N.K. didn’t mention the circuit frequency for the looms. The frequency in UK is 50 Hz—in France it’s 331/3 Hz. These parameters were adapted in the channel tunnel projects a few years back. At one time, there were other variations in power sources in Europe. Perhaps they still exist.
The proposed solution is technically reasonable, but without details of the 380V, 3-phase system, it’s difficult to be sure. We once had a situation requiring application for 50 Hz in our 60 Hz arrangement. Our solution was to use a standard 60 Hz generator running at reduced speed to provide 50 Hz power. It worked. Perhaps N.K. could apply a similar solution to his situation. —B.B.B.