Hi,
When someone says that your power is 220, 50Hz, they are referring to one
power leg measured to nuetral. In the US that voltage is 120. In Europe, it
is 220. With 3 phase power, you have 3 power lines, each being 120 degrees
out of phase from each other. So, when measuring the voltage Phase to Phase,
you have 208 in the US and 380 in Europe. In the US industrial areas where 3
Phase power is available, it is possible to obtain 208 and 440 commonly and
other higher voltages upon request like 880. The same is also possible in
Europe in industrial areas. The power in India is modelled after Europe
(UK). So, in summation, if you have 220, 50 Hz, you also have 380/400 3
Phase power. Now, in the US, most 208, 3 Phase motors are also 440. They are
changed by simply rearranging the 12 wires within the motor.

It is clear you are confused. There is no such thing as 220, 3phase power
anywhere. In the states it is 208, 440 or 880 measured phase to phase. In
India, it is 380/400, 660/740 and higher. No changes need to be performed
other than wiring them internally for 440. Upon arrival, apply 380/400 and
they will work fine.
Steve

wrote in message
ups.com...
Hi steve..
Thanks for the prompt advice.i'll be checking out with the manufacturer
for the concerns..but in my case it would just be a change from 60hz
to 50hz with the operating voltage remaining the same i.e. 220v
i would be installing these in india.Where the supply is 220v,50hz.
i would also be using similar kind of motors.(15,10 hp).Do think
overheating will not be significant in my case.