USB error and iPad mobile cart.

I have a 15 inch MacBook Pro managing a iPad mobile cart of 30 iPads. When I plug the USB cord with all the iPads hooked up to it into my Mac an error message comes up saying my USB ports are drawing too much power and that they will be turned off temporarily. This doesn't make any sense because the iPads have their one power supply. I unplug my Mac and restart it and about five minutes later the error message comes up again when there isn't anything connected to the USB ports and its been sitting on my desk untouched. What might be happening?

I would seek support from the maker of the cart. Few visitors to this forum are likely to have experience with such a device.

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