AndyUK's Build - 1.2x1.0m Gantry

[Doddy]

Hi All,

Wiring Diagram, V1 attached!

Questions I'm currently pondering:

• Theres currently no ground to the UB1, and by extension anything that it connects to, other than cable shielding. I feel like I should be grounding the motor drivers or something...!
• Does the E-Stop circuit look okay?
• Need to find Limit and Home switches and then tailor diagram to their requirements.
• Need to figure out what I'm doing with the 4th pin on the spindle re grounding. Does the ground go to the VFD like I've shown?

Thanks Nick, I've been using a few of your diagrams on here and CNC Zone :)

1) Why? you're driving the stepper drivers through their own opto isolation - no need for common ground there, and I *think* the analogue output from the UB1 for spindle speed control is also an isolated supply. Don't worry about galvanic shielding - the UB1/UC300 isn't shielded so you're gaining nothing.
2) Let someone else answer
3) Let you answer
4) Should ideally go to a common/star earth point, similar to the VFD earth (and the supply lead earth)

Not familiar with the UB1 - can it drive the 24V contractor coil directly?, and back emf?