My probe is acting up on my jackpot board. It gets a very faint light when the probe makes contact with the router bit, but enough to throw an error. Proper probe contact is still a full bright LED.
I’ve checked wiring and can’t find any obvious issues. Does this need a resistor to clean up the signal?
Not sure I understand. Those 2 statements seem contradictory. What error is it throwing? That it’s not making contact within the specified distance? A picture of your probe and how it’s attached to the bit/router would be helpful.
Sorry. To be clearer, when I clamp the probe crocodile clip to the router bit is when I see a faint Light on the probe LED on the jackpot board. Touching the actual probe itself / making the full circuit gives full LED.
Error - Probe fail Probe fail. Probe is not in the expected initial state before starting probe cycle
So it won’t start the probe cycle, ie, nothing moves.
Is it possible that you have the leads reversed, and there is a partial circuit to ground through the router?
I’ve swapped the pins, and it has the same behaviour
It does feel like a bad connection or bad earth, but I can’t seem to find it
So the probe touchplate itself isn’t touching anything?
Correct
You’ve got a medium resistance sneak path to ground through the router bit.
Power down the machine, bust out a DMM, and measure the resistance between the router bit and the VMOT return (Jackpot power supply negative) black on the PS -, red on the router bit.
What’s the resistance?
Flip the DMM leads, repeat. What’s the resistance then?
The only way for the led to light is with voltage. When the probe isn’t touching to complete the circuit there is no way for that to happen, unless you have some minor contact between the 2 points. Since it only happens when the probe is connected, you have a mechanical issue somewhere in the probe wiring.
Not necessarily. There can be a sneak path to a return through the router. That’s why the request above to make some DMM measurements.
Correct i dont have to connect to ground for my probe to work i just connect to the aluminum tape and the router bit probes and no ground cliped to it to send flying. Now im not sure why this is so or if it is safe but for this purpose it works great for me but it is something with the spindle.
Oooh, I could turn the bug into a feature- I like it!
You note the probe LED is illuminated dim until it touches… I wonder what you get if you flip the two-pin cconnector on the jackpot. Does it work as expected then?
Sorry not OP just interjected i dont have a jackpot on that machine. Still courious about the reason. Posabley all using the same ground through power strip?
Same test. Flip the leads on the controller- stay on the same two pins in the header, just opposite wires on the connector.
1 Like