Hi guys,
I receiving the error messagge below, when I open "Ports & Pins" and when I turn on the spindle with M3.

I use XP and the USB SmoothStepper.
To VFD I have the C32 (rev4.2) of the CNC4PC.

Can someone help me to solve this problem.

PS. When happen I need to Kill Mach3 with Task Manager, and disconnect the usb from PC.

Motors produce a lot of electrical noise, motors with VFDs produce a whole lot of electrical noise. What is happening is that the noise from your VFD is killing the USB communication. First make sure everything is Earth grounded properly and that no high voltage cables (VFD, stepper motors, etc) are near the USB cable. Use as short of a USB cable as you can.

Thanks for your replay,
Could you explain more about Earth ground :"First make sure everything is Earth grounded properly".
In post a photo of my wiring.
I have to connect the usb GND's to the Earth contact?

This thread should help:
http://www.machsupport.com/forum/index.php/topic,22751.10.html

RICH

i took a look at your image i recognized that you conected the y axis 2 drives parallel  i researched that before before buying the c32

you need to connect the second Y axis motor to another axis port in case of a 3 axis machine connect it to the 4th axis and from the mach3 settings
verify that axis as a slave to the Y axis you'll need to order an extra c34 for that