[Al_The_Man]

Yeah, I know its wrong, I guess a good quality switching power strip with a filter and surge suppressor is worth using for my bench test stand (and the VFD). I did fry a sdga 750 watt drive once from not paying attention and wiring neutral to ground. Poof.

As someone who has been in the business of CNC retro-fits including supplien VFD's of all makes for over 40yrs, I have never used a filter on the input, I recently attended a seminar by the area electrical service company regarding power factor correction and they touched on the fact that power factor savings is the only benefit in the use of VFD filters as they normally posses a very large capacitor bank on thier input that acts as a filter. also confirmed in the installation sheet by Mitsubishi.
As to power disconnection, As an enclosure builder, I am obliged to conform to CEC,NEC,NFPA79 regulations concerning Emergency stop circuitry, A class 2 E-stop can be applied where the imediate stop of equipment is dangerous to either equipemnt or personnel.
Class 2 allows for the stopping of the VFD before power removal.
All responsible VFD manufacturers would obviously design and conform for the eventuallity of any of these E-stops.
In the 40yrs or so, I have never had a failure from the industrial customers I have served.
The VFD's I have mainly used were Mitsubishi, Telemecanique, Group Schnieder, Allen-Bradley, WEG etc.
All of these manuf. have a support group that one can work with in the eventuallity of unusual installations.
I did contact Huanyang for some engineering information and was deeply un-impressed, the info provided was amateurish, to say the least, and many questions could not be answered.
The bottom line I guess, is you get what you pay for.