true true, this is a slippery slope, how hot does it have to be to shut down, to hot, to late not hot enough and nuisance shut downs. i have noticed that most of the drives now have the dynamic braking circuit included in the drive. i wonder if this same scenario would still turn the output on? ac line volt to high, causing dc bus volt to climb beyond braking voltage and the continue to cook the resistors. anyone have any ideas on the new drive circuitry.