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This one has me puzzled, maybe someone can help?

I am setting up a new laser engraver, using GRBL, Arduino UNO and CNC shield. The shield has a double Y using cloned A driver.

I had all the...

Yes thanks, I have it working fine now.

Thanks for your input, yes I have checked the reference voltage.
The reference voltage is being produced with a LM358 board that produces 0-10 volts from the 5V PWM signal. It is working fine...

Thanks for the reply.
I have the stop/start working OK, I am using a PC217 opto isolator circuit to do the switching for that part. connected as you say between XGND and FOR.

If I set P00.01 =0...

I have a YL620-A VFD and an air cooled 1.5kW 220 volt spindle.
I am able to make it run successfully and control the speed from the controller pot on the VFD panel.
I am using Estlcam software...

Thanks for the detailed information. I has stopped me from wasting my money also, I was just about to purchase from YOOCNC¡ª¡ª¾*¼àÐÍ΢СÊý¿Øµñ¿Ì»ú¹©Ó¦ÉÌ directly, but after reading, no way.