Wiring a chinese tool presetter.

It's the inverse of what PCW said. Yellow grounded to green normlly but opens when tripped.

Wiring into a 7i77.

Yes. The red goes to +24 when fully pressed.

Awesome. Thank you, Andy.
I connected it with an or2 with my touch probe. I also connected the 'machine protect' connection with an or2 to the Zmin limit switch as rodw suggested.

Seems to be working perfect. Now I just need to figure out my workflow for setting tool length offsets and touching off.

Thanks guys.

I thought I'd add in an attachment that has some specs... This one is a Shina and can be purchased on Amazon (from which I downloaded the attachment). I suspect all of the different brands are made in the same factory; either that, or one is original and the others are all clones. Both concepts seem to be the Chinese manufacturing/marketing paradigm, so it is kind of hard to tell.

[edit: hmmm, your one has fewer wires, and mine definitely has an LED, so apparently the units are different... Have you gotten the software part of the preset working? I'm curious how the whole 'insert a new tool, go and preset it so you verify you have the right tool in' part gets added to LinuxCNC and works]

Anyhow, here you go....

you can also red the Parameter VAR out and give it a Go for the Rest towards the Setter
as a G91 move

BEST practice for me in Education here is to get a TOOL with given Max length 100.00mm here RIM 10mm it is exactly the 100 +- 0,01mm
tool number 100 this is the tool that never changend the holder
WE set this to Cordinate system P6 G59 as the Tool ZERO point
then you simply call G59 Tx M6 (with Hx length set to Zero)
touch down
and enter the Different to 100 to the Tool table
THIS can be automatet as G10 L1 Px Z[100-#5323]
use a ngc to make all this to your need
Button that calls this ngc

I asked this on my MAHO thread, but it didn't get noticed. Is this the correct wiring for the tool length sensor?



When I check it with HALShow, the attached 7i77 pin stays high, even when the button is pushed. I would appreciate some suggestions in trouble shooting this.
Mark

3 easy questions
What show measurement betwee your points 19x7-2 and 19x7-9
Is your 7i72 field connected to 203 gnd
What happens on io pin of 7i72
Mike

Mark
I think Mike E has made some good suggestions .
Only thing I can think of is to temporary replace the Tool Setter with a clip lead to get it out of the equation.
Really like the idea of using a volt meter to measure voltage between 3A1-5 and 7i72 s 24volt ground return at the Bd.
Is this the same 24 volt that powers the Exe Board ?
What is the maximum input voltage and amp for a 7i72 Board input?
Try measuring voltage across the 2K ohm resistor using a clip lead to simulate the disconnected Tool Setters Normally Closed contact.
Check for same but opposite results at the 7i72 Bd terminals.
Hope you are only missing a ground connection

---

Shorting the 24 volt to ground is considered "bad form"
Bob

Thanks for your help troubleshooting this Bob and Mike.

Is your 7i72 field connected to 203 gnd?
Good pick up. No. The MAHO has two 24VDC circuits. One is always powered and the other dropped by the E-Stop. I have the 7i77 on the always powered circuit between 204 (+24VDC) and 201 (GND). So I have now changed my tool setter ground from 203, to 201 (well actually to a vacant PE terminal connected to 201, as I had no 201 terminals free. Bad practice?



Ignore the red circle around the relay. I recycled this image from another discusion. I retested it after changing the ground, but still get no joy. hm2-5i25.0.7i77.0.0.input-10 remains high whether I depress the tool setter or not.

Between your points 19x7-2 and 19x7-9
24VDC regardless whether the tool setter is depressed or happy.

What happens on io pin of 7i72
Do you mean what does the HALShow of hm2-5i25.0.7i77.0.0.input-10 indicate? Always high.

Only thing I can think of is to temporary replace the Tool Setter with a clip lead to get it out of the equation.
Did that. Even with the tool setter removed (Open circuit between 3A1-2 and 3A1-5, the HALshow shows the pin high.

Is this the same 24 volt that powers the Exe Board ?
Yes, TB2-3 is one of the 7i77's Field power connections, so I am taking the same power as the board.

Shorting the 24 volt to ground is considered "bad form.
Thanks Bob, what would be the correct way to do it?

What is the maximum input voltage and amp for a 7i72 Board input?
From the MESA 7i77 manual...
48 points of isolated field I/O are provided for general control use including limit
switch, control panel inputs, coolant enable and tool changer control outputs. Isolated I/O
includes 32 sinking inputs and 16 sourcing outputs. Inputs can sense 5V to 32V signals
and the outputs can switch 5V through 28V signals. Maximum output load is 300 mA.
Outputs are short circuit protected. Field I/O is powered by an isolated 10-32V field power
source.

Try measuring voltage across the 2K ohm resistor using a clip lead to simulate the disconnected Tool Setters Normally Closed contact.
Differcult. I heat shrinked the node with the 2k2 resister and it's branches, and the connector is some mil spec pin insertion DSub which a work colleagues dead Dad borrowed from his French military Tank factory a couple of decades ago. The connector is well insulated from prying multimeters....
... but for Bob, we can abuse it till we get an exposed wire to probe. I measure 2.4VDC across the resister.
Mark