Wiring a chinese tool presetter.

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

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Shorting the 24 volt to ground is considered "bad form":lol:
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

Hi
.......
Between your points 19x7-2 and 19x7-9
24VDC regardless whether the tool setter is depressed or happy.
......
BAD. You will never get a change on io. First there must be a change!!
Measure if 3a1-5 is on gnd level.

Do you have the same gauge as the original poster (Sliptonic?)
If so, then you need to power the sensor with 24V and then the yellow output wire will change state as the switch is pressed.

So, you need both the wiring you show (where the switch is yellow to ground) and the 24V + GND power supply for the sensor itself.

Hello Andy,
no mine is a bit different. You can see it and its schematic here.
It seems to be two separate circuits for the two switches.
Mark

If it is just two physical switches then I think you would just wire the switches between 24V and a 7i76(?) input pin.