After many years of fussing with YL620-A settings (and trying to keep track of what I've changed) I took the time to build a spreadsheet with all the settings. I've set it up as a Google Sheet with comment access to everyone. Feel free to make personal copies, but I'd appreciate comments and clarifications.

My Machine is a heavily modified Chinese 6040 (YL620-A, plate steel bed, upgraded spindle, Gecko G540, UCCNC controller and software). I'm in the US, so power is 60Hz 120VAC.

Columns B&C are sort of correct after a tedious attempt to extract text from various PDF versions of the manual.

The 'Factory Settings' column contains the actual factory values (after reset) of the unit I now have.
The 'Last Value' column contains values that worked until some minor change caused the VFD to go into 'Er 4' every time I tried to power up the spindle.
'Trial Value' is what I'm currently using.

Cells that differ from the factory values are highlighted in yellow.

Here's a screenshot teaser followed by a link to the spreadsheet. Please let me know if you have and problem accessing it.

Attachment 510494
https://docs.google.com/spreadsheets...it?usp=sharing