Just a quick question about hooking up a G540 to a harbor-freight mill that has been CNC'ed.
On the geko there is
pos 7 -X- VFD Ground
pos 8 -X- VFD Output
pos 9 -X- VFD +10v
Inside the spindle on the mill there is a DC motor controler it connects to the existing controls that are just a variable resistor to set speed they are
Red Wire -X- Vin sets speed [more volts the faster it turns]
White wire -X- +10V
Black wire -X- Gnd
The catch is on the mill Gnd is about 50V above Ground everywhere else so measuring from black wire to Ground gives me about 50V and red gives about 60V. This seams to be common on DC motor controlers with a resistor for current scene.
In the papers for the geko it calls the VFD output a opto-isolated output is this just from the computer or is it from the rest of the geko. I'm hoping its from the rest of the geko then floating it at 50v will be no problem if it is just from the computer then I need a analogue opto-isloator.
Thanks Tesla^3
ps Thanks to geko for a Excellent little stepper driver my mill is running about 3x faster then my previous home brewed steprep drives![]()