600
« on: August 25, 2020, 01:29:10 AM »
It’s not an exact science so there are differing opinions but here is my take…
All signal inputs (Estop, limit and home switches, probe, etc) should be connected with good quality shielded cables with the shield connected to a single point, ‘star’, Earth at the controller end only.
There should be no ‘Earth loops’ or ‘GND loops’ anywhere in the system wiring.
The VFD inverter should, if possible, be located away from any input wiring or un-shielded electronic circuitry.
The cable between the inverter and the spindle should be shielded with the shield connected to Earth at one end only.
The VFD should ideally have an RFI filter fitted in series with its mains input.
The VFD manufacturer’s instructions regarding earthing / grounding (assuming they are supplied) should be followed.
Stepper and power wires do not need to be shielded unless there are special circumstances.
The last ½ inch or so of un-shielded cable is seldom a problem and should not be of any concern.
Tweakie.