From a V/Hz standpoint, 480V 60Hz is the same as 400V 50Hz. But as mentioned, anything with a motor will run at 20% higher speed. On motors connected to centrifugal pumps or fans, the Affinity Law for motor speed means the pump or fan will require 172% more mechanical power, but the motor will only be delivering 120% mechanical power, so it will overload. What we don't know is whether or not any of this will be a problem for this equipment. Most likely there is a hydraulic pump in there so it will most likely be a Positive Displacement pump and not subject to the Affinity Law. But we have no idea.
A second issues is that of control systems. In foreign (to us) equipment like that, they often use L-N as a source of 230V control power. In a 480V 4 wire system here, the L-N voltage will be 277V, usually outside of the tolerance for anything with a coil. But if they have switch mode power supplies with auto-ranging input, it may not matter. Again, we have no way of knowing.
I love it when people buy equipment from EU sources without bothering to find out if it will even work here, then expect some poor unsuspecting electrician to "just get-er done". Easier said than done and by the time you get it all right, it would ahve likely been les expensive to use a North American resource for the equipment. Oh well...
