I can't get my 5 horse horizontal spindle to start in the higher speeds... It trips the 30 amp circuit breaker ahead of my RPC. If anybody remembers, I asked about this issue a week ago, adding capacitors and larger idlers lets it start in lower gears,but I'm not there yet. It uses very little power once up to speed.
I looked at a VFD. The way the control panel is wired, it would be hard to install. There is a rotary switch that flips two leads for reversing rotation ahead of a motor contactor. Estop logic can drop this contactor. There's start/stop pushbuttons on the operator panel for motor operation. All logic uses 110 VAC.
Iggy suggested a soft start. see this example: