The precise details can vary, depending upon the inverter in use and how it is configured to operate, so there is no single generic circuit. The manual for your inverter should give the information required, though it may take a bit of digging around to find.

You'll almost certainly have to change a setting to tell the inverter to use a remote potentiometer for speed control.

If somebody offers a circuit diagram – first check that that your inverter is (or can be) configured to suit.

Don't get disheartened though – there are a limited number of variations on a theme, and most of the work will be matching control terminals of your inverter to those from whatever example you choose to follow.

Hi Peter

Not sure where i got the wiring diagramme from but this is quite good when used in conjunction with your instruction manual for your inverter.

Which VFD did you buy Peter? Each manufacturer has it's own method of connecting the controls so knowing that will help but basically there are two common methods of wiring the run command.

2-wire uses maintained contacts which simply means you turn the motor on and off with a switch, just like a light.

3-wire uses momentary contacts for the run command. Which is a little more complicated but more conventional in terms of how lathes were started with their original contactors using the red and green buttons.

I'm currently using the 3-wire method to build a control box for my South Bend lathe using a Yaskawa drive.

Browsing these might help with general ideas, but VFDs are not standardised.**LINK**

IDS stock a large range of the necessary switches, contactors, pots etc.

Edited By Clive Brown 1 on 20/11/2019 19:49:38