Will 400V, 50hz, 3phase, 3A, 1.5KW motor run safely on 440V, 60hz power

I don't think you'll have any problems either, certainly not for 5 minute test. During that time you can check the motor & any controls such as a motor starter for early signs of overheating which would give you ample warning in this case. One thing that hasn't been mentioned, though, would be incandescent lamps & DC electronic components because they'd receive 20% higher voltage than normal which may exceed their rating & shorten lamp life slightly. Check on that before powering it up.
 
Thank you all for the help. I checked the voltage and it reads 441. The voltage comes from a transformer that is suppose to output 440. A 20 minute test did not show any heat or power problems. You are correct the spindle does turn faster. I will be machining 1/4 steel , 1/2 brass, and aluminum. I will be drilling and boring 1/2 steel. So I will not be taxing the system very much.
Thanks again for the help, you can take the rest of the day off.
 
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