motor voltage question

Do you have 220v single phase that you can run 15 horsepower on, or 20 HP for good measure, accounting for derating a 3 phase unit to run on single phase? A look around the Hitachi website might do you to some good info. I was reading through a couple of their VFD manuals there recently, and they are pretty complete, and easy to read.

Gods, only the dogs would be able to hear the power meter spinning, it'd be going so fast. :-)

Cheers Trevor Jones

Many VFDs, such as the 15 and 25 HP VFDs that I am selling, are capable of reducing input voltage.

i

Trevor, Yes I have the capacity to run 20HP. But only single phase. I already have a 25HP VFD that should handle it fine, it has been running a 10HP for awhile now with no probs.

I guess the main thing I am worried about is the funny voltage range. Usually on the motors I have seen or had, the voltage lists something like 208-440 or something like that. This particular pump has been up for auction since April or so, and that is also why I am wondering if it is some oddball deal. ron

190-380 sounds like European voltage to me, check to be sure it's 60 cycle. It might be 50.

Thank You, Randy

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Ah-ha! Randy, you win the PRIZE!

I got a pic of the nameplate on the motor and sure enough it is 50 hz.

Now what?? Sounds like an auction to stay away from! I have a WEG

25HP VFD, I will have to contact them to see what my options are, unless someone here can enlighten me also?

thanks!!! ron

AFAIK 50 cycle motors will run fine on 60 cycle power, though proportionally faster.

The 50 cycle motors use a bit heavier windings and laminations in them.

Running a 60 cycle motor on 50 cycle power apparently can result in heat issues, though some motors will deal with it well enough.

Cheers Trevor Jones

Uhhh... Ron?

V F D

Variable Frequency Drive, yes?

Run it so the output is at 50 Htz.

:-)

Cheers Trevor Jones

Normally, a 50 Hz motor will run on 60 Hz just fine, running even cooler than normal. The voltage range sounds like maybe it was part of an assembly that needed variable airflow control and it was controlled by voltage instead of a damper assembly. Just a wild guess on my part. Not sure how a 50 Hz motor will run on a VFD designed for 60 Hz, though. Best get hold of technical support for that case.

Stan

Why? 50 Hz at 190 volts does the same magnetization of the stator as

60 Hz at (190 x 60/50) = 228 V ; sounds like the motor is a standard 60 Hz design that has been relabeled for use on the other side of the pond...

As long as the thermal protection and insulation are suitably (over)rated, just use it.

If it was labeled 60hz and you wanted to run it on 50, there might be a problem, as it may saturate too much at lower frequency and run hot. Going to higher frequency GENERALLY is not a problem, as long as the speed is not critical.

At a lower freq. you would have to drop the voltage proportionately, resulting in less HP output.

John