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5hp motor from 4hp inverter. Possible?

I occasionally see references to people running a three-phase motor from a single-to-three-phase inverter that has a lower nominal horsepower the motor, and 'derating' the motor accordingly. So does that mean I could get, say, a 5hp machine and run it from a 4hp inverter, so long as I didn't expect more than 4hp from the motor? Or will it just fry the inverter?

Supplementary: I hear some 3ph-3ph inverters will shut down if you run them from 1ph with one of the legs missing. Anyone know if a 3ph Mitsubishi A200 will put up with single phase running or will it just shut down?

-Neil F.

Reply to
neil f
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Yes

No

Don't know. My last (only) experience of this sort of abuse was with a "Lucky Goldstar" (now LG) 3 phase invertor that I used on single phase to supply 50Hz to a computer whilst doing performance tests in a Power station in South korea, in 1985 (the 8" floppy disk drives had synchronous motors). That invertor worked perfectly for two weeks, then died. A Lucky Goldstar engineer came to see the remains and swore at me in fluent american english! He told me that I was stupid to expect it to work on single phase, I said that they didn't make single phase invertors. he repaired the invertor and we later ran it from a three phase supply via a three phase Variac to give us the right voltage.

Mark Rand

Reply to
Mark Rand

A Mitsubishi A024 with a three phase 240 in/ three phase 240 out will run off a single phase 240 in. It ends up being derated by 2/3. Whether the 3 phase 400 in/out versions do the same I don't know!

Charles

Reply to
Charles Ping

BTW, Mitsubishi manuals are available online if you need to look - they do make reference to single phase supply in some manuals.:

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Charles

Reply to
Charles Ping

Thanks for the info folks. Turns out the Mitsubishi unit in question is an FR-A240 3.7kW 380-415v model. Anyone ever got one of this series to talk to single phase?

Reply to
neil f

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