Router has died. Need Advise Please.

[EddyCurrent]

Generally where there is high frequency you need screening, so that means from PC to bob, bob to stepper drivers, stepper drivers to stepper motors, VFD to spindle motor.
I used CAT5 twisted pair for the bob to stepper drivers, CY cable for stepper drivers to stepper motors, CY cable from VFD to spindle motor. Some have said that CAT5 is not flexible enough to run through the energy chain but that depends on the bend radius you have and the type I'm using is stranded not single core.( CAT5 bend radius it's usually considered to be 4x the diameter). Failing that a different twisted pair flexible cable would do. I also used the same twisted cable for the limits as I bought a roll of it, it's the twisting that helps it reject noise.

It's a double edge sword, on one hand you are trying to prevent interference entering the cable and on the other hand you are trying to prevent interference escaping the cable. In general for the first issue screens have been connected at one end only and usually at the same point, hence the term star earthing. For the second issue screens are connected at both ends to meet the EMC regs. So with that in mind are your cables interference generators or receivers, I would say they are all generators except for the limits which are receivers. This implies screens are connected at both ends for everything other than the limit cables. At least then if you do suspect problems you can simply disconnect one end of the screens to see if it helps.

This is worth a read
http://www.nexans.co.uk/eservice/UK-...3_PBE_V2_1.pdf

Though aimed primarily at music applications this is also a wothwhile read.
http://www.phmusic.co.uk/pharri5833/oneend.htm