Re: VFD or Spindle problems
The way I solved my cable is too big issue. Set a dust proof / water tight J box with a cover of course on the moving part of the Z. Ran the good flexible shielded wire with ground to that J box. Grounded the shield and ground wire inside the box to the Z carriage and then ran perhaps a 6 inch flex cable to the that crappy to small connector, soldered the wires to the pins and bingo its done. I have a removable connector rated for the voltage. It passed the noise test using both my RF signal meter and my oscilloscope.
Do not use a microphone connector for high voltage power!! Or like mactec suggested, do away with the connector and just wire direct, that would work. Some spindles come with a "real" Junction box so you can do it fast and easy.
Retired Master Electrician, HVAC/R Commercial. FLA Saturn 2 4x4 CNC Router Mach4 Kimber 1911 45ACP