- Joined Oct 3, 2010
You might find use for speeds higher than 60Hz. When I put a VFD on my lathe I decided to omit the mechanical gearing (belt change pulleys). It had a 1HP single phase motor which I replaced with a 2HP 3 phase motor, and I geared (belted) it for a permanent low-mid range. To achieve the higher speeds that it used to be capable of, I exceed 60Hz.That's probably why I didn't think it was common. Since all I want or need is 60Hz that's all I've ever set one for.