Smart effector led randomly trigger

[3dservice]

Hi everybody my smart effector started to act like this: when i start the printer, after the loading the led trigger randomly very often and when printer its mooving its permatriggered, i have 3x delta printers with 3x smart effectors, i tried other 2 smart effectors on this printer and work fine, so i'm assuming after a lot of unmount and mount to find out where is the problem to avoid rattling parts, that PCB its faulty, if someone can help me i would really appreciate, thanks.

[T3P3Tony]

@3dservice can you try changing the sensitivity of the smart effect to a les sensitive setting please:
https://duet3d.dozuki.com/Wiki/Smart_effector_and_carriage_adapters_for_delta_printer#Section_Programming_the_sensitivity

To program the sensor, send command M672 S105:aaa:bbb replacing aaa by the desired sensitivity and bbb by 255 - aaa. The green LED will flash 4 times if the command is accepted. When you subsequently power up the effector, the green LED will flash three times instead of twice to indicate that a custom sensitivity is being used.

So try

M672 S105:100:155

and if its still triggering when trying to probe then try

M672 S105:155:100

[dc42]

@3dservice said in Smart effector led randomly trigger:

Hi everybody my smart effector started to act like this: when i start the printer, after the loading the led trigger randomly very often and when printer its mooving its permatriggered, i have 3x delta printers with 3x smart effectors, i tried other 2 smart effectors on this printer and work fine, so i'm assuming after a lot of unmount and mount to find out where is the problem to avoid rattling parts, that PCB its faulty, if someone can help me i would really appreciate, thanks.

If the LED triggers during XY movement, that's normal and not a problem.

A common cause of the LED triggering when the machine is stationary is that a fan is creating a magnetic field that is inducing voltage in the sensor traces. The standard 30mm E3D hot end fan doesn't cause a problem, but some other fans do. Does the false triggering occur when the effector is stationary and the fans are off?

[3dservice]

Thanks everybody for the answers,

@T3P3Tony Sensitivity is not an issue, as i said earlier i have other effectors and with them the sensitivity its perfect, not triggering when machine is not mooving and olso is not when its mooving so settings must be pretty good, its triggering withouth a mounted fan, right now i have only PCB and hotend block without any other parts and still getting bad readings.

@dc42 actually i was tryng without a mounted fan, i have 3 machines that are built in the same way so they must act in all the same, i am testing this PCB without any fans mounted and when axis moove the led its permatriggered, instead with others effectors the led trigger only when he touch something, so yes its triggering as it is stationary and fans are not even mounted, i used this effector for like 5 months, and it worked well, then a day started with this issue i tried a lot of mount and unmount to find out if it was a physical problem of mooving parts but look like its not.

[T3P3Tony]

@3dservice I understand, just wanted you to try setting the sensitivity of this specific smart effector to less sensitive to see if that solved the issue.

Also please could you post a picture of the top and bottom of the board

[3dservice]

@T3P3Tony Sure, here some, if need more specific let me know

[T3P3Tony]

@3dservice please use this thread as authorisation for a warranty return.

[3dservice]

@T3P3Tony
Thank you a lot, got the new pcb faster then ever and its already printing

[T3P3Tony]

Thats good to hear, glad you are back up and running.