Re: G540 & VFD wiring ?
Originally Posted by
coils
I understand what an electric ground is, but the only thing marked as ground is 3 screws for the "line in" & "motor ground" at the bottom of the VFD where all the higher voltage action happens.
About half way up are the "control terminals" and none of those are marked as ground (on the drive itself or in the book).
That's why I'm mainly questioning the ground hookup, I couldn't understand if it was a Physical Earth ground (PE) or if it was some electronics special ground that used a different symbol other then a "-" (negative symbol).
See I told you I know very little about electronics
Now that confuses me too, I'm guessing the "pot" is a potentiometer (a knob you turn to adjust voltage, like a volume on a radio), but I thought that was built into Mach3 and electronically adjusted the voltage (or sends a signal to adjust it) through the pin which goes to these terminals on the G540 which tells the VFD what it should do?
And to add to your confusion, unfortunately the term Ground and the earth ground symbol has become misused to the point it is meaningless, especially in N.A. where the term for power common (ground) is also used for earth ground, as opposed to UK for e.g. where one is ground the other earth.
Here the Earth Ground symbol is often used for any P.S. common regardless of whether earth grounded or not.
Even one of the books quoted as being the Electronic Bible, 'The Art Of Electronics' uses the earth ground symbol throughout the book and does not even give any definition of such symbols.
Modbus is a very good way to control your VFD if you can configure your particular VFD, I am not sure whether there is a Mach generic pre-written Modbus plug-in apart from the one for the Huanyang VFD from China.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.