VEVOR 220V 3KW VFD Variable Frequency Drive CNC VFD Motor Drive Inverter Converter for CNC Router Milling Machine Spindle Motor Speed Control (3KW VFD)

It is suitable. You need to ensure that the motor must be three-phase 220v. That is, the voltage of your motor must be 220 volts. You cannot add a switch between the inverter and the motor. You need to use an external port to control  the startting and stopping of the motor. The external start application method is as follows: pn04=2 pn07=2 The hardware connection is described as follows: FWD and GND connect forward, disconnect to stop REV and GND connected to reverse transmission, disconnected to stop FWD and REV are connected to GND at the same time, reverse transmission, all disconnected stop

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No, a switch cannot be installed between the inverter and the motor. But you can lead your switch signal to the control terminal of the frequency converter, which is the forward and reverse signal, and input it into the frequency converter. The frequency converter will allow your motor to realize forward and reverse rotation. Because the output of the frequency converter can only power the machine, not any other power supply on your equipment.

This is caused by a switch between the inverter and the motor. The simplest description is that you are using the inverter as a power supply, which is not allowed. Just connect the switch on your equipment to start and stop, and the frequency converter will control it.