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FAQs / Re: shielded stepper motor cable or not?
« on: September 07, 2008, 11:42:42 AM »
Dave, I would defiantly use shielded cable if at all possible. The problem is on most Mach machines, there I/O is 5 volts. A slight bit of noise can bring a value high enough to be seen as high. 24V systema arent nearly as suspect to noise. 20% of 24 is 4.8 volts, 20% of 5 is 1 volt. Not a very big window. The big boys have this same problem as well, but they usually use something to isolate and convert the 5V to 24V for field wireing such as home switches and push buttons. This can be done as well in Mach and on the Hurco I'm working on that is how I will do it with Opto 22 racks. I will still shield everything though. Just too cheap an insurance policy to ignore.
Brett
Brett