Capacitive proximity switches

[bkrzic]

Hi!

I'm planing to upgrade my old laser machine with x7 controller. I have in my machine omron proximity switches tl-q5mc1 for home position which I'd like to keep. They have three wires. 24v, gnd and signal. When sometimg metalic is over the sensor it outputs 0V at black wire, and when it is not sensing anything it outputs 24V. I need to connect gnd and elx- pin to signal dsp that it is in home position. Here is the problem... Are elx, ely or elz inputs TTL logic (5V) or can they be connected to 24V in "not active" state that I get from sensor? There is nothing in available documentation that would clarify that for me. Do I really need to short gnd pin and elx- pin at x/y limits connector to signal machine that it is in home position or just getting a logic 0 from somewhere else is enough?

Thanks,
Boris

[Techgraphix]

Normaly Proximitysensors (NPN types!) have an opencollector output.. There can be a pullup-resistor but it is save to connect the black wire to the logic levels.
see:

BTW it's not a capacitive sensor but an inductive type..

Kees

[bkrzic]

So you say I can just connect black wire to EX- or other AWC inputs and it will work? If that is the case - great

Thank you!

[Techgraphix]

And connect the blue wire to GND, and connect the brown wire to +24V ofcourse..
It works in all my machines so why not in yours...

BTW These proxy's do work fine at +5V as well, although the recommended work voltage is 6-36V

Kees

[bkrzic]

I've connected them. Everything works, except Z-table. AWC completely ignores it, but it's extra slow so no problem

[Techgraphix]

See if the Z is connected to the right entry (Z- or Z+)
I remember that I had something the same with the Z, but with all that Positives and Negatives in the menu's you will easily get lost..
You have to get the keydirection right and the motor has to travel correct and then there are some limitsensors that have to be connected to the right entry..

BTW Both my Z-proxy's sit there useless.. I really never use them.. But I do have a autofocus-proximity-sensor just aside the nozzle.. I use that everytime..

Kees

[Tech_Marco]

To enable Z table on X7, press ESC and Stop key to gain access to the menu to enable the Z.
Just select Open on Auto reset on the Z axis

I am trying to get the programmer to enable it through LaserCad.

Marco