Re: Converting from American Voltage220v 60hz to Romanian 230v50hz


"ravindavid" <ravindavid@xxxxxxxxx> wrote in message
news:1138645366.142016.111010@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> I have moved my American (and Taiwanese)machinery to Romania. My main
> concern is a 220v, 60hz, 5 hp machine with an accessory 60 v motor
> being run on 230v, 50hz. Reduced performance, unless substantial, is
> not a problem. Burning up machinery is. Another machine, of much higher
> quality, had the cycles changed from 60 to 50 by using weaker springs
> on the armature at the back of the motor. They supplied the springs and
> cautioned I not use the machine for more than 15 minutes continuously
> or I might heat up and overload the motor as it is now reading 276
> volts. I'm a carpenter, not an electrical engineer. I don't have a clue
> of how that works; I just did what the engineer said. Can you help?
> Thanks, Dave
>

The ideal solution is probably a PWM based motor speed controller. You can
sometimes get them fairly cheaply on eBay or surplus. However, for 5 HP,
most of them require 3 phase input so they don't need huge capacitors for
the DC link. V/F drives are also very good for adjusting speed, and they
have built-in overload protection and other nice features. However, they are
also mostly three phase output, and I don't think they like single phase
loads.

Paul


.

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