Help please. Dip switches and mach 3 settings

[Radu_Andrei]

What I mean that all seems ok, is in comparison with the last state of the machine when the motors were going nuts and the limits were switching erratically.
The bob is not grounded by any individual cable. I assumed that via the usb cable, a ground is provided, which goes to the pc case, and then to the mains.
I did not measure the ground from the mains, but when I touch it, it gives a tingling sensation, like is has some voltage going through it. This is the mains earth as it comes into the property.

The bright side is that it.s all better than before, so I.m still happy, even if, righfully so, Clive disagrees with my so called ˇˇall okˇˇ opinion. I.ll rephrase that. All better than before.

[Clive S]

The bright side is that it.s all better than before, so I.m still happy, even if, righfully so, Clive disagrees with my so called ˇˇall okˇˇ opinion. I.ll rephrase that. All better than before.

Perhaps we have a difference in language. By "working OK" I meant that are the inputs now working as intended , ie if you connect one of the inputs to ground does this show that it is triggered in Mach3 ?

For the avoidance of doubt when we ask for a voltage measurement between an input and ground we mean between the input pin and -ve of the power supply (not earth star point).

Do you get the tingle sensation when you touch the star ground point.

[Radu_Andrei]

Hi Clive,
Yes, all 5 input pins are triggered in mach 3.
The measurement regarding 26v (right now is 24v) was taken between p13 and the gnd situated right next to p15.
Last week, when I connected the control box to the mains, I.ve cut power via the workshop fuse, and wired everything up, but the earth wire does not go through any breaker, switch, fuse etc, it.s go directly into the mains street pole.
On that particular time, it was raining outside, and when I touched the earth wire, it felt quite unpleasant. Touching it now for example, I do no feel anything. I.m taking about the yellow/green continuation as a single wire of the star ground point.

[Radu_Andrei]

P.S. measuring between -12v on the other side of the bob, and the p10 to 15, I get the same readings, measuring the +12 v and p10 to 15 I get 12v into all pins except p13 which has 16v.
Is this the -ve fro the power supply? the - pin of the dc12v?

[cropwell]

It seems that you may have a poor earthing of the mains supply. If you get any voltages on the earth from the pole, you may have a bad /corroded connection somewhere outside.

[Radu_Andrei]

I cannot fix anything out there. I can only disconnect the earth mains wire, and instead add an diy one, like drive an iron rod into the ground somewhere outside. Is this good enough?

[cropwell]

I cannot fix anything out there. I can only disconnect the earth mains wire, and instead add an diy one, like drive an iron rod into the ground somewhere outside. Is this good enough?

An iron rod will corrode quickly, earthing rods are brass or copper.
I don't know how things work in Romania, but in UK Electricity supply safety is taken seriously. I would ask a qualified electrician before doing anything.

[Clive S]

On that particular time, it was raining outside, and when I touched the earth wire, it felt quite unpleasant. Touching it now for example, I do no feel anything. I.m taking about the yellow/green continuation as a single wire of the star ground point.

I can't see a problem if you could drive an earth rod (copper) into the ground external to the property and connect that to the earth coming into the building.
https://www.tlc-direct.co.uk/Product...xoCHl0QAvD_BwE.

Glad to hear you have finally got it working.

[Radu_Andrei]

Ok. Will do. Thank you.

[john swift]

the earthing problem explains a lot

if your utility supplier will not fix the problem then
replacing the faulty earth connection with an earth spike
will convert your supply to a TT system and be safer than what you have now





John