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I had to put a lead to the router bit to the -v of the powersupply to get the probe to work. Similar to the e-stop.Originally Posted by henrikm
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I have searched and read, but haven't really found good pictures/diagrams of the BoB side of things.
I have hooked up position 4 on the G540 to a slab of aluminum. I have also set the probe port and pin in Mach3 (port 1, pin 13, active low). I figured since my spindle is grounded I didn't need a clip to the bit but I can't seem to get the led in the diagnostics screen to light up. Tried running a wire from common ground to the bit, but still no cigar.
Do I need more connections than the one wire from the input on the G540 to the touch plate/bit?
I had to put a lead to the router bit to the -v of the powersupply to get the probe to work. Similar to the e-stop.
I'll try that. Thanks.
I took and placed a wire from v- to ground and that allowed the circuit to complete with the touch plate.
[url]Http://www.glenspeymillworks.com[/url] *Techno LC4896 - 2.2Kw Water Cooled Spindle | *Moving Table Mill from an Omis 3 CMM, 500Lb granite base, Hitachi router, Mach3
You're saying I should wire the common ground in my enclosure to VDC-? Isn't that going to f* things up?
If I can get around using the alligator clips that would be the best.
The green wire from the AC power cord and the V- from the power supply should be connected to the frame/enclosure at ONE PLACE. Usually, you put a stud at some nice place near where the AC cord comes into the enclosure, and make that the common ground point. But, yes, V- connects to frame ground.
I believe this is called a Star ground.
Thanks guys, really helpful. Electronics is not my strong side. My enclosure is plastic so I have made a central ground bus (orange connectors) where the 48v psu, vfd and homeswitch shields get their ground connection, and of course the 230v ground coming in at this point. I also have a bus for 48v-.
(pic attached.)
Just to make sure so I don't get the infamous magic smoke in my workshop. What I should do to make a proper ground, is pull a wire between my 48v- bus and the ground bus?
And if anyone have time I'd appreciate an explanation why this is. Why the 48v- has to go to ground. Just for curiosities sake.
Again, your help really is appreciated.
Any inputs on my last post? I really don't want to "just try". Thanks!
Yes
48- needs to go to ground because of the wireing in the g540 needs it to complete the circuit for the touch Plate. I had to ground my heatsink on the g540 as well.
[url]Http://www.glenspeymillworks.com[/url] *Techno LC4896 - 2.2Kw Water Cooled Spindle | *Moving Table Mill from an Omis 3 CMM, 500Lb granite base, Hitachi router, Mach3
Ya need two connections to get a circuit. The slab of aluminum has a wire to the input.
That's one connection.
The power for the Gecko is the 48 v supply, and you have it's ground and + (it's not really -, it's ground, 0V relative to +48). You need the input to go between 0 and 48 (actually less than 48). But zero relative to what? The answer is zero relative to the power supply ground. You want the tool tip to make the connection, so it has to be connected, somehow, to power supply ground.
Now, typically the tool is grounded to the frame through the motor. But frame ground is not power supply ground unless you make it so.
Typically, you connect power supply -, green wire ground from the power cord, and the actual frame, at one place (star ground) in your chassis/box. That makes frame ground the same as power supply ground, and completes the connection when the tool (at frame ground = power supply ground) touches the input.
Thanks allot guys! Will finish the wiring tomorrow!
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