Lets Talk Wiring And EMI
05 Jun 2019 00:05 - 05 Jun 2019 00:21 #135885
by rodw
Replied by rodw on topic Lets Talk Wiring And EMI
Well if its to be a sticky, here are some pics.
My star ground is a donated brass relic. I think I'd modify a brass buss bar if I was not donated this. Make sure its ground back for good electrical connection to the table.
This shows ground wires to Z axis stage and floating mount. This is the only place I shared a ground wire as I figured for 50mm, it would be fine and made for a neater install. You can see there is a thick cable bolted between the brass and the table hanging down. This would be your cable to the earth stake if you need it.
In the following photos ground wires are black with a red crimped on lug.
I have not run an earth wire from this to the control box as its secured to the table via several bolts and is there adequately earthed already.
Y axis ground wire one on each motor (yeh, I know Nema 34 is too big Tommy but I upgraded because I found a cool prebuilt 5:1 reduction pinion drive)
Z axis motor ground
So you can see this is not very hard to do.
I use a cheap wireless keyboard and mouse which seems to work reliably but with a 7i76e, I'm only connected via ethernet..
My star ground is a donated brass relic. I think I'd modify a brass buss bar if I was not donated this. Make sure its ground back for good electrical connection to the table.
This shows ground wires to Z axis stage and floating mount. This is the only place I shared a ground wire as I figured for 50mm, it would be fine and made for a neater install. You can see there is a thick cable bolted between the brass and the table hanging down. This would be your cable to the earth stake if you need it.
In the following photos ground wires are black with a red crimped on lug.
I have not run an earth wire from this to the control box as its secured to the table via several bolts and is there adequately earthed already.
Y axis ground wire one on each motor (yeh, I know Nema 34 is too big Tommy but I upgraded because I found a cool prebuilt 5:1 reduction pinion drive)
Z axis motor ground
So you can see this is not very hard to do.
I use a cheap wireless keyboard and mouse which seems to work reliably but with a 7i76e, I'm only connected via ethernet..
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05 Jun 2019 00:18 #135887
by rodw
Replied by rodw on topic Lets Talk Wiring And EMI
I thought something like this might make a good starground point. Throw the ends away and drill out the bolt hole and bolt it to the table via that hole
Cheap as chips
www.jaycar.com.au/16-way-100a-brass-distribution-bar/p/SZ2004
Cheap as chips
www.jaycar.com.au/16-way-100a-brass-distribution-bar/p/SZ2004
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05 Jun 2019 23:27 #135984
by tommylight
Replied by tommylight on topic Lets Talk Wiring And EMI
@Rod, those connectors I can find here in many, many versions! 
As for power supplies, I insist on using old laptop power bricks as much as I can, but lately I can not find much of them. They are very good, filtering is good, completely isolated, current limited (this becomes very important when something goes wrong), and firing 2 or 3 of them in series is easy as they are isolated ( be aware that some do have the grounding wired to the negative output terminal, so. It has to be disconnected, simply done by using a power cable with no ground contacts ).
FYI, avoid at all cost power supplies made by "horoz" , they have a picture of a chicken on them! No idea why. They tend to burn to a crisp on their own, burning the filtering coil on the output side. That is magnificently and undeniably done by someone with zero knowledge of electronics. As luck would have it, that was the only manufacturer found here for over a year! Now there are plenty of good ones.
As for power supplies, I insist on using old laptop power bricks as much as I can, but lately I can not find much of them. They are very good, filtering is good, completely isolated, current limited (this becomes very important when something goes wrong), and firing 2 or 3 of them in series is easy as they are isolated ( be aware that some do have the grounding wired to the negative output terminal, so. It has to be disconnected, simply done by using a power cable with no ground contacts ).
FYI, avoid at all cost power supplies made by "horoz" , they have a picture of a chicken on them! No idea why. They tend to burn to a crisp on their own, burning the filtering coil on the output side. That is magnificently and undeniably done by someone with zero knowledge of electronics. As luck would have it, that was the only manufacturer found here for over a year! Now there are plenty of good ones.
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06 Jun 2019 23:06 #136124
by tommylight
Replied by tommylight on topic Lets Talk Wiring And EMI
Burned a power supply ????
Was it a switch mode or a transformer/diode rectifier one?
All SMPS ones have short circuit protection and over current protection so they should never burn, except input voltage spikes and material fatigue .
I did test some Chinese 24V 6.5A ones I got lately ( got 5 of them ) and also modified it to have a much wider range of regulation and added an external pot so now it does 17 to 38V, could not push it above as I have a 7805 voltage regulator powering the voltage/amps display and I know it does not handle well 40V, did not want to see the magic smoke! . They did endure short circuit for prolonged time, hence me waisting time on the mod.
Did see the magic smoke today though, from an NVIDIA Quadro graphic card that has been in a drawer for the last two years so it gathered some moisture on the dust it had. Was disappointing though, just a miserable puff ! Main board is OK .
Was it a switch mode or a transformer/diode rectifier one?
All SMPS ones have short circuit protection and over current protection so they should never burn, except input voltage spikes and material fatigue .
I did test some Chinese 24V 6.5A ones I got lately ( got 5 of them ) and also modified it to have a much wider range of regulation and added an external pot so now it does 17 to 38V, could not push it above as I have a 7805 voltage regulator powering the voltage/amps display and I know it does not handle well 40V, did not want to see the magic smoke!
. They did endure short circuit for prolonged time, hence me waisting time on the mod.Did see the magic smoke today though, from an NVIDIA Quadro graphic card that has been in a drawer for the last two years so it gathered some moisture on the dust it had. Was disappointing though, just a miserable puff ! Main board is OK .
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