AC motor as generator holding torque

[Jacc]

Hello
I have a link here to a thread in the Fluid Power forum which is really more electrical.

https://www.eng-tips.com/viewthread.cfm?qid=446610

As I understand it a closed circuit hydraulic system powered by a AC motor is used to raise and lower a bridge.
When lowering the bridge the closed circuit hydraulic system works in reverse and feed power back to the AC motor.
Will the AC motor automatically take the role of a generator and feed the energy back to grid while also providing a controlled speed (run in synch)?

 

[ScottyUK]

Reply posted in the original thread - suggest we confine the discussion to one thread as it will become rather disjointed in two separate threads.