Jay, I heard you couldn't get that inverter till Jun or Jul because of the imported parts backlog from China
Hey Richard,You're totally right about square wave AC motor drives, they work really well. The big difference is, as you mentioned, is "high frequency".Truth is, even pure sine inverters are square wave inverters at heart. But as opposed to simply making a square wave (or modified one) at 60 hz, pure sine inverters AND the big motor controllers create square waves at very high frequencies, usually 50khz up to sometimes even into the megahertz range, and then those frequencies are pulse width (or similar) modulated so that their energy content is a 60 hz sine wave; the high frequency portion is then filtered out either by LC elements in an inverter or in the case of your big AC motors, by their inherent inductance, and the final result is that the load (motor etc that needs to see a pure sine wave) actually does see a pure sine wave at 60hz, even though the reality is that the sine wave is actually being created by high frequency square waves. Make any sense?Heck, it's all in the smoke. Keep the stuff inside the wires and anything goes... let it out however it happens, and stuff quits working....
Sean, I have 2- 2012 stacked and I posted they were modified sine replacing them with 1 new Magnum pure sine when Dick can get it for me