If you ask me, it would be OK. Motor is slower, but everything is ok and there is enough of ventilation.What if that motor was wired D400 and running at 20Hz?
Could also sound like a 87Hz setup where the motor was mistakenly connected in Y instead of delta....
Thought about that one also, but motor is 400/660 not 230/400 and drive output is 3x400V.
A few things to think about on this
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Star is 2 winding in series to a center point each winding is still 400v
2 400v windings in series “ Star” would be a phase to phase line voltage of 800v
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A few things to think about on this
The voltages don’t sound right 400V Delta / 600V Star
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It would be 400 Delta, 690 Star. 400 x 1.732 = 692...
The other older voltage rating was 380/660V, but that has been superseded. People still get confused...