I know it's been 4 years but I found this thread after I initially searched for the answers, and in case anyone is still wondering (I doubt many people would be), but I found the way it's done using Console Commands; with no need to completely redo the park. If you click on the Robot using the console and type "resurrect" they will spring back to life. It will try to tell you "Mr. Frothy is not unconscious" but that doesn't matter. If it says that they ARE unconscious then you're stuffed. I was unable to revive them from that point. The ones i found were supposedly unconscious were the Spacewalk Turrets, Turrets in Vault-Tec, Mr. Handies in Vault-Tec, and one single Commander Gutsy in Nuka-Galaxy. Other than that they were all fine. Sometimes I found the Mr. Frothys would go back down after being resurrected, but I just opened the console and resurrected them again, and they worked fine. Idk if anybody else will find this useful, but I hope it helps someone :)
