Hi,
Pc with win 10 64bit
this machine cannot be parallel port with that PC.
There are two schools of thought about electromagnetic interference:
1) The electrical equipment must minimise both conducted and radiated interference to other equipment
2) Electrical equipment should be designed and built to be minimally susceptible to conducted and radiated electromagnetic interference.
You may have noted that just about every piece of electrical gear has markings to signifying that the manufacturer has minimised the interference
produced by the piece of gear. This often entails untold expense by the manufacturer both in design and compliance. Then what happens is people
often and sometimes deliberately misuse or modify the gear so that it 'pollutes' the electromagnetic spectrum. Sometimes, especially cheap manufacturers,
cheat and their gear will never comply with the standard indicated.
VFDs are bastards at EM interference both conducted and radiated. Most people overlook conducted interference, it occurs because the current demand
of a piece of gear, a VFD for instance, causes a voltage imprint on the supply of other gear and interferes with its operation. A VFD can radiate interference
as well like a bad radio station. Screened cables, ferrite suppressors and things of that nature help other gear to resist bad radio waves but the real solution
is to stop the bad radio waves from being generated in the first place.
In the first instance you need to separate the supply to your PC/Bob/controller/stepper drives from your VFD supply with separate plugs plugged into
separate sockets. That may be enuf. Other than that you may need line reactors. You can fiddle about with screened cables and ferrites and you might
get it to work OR you go to the source of the problem as I've described.
Craig