the Argentum printer.

BEFORE DOING ANYTHING ELSE, CHECK THAT YOUR SOFTWARE AND FIRMWARE IS UP TO DATE - CLICK HERE TO FIND OUT HOW

This page is a brief tutorial for testing your limit switches to make sure everything is working properly. Begin by ensuring that your USB cable is plugged into your Argentum and computer, you have the ArC control software downloaded & operational & your printer is switched off.

If you are having trouble getting your motor to physically click onto the limit switches, but the switches themselves are functional, see Troubleshooting.

  • Gently move the carriage of your printer to the centre of both the x & y axes by hand. You can also turn on your printer & use the arrow keys to move it in place before turning it off again.
  • In the ArC terminal (first make sure you are connected), type 'c' and click Send. The printer will now be trying to move it's carriage to calibrate but the stepper motors are unpowered. The ArC terminal should print something similar to this:
    • +Calibrating.
    • +No switches are initially triggered.
    • +Resolved nothing, finding X
  • If your printer does not show "+No switches are initially triggered." then one of your limit switches is either not plugged in or faulty.
  • Using your finger, press on the X-MAX limit switch (the one on the right). The ArC terminal should print something similar to this:
    • +Limits: X+
    • +X axis, a motor, + direction, CW motor (+CW STD)
    • +Y axis, b motor, + direction, CW motor (+CW STD)
  • If this does not occur, your X-MAX switch may be faulty.
  • Now press the Y-MAX (you'll have to put your hand into the left side at the back but the switch can be pressed easily without removing any panels). Your terminal should show:
    • +Limits: Y+
    • +X axis, a motor, + direction, CW motor (+CW STD)
    • +Y axis, b motor, + direction, CW motor (+CW STD)
    • +Homing
  • If this does not occur, your Y-MAX switch may be faulty.
  • Now press the X-MIN (the one on the left). Your terminal should show:
    • +x-
  • If this does not occur, your X-MIN switch may be faulty.
  • Now press the Y-MIN (you'll have to put your hand into the right side at the front but the switch can be pressed easily without removing any panels). Your terminal should show:
    • +y-
  • If this does not occur, your Y-MIN switch may be faulty.

If you believe a switch is faulty through performing the above test:

  • Unplug the limit switch from the control board at the back.
  • Use a multimeter in continuity mode (or resistance mode) to verify that the switch is shorted across the pins (the switch is closed normally & open when the switch is depressed). This can be done easily by touching your probes to the exposed crimp sections as shown here:
LimitPlug.jpg
  • Now press the switch while still measuring continuity across the terminals, they should form an open circuit. If the connections remain shorted when you press the switch in - you may have a defective limit switch - please contact support here.
  • If your switches pass this test, plug them all back in, & run the above manual test again, if it still fails - contact support here.