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Nick
I have got mine working, seems the g540 is not toast after all.
What I found .
VFD outputs 10v to pin 9 on the g540
G540 pin 7 is ground
So you would think to measure the voltage...

Nick
Found this video that explains the setup ok
https://youtu.be/GoiXZt9_cxc
I think my gecko540 is toast on pin 9 as no matter what I do I cannot get any variation in voltage from that pin.

Nick
I'm having the same issue that I'm after help with
I have the huanyang1.5kw VFD with water cooled spindle that I have just upgraded to.
I have the spindle starting up ok via a relay from...