- Joined
- Jun 12, 2014
- Messages
- 4,847
Suit yourself on the VFD, there are also a lot of things that you may not know about the HY VFD's. For everyone that works there is one that doesn't or people run into programming/function issues. A 3Hp VFD should be on a 30A breaker, so 10AWG input 230VAC. Motor cable is 14G, 3 conductors and a ground. Technically it should be 600V rated or higher due ti the PWM voltage delivered, the motor rated voltage is RMS not peak voltage. You can pick up various small amounts of wire on eBay, also Automation Direct has very good pricing. I do not know anything about your lathe, so how you are going to hookup the VFD and wire it in is unclear. They are not a 3 phase power source to the lathe, the motor is wired directly to the VFD. It is not good practice to wire the spindle switches directly to the VFD low voltage control circuits, and if there is a foot brake it needs to put the VFD into a freerun mode when operated and not restart the lathe when released. HY comes in many variations, I installed one many years ago on a lathe, it had terminals for an external braking resistor but no circuitry inside to operate it. I never used another one since. RIP. Neutral wire you can split out 120VAC circuits but it needs to be on a separate 15A breaker.