My thoughts on nvr....
A true no volt release switch assembly should be wired in the primary side .....As it says, if power is lost, it releases....no auto restarts, no surprises...
My experience with inverters/vfd's.....most I've come across, Imo, Teco,(jaguar is just a model...) Invertek etc....all require a maintained input not fleeting for external switching.....stop/start and fwd/rev switches should be mutually exclusive....that is one state or the other.....