Earthing?

[Robin Hewitt]

But now I have to do it properly using 4 core screened CY cable, 1.5mm2.

Why is that "properly"? I like big fat wires, as big as will fit in the screw terminals on the driver. I run my big fat wires through flexi-plastic conduit to keep it tidy.

Why would you want screened? Armoured would be more understandable.

If you are worried about interfering with your high speed computer connections, you could screen those perhaps.

[Edward]

Robin, now you are confusing me:)

As far as I understand, "armoured" hardly offers any electromagnetic containment. All signal cables will be screened. I will use flexi conduit for the motor wires too. Do you mean you run 8 separate fat wires inside the conduit?

Edward

[Clive S]

Robin, now you are confusing me:)

As far as I understand, "armoured" hardly offers any electromagnetic containment. All signal cables will be screened. I will use flexi conduit for the motor wires too. Do you mean you run 8 separate fat wires inside the conduit?

Edward

Edward just do as you suggested chop the wires off about 250mm from the motor and then join them to the CY cable personally for the motors you are using I would go with 1mm size. If you want to be posh you can get an end cover for the motors and take the cy cable into that.

[Edward]

Thanks Clive.

The 3.1Nm motor would draw a maximum of 4.2A, but we all know that in reality it's probably about half of that anyway.

So a cable of 1mm2 (normally rated for at least 10A) will more than cover this. However, I wonder if there is any benefit in using a thicker cable, other than robustness...or obsession:)


I like the motor covers with the glands. Is this something you printed yourself, or are they readily available for the Nema23 frame? BTW, my Z motor is to the side of the column, just like in your picture.

Edward

[Clive S]

Thanks Clive.

The 3.1Nm motor would draw a maximum of 4.2A, but we all know that in reality it's probably about half of that anyway.

So a cable of 1mm2 (normally rated for at least 10A) will more than cover this. However, I wonder if there is any benefit in using a thicker cable, other than robustness...or obsession:)


I like the motor covers with the glands. Is this something you printed yourself, or are they readily available for the Nema23 frame? BTW, my Z motor is to the side of the column, just like in your picture.

Edward

I printed these a few years ago but since then I have milled them from various blocks of plastic including those fencing posts made from car tires. If you do a search for hem I have seen them in Europe somewhere

https://www.hardware-cnc.nl/en/winke...nema-23-detail

http://www.thingiverse.com/thing:243126

[Robin Hewitt]

I wonder if there is any benefit in using a thicker cable, other than robustness...or obsession:)

Now't wrong with a bit of healthy obsession

Thin cable is fine and dandy if you were lighting a bulb or charging your iPhone with a bit of AC but this cable has more to do than that.

On the other end of it is a hefty inductive load, it may have tuned itself a bit to reduce the peak but sooner or later it is going to want to reverse the current in a coil winding PDQ. It will try to control that current using a chopper circuit which depends on measuring the current flowing some way away. Did you fit the optional braking resistors?

Fat, low resistance cable takes the strain off more expensive components.

[Edward]

I don't have braking resistors.

Here is a pic of my conversion, the Sieg SX2.7 with the drivers, etc waiting to go in a suitable box.

Edward

[JAZZCNC]

Now't wrong with a bit of healthy obsession

Thin cable is fine and dandy if you were lighting a bulb or charging your iPhone with a bit of AC but this cable has more to do than that.

On the other end of it is a hefty inductive load, it may have tuned itself a bit to reduce the peak but sooner or later it is going to want to reverse the current in a coil winding PDQ. It will try to control that current using a chopper circuit which depends on measuring the current flowing some way away. Did you fit the optional braking resistors?

Fat, low resistance cable takes the strain off more expensive components.

Robin your talking shite again and confusing people with your ridiculous answers.!. . . If your not going to help people with relavant or helpful replys then why don't you STFU.!!

[Robin Hewitt]

Robin your talking shite again and confusing people with your ridiculous answers.!.

Hi Dean

I knew you would be along to explain why everyone seems hell bent on screening and tin boxes despite the problems they cause. This is something that has bothered me for some time, a trap I think I have fallen in to myself.

Ready when you are, I am all ears...

Robin

[Clive S]

Did you fit the optional braking resistors?

Robin would you please explain how to fix a braking resistor to the motor in this case