Let me just clarify one thing here about my installation.......
I'm running a 1.1kw 3 phase motor via an Invertek 1.5kw inverter.
There is nothing between the output of the inverter and the motor, this is directly wired with 2.5mm2 tri-rated wire....run in conduit.
On the input side, I used the existing wiring that fed the run winding of the original motor. This supply goes via the nvr switch, as did the start wiring( subsequently removed..)
The nvr is interlocked with the chuck guard( although I'm not actually using it, the wiring has been removed) and the pulley cover atop of the machine.
Normal Stop-Start of the mill is taken care of via the Fwd-O-Rev switch that sits along side the speed control pot. These inputs are wired to the control terminals on the inverter.
In the event of a supply interruption, the machine power is cut, in the event of an emergency the power is also cut, this is the job of the nvr switch....it is hard wired and is not subject to the software of the programmable inverter, this is in line with standard industry practise...
So, there you have it...hopefully clear and simple....