01-23-2018, 06:00 PM
Coming into this discussion late but I'll add some more confusion. Why would you retain the lathes original contactor to turn the VFD on and off. From what I was led to believe switching the power to the VFD off when its under load is really hard on them.
I'd wire a disconnect ahead of the VFD then turn the motor on and off using the VFD. You can do this using the lathes start/stop buttons connected to the low voltage controls on the VFD, same with the forward reverse.
I recently wired my drill press this way using I think that same VFD from Automation Direct.
I didn't use a reverse switch, not needed on a drill press and didn't add the external pot, not needed with a 2 speed motor and 4 gears.
The tech I spoke with from Automation Direct was great, I wanted to retain the switch for the 2 speed motor after the VFD and he said no problem, IF you don't switch it when the motor is running, VFD input power on no problem.
I'm an electronics Neanderthal but worked my way through programming it using the manual.
I'd wire a disconnect ahead of the VFD then turn the motor on and off using the VFD. You can do this using the lathes start/stop buttons connected to the low voltage controls on the VFD, same with the forward reverse.
I recently wired my drill press this way using I think that same VFD from Automation Direct.
I didn't use a reverse switch, not needed on a drill press and didn't add the external pot, not needed with a 2 speed motor and 4 gears.
The tech I spoke with from Automation Direct was great, I wanted to retain the switch for the 2 speed motor after the VFD and he said no problem, IF you don't switch it when the motor is running, VFD input power on no problem.
I'm an electronics Neanderthal but worked my way through programming it using the manual.
Free advice is worth exactly what you payed for it.
Greg
Greg