Hello guys. I got a weird set up (above pic) I only encounter 2 days ago. These are 2 unit 440V, 3 phase motor coupled to drive the same shaft, obviously in one direction with one motor actuated ahead by a delay timer seconds the other.
We got this equipment from a chinese manufaturer. Is this even a possible set up? I mean, to think this set-up is only quite possible if both motor poles are in complete synchronous phase with one another. Otherwise, the other motor cancels out the phase of the other at some point and can potential damage the utility provider.
I'd like to see what are your thoughts on this. Much thanks as always 
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