PMDX-126 and touch plate

[groc426]

Hello everyone,

I've been attempting to setup a touch plate (http://www.themakersguide.com/home/products/triple-edge-finder-2) to the PMDX-126 but so far have been unsuccessful.  I actually had it working great about a year ago, but due to some other issues I had to disassemble my controller box and apparently I have forgotten how to set it back up.

For this setup I've grounded my Huanyang 2.2KW spindle, which is of course ran to my VFD, and finally I run a ground wire from my VFD to the ground (earth) inside my controller box.  On the PMDX-126 I've wired the signal cable for the touch plate into J12, "15".  So my question is, do I need to wire anything to the GND on the PMDX-126?  Should I wire something from GND (the one referenced next to "15") on the PMDX-126 to the ground (earth) that I took the VFD ground to?  I've attached a simple, crude drawing to this thread in hopes that it will show what I've poorly explained. 

Mach 3 Ports & Pins->Input Signals:
Enabled: Green Check
Port#: 1
Pin Number: 15
Active Low: Green Check

Any help is greatly appreciated!

[Steve Stallings]

Your setup looks like the classic "touch plate" one.

The touch plate's active surface connects to an input, typically pin 15.

The underside of the touch plate must be insulated from the work
or machine table.

The ground wire from the PMDX-126 must come from one of the GND
terminals on J11 or J12 of the PMDX-126. It should have a clip that
can be attached to the cutting tool during probing. Trying to rely on
grounding to the spindle can result in flaky operation.