Issue with Z endstop sensor

I'm using a capacitive sensor for my endstop on my ramps 1.4 board it's set to the Z min pins however when my bed heats up and the nozzle the wires for the switch heat up and start to melt the wires.. anyone know the reason why??

Just guessing here... not a lot to go on

because you plugged a 12v sensor into a 5v digital circuit without any way to reduce the signal down to 5v?

Definitely sounds like a wiring issue.

Let's start with the obvious;
How did you wire up the capacitive sensor?
What kind of sensor did you use? (part number?)
Did you follow a guide to wire it up? (got a link of the guide?)

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http://www.marinusdebeer.nl/

This is the kit I got

[www.amazon.com]

I emailed them (but later found out myself) the wire inputs the board in the black box is the optoisolator with the terminals one for the 12V in and the 3 wires to the sensor... in order for me to work it on the ramps board I just had to flip the wires around.. Anyways I have the Yellow as sense and the black and red for the trigger the 12V for it is connected to my Mosfet board for the DC in.. I'm not sure why but the wire only heats up when the bed is heating.

That's very strange maybe it's pushing 12v through the ground somehow? I assume the black box has two resistors or a diode to deal with keeping the 12v separate from the electronics because they are meant to run on 5v.

Edited 1 time(s). Last edit at 05/06/2019 06:54PM by Ohmarinus.

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http://www.marinusdebeer.nl/

Yeah it does have a resistor and diode.. very odd.. it's working now I did have to replace a large section of wire however

It's still problematic because I don't think a sensor like that should pull so many amps that it melts a wire. I hope it doesn't happen again.

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http://www.marinusdebeer.nl/