The Volts per Hertz ratio must be observed.
The convert from 50 Hz to 60 Hz, multiply the 50 Hz voltage by 60/50.
Thus 400 Volts @ 50 Hertz will run on 480 Volt @ 60 Hertz.
460 Volt rated motors are almost universally supplied from 480 Volt/60Hz systems.
WARNING
The motor will draw the same rated current.
The motor will run 60/50 RPM faster.
The rated torque will be the same.
CAUTION; Centrifugal Pumps and Fans will draw quite a bit more current running faster.
You will probably need to throttle the discharge of both the pump and the fan when running on 60 Hertz.

--------------------
Ohm's law
Not just a good idea;
It's the LAW!

thank you !
a bit confused about the fan motor but will run them 60Hz and see what happens

"WARNING
The motor will draw the same rated current.
The motor will run 60/50 RPM faster.
The rated torque will be the same.
CAUTION; Centrifugal Pumps and Fans will draw quite a bit more current running faster.

You may drop the current draw on both centrifugal pumps and centrifugal fans by throttling the discharge.
The worst case that I have encountered was a poor design on a 60 HP dust collection system.
We cut a slot in the discharge duct and inserted a flat plate.
We had the discharge restricted a little over 50% before we got the current down to an acceptable level.
Setting up agricultural pumps it was common practice to install a valve in the discharge line.
The valve would be turned down until the current was acceptable and then the valve handle would be removed.

--------------------
Ohm's law
Not just a good idea;
It's the LAW!

thanks again