Cartessian U drive/endstop Homing Issues
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You need to use parameter P3 in the M584 command to hide the U axis most of the time, and use P4 to un-hide it only during Y homing.
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Thank you. I believe I understand the reference to the P3/P4 designation now. I originally thought it was simply to hide it from view of the DWC. Additionally, I have checked voltage across my endstop signal wire and the ground wire. I now realize I have 24 volts registering prior to it being triggered, and 0 voltage after being triggered. I have ordered bat43 diodes and plan to install them upon arrival. I am not sure if this is why I cannot trigger 2 endstops at once or not. Can you advise me in this area also???
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What type of endstops are they?
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Huling Inductive proximity NPN NO Model No. LJ12A3-4 Z/BX
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Without the diodes, there is a risk of damaging the Duet if you connect them directly and the ground wire breaks. That's the reason I recommend the diodes. Other than that risk, they should work if they are connected directly to the endstop input.
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Thank you.! They do work separately just fine. It is when I trigger them simultaneously that they do not work properly. I cannot leave either axis in its home position and then successfully home the other axis. The second axis will continue trying to move past the endstop. Can you please direct me on what to do next. I am at a loss???
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How have you connected the endstops to the Duet? The one for the motor that is always assigned to Z should be connected to the Z endstop input. The one for the motor that becomes the U axis during homing should be connected to the E0 endstop input.
Duet WiFi hardware designer and firmware engineer
Please do not ask me for Duet support via PM or email, use the forum
http://www.escher3d.com, https://miscsolutions.wordpress.com -
David, I currently have no endstops for Z only the bltouch. It appears to be working flawlessly as/for the Z endstop. It is configured to E6 on the Duex 5 expansion board and the Z-probe in and ground to the Duet wifi Z-probe connector. I updated my config files to eliminate the U-drive and posted the new config file recently. I am now trying to sort out the endstop issue, since it is the problem stopping me from homing the axis correctly. Once I have them homing correctly, I will follow your instructions and reestablish the U drive. The endstops are wired to their respective endstop inputs/drives and operate as they should when triggered separately. I have the positive and negative outputs wired to ssr's. The ssrs provide the endstops with 24 volts. The signal wire is wired back to the appropriate signal pin on the endstop plugs associated with the endstop/drive. I have tried to separate models of NPN NO endstops. Both models are operating in the same manner. They both have 24 volts across the positive and signal wires when not triggered. When they are triggered they show zero (0) voltage. If you like I can provide diagrams and photos.
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David, I apologize I do still have the Z endstops attached to the Z drive/endstop and the EI drive/endstop. I unplugged both the endstop for E1 and the endstop for Z. After doing that none of the endstops show up as triggered when activated in the DWC using M119. However the led on the endstop does light up and the led on the board light up. When I plug both of the configured Z endstops back in, everything goes back to as it was. I am able to only home each axis separately, and the bltouch works as it should.
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David I have now unplugged all 3 of the "currently" unused endstops. However, if I get the machine to home correctly, I would like to use E0, E1, Z endstops with the bltouch. However I could do away with the Z endstops completely. After powering the board back up and reconnecting the DWC. The DWC machine properties tab shows EO and E1 as hit (without doing anything) and x,y,z as no. I cannot get x and y to show a hit after they are triggered now that the others are unplugged. If I plug them back in they will show as a hit on the machine properties page and using the M119 command but only separately. Thoughts????
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David, Problem solved! I have found that the unused but still plugged in Z max endstop did have 24volts across the signal wire and the ground, but unfortunately they were inverted. The endstop ground was wired to the signal wire on the board and the endstop signal wire was wired to the ground. I have since swapped the wires and I am now able to home and trigger 2 endstops simultaneously. Thank you David for your assistance. I will continue on to the next step of setting up the printer.
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@vernon1xx said in Cartessian U drive/endstop Homing Issues:
I have found that the unused but still plugged in Z max endstop did have 24volts across the signal wire and the ground
Does the endstop LED on that input still work?
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David, luckily yes. The only questionable thing for my limited knowledge is that the EO and EI endstops show a yes in the DWC for an endstop hit. The other endstops say no. However, when I trigger the other endstops, they all show yes in the DWC machine properties tab. The lights on the endstop and the board light up when triggered as they should. Not sure why the DWC registers as yes for EO and E1?? Both of them light up appropriately as well. Any thoughts??
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David, I have found another forum member that has posted the table from the DWC and it shows the exact view I am seeing from the web page, machine properties. I will provide a link. https://forum.duet3d.com/topic/6261/cannot-understand-web-page-for-machine-properties
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Any endstops that are not configured for use with visible axes using M574 are assumed to be active high in the Machine Properties report. This means that they show as triggered when nothing is connected to them (LED off), and as not triggered if the outer 2 pins of the connector are shorted together (LED on).
