we had 2 motion cars nearly burn down a building due to braking units not shutting off

the building did a emergency generator early in the morning, when they switched over to the generator, all seemed well, they went about there testing, and about 20 minutes later, the fire alarm in the machine room went off, then both cars shut down, the braking resistors got so hot that they started the wiring in the controller and the gutter on fire, it was quite the mess, well after quite a few days of rewiring and replacing parts the car were up and running, the problem was that the generator output was to high, over 525 volts, this high voltage turned on the braking units, which started heating the resistors, until they erupted in fire, luckily the engineers were able to turn off the disconnects before more damage happened I'm with christy, we never realized this could happen, it had no thermal protection. there are plenty units out there that will do the same thing kind of scary if you think about it it was a giant toaster. this is something to keep an eye out for on older breaking units