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Never mind. I just thought of a different way.
I can just use one of the spare contacts on the contactors to run the 5vdc from the ESS E-stop.
Amazing what a bit of sleep will do.

Hi all.
I'm in the process of wiring up the electrical cabinet on my cnc mill conversion and have got as far as the E-stop.
My question is simple but needs to be explained to make sense.

I have...

Ok... after reading every ones posts and spending a couple more days researching, I was able to wrap my head around the ciruitry and connections so I decided to get a relay BoB. I bought the C41s...

Thanks mactec54. I thought that might be the case. I've got components to build a BOB and will get onto that asap.
Any thoughts on the common/ground issue?

Well as the title suggests I'm trying to achieve speed control for the spindle through Mach4.

I'm using a Teco VFD part number is something like JNEV-202-H1. Operators manual can be found here......