I want to ask why charging from 5okw generator with 7kw motor can be used but not with 11kw motor.

The rated current of a 50 kW generator (three phase) is approximately 73 A and the rated operating current of an 11 kW three phase motor is approximately 22 A. Generally, the starting current at vacuum of a three-phase motor is about 4 to 5 times the rated operating current, that is to say, the starting current of an 11 kilowatt motor can reach 80 ~ 100 A, which is well above beyond capacity. of a 50 kW generator, which is directly reflected in the output. The voltage drops so low that the contactor cannot remain in operating condition. The rated operating current of a 7 kW motor is about 14 A, and 4 times the starting current is 56 A. Even if it is calculated at 5 times, it is only 70 A, which is well within the rated range that the generator can handle. If you must use an 11 kW motor, it is recommended to start with reduced pressure.