Originally Posted by
mflux_gamblej
There are three small fuses (0.5 A, 1.0 A, 2.0 A) on the large terminal block in the power supply cabinet (right hand side cabinet). The 0.5 A fuse was blown. I replaced that, and not to my surprise, this didn't solve the issue.
There isn't any power (expected 120V) being supplied to the heidenhain 151 B. The controller's fuses are all OK.
I found more fuses in the power cabinet (right hand side cabinet) on the transformer 'T1.' These are all 10 A fuses. They're all intact.
At the moment I am suspicious of 'Overload 3,' which is in the supply cabinet. The output voltage is ~ 1 volt on each of the three rails.
I don't seem to be able to operate the overload though. The red 'test' tab doesn't do anything, and the blue 'reset' button doesn't really do anything either. I've pressed both of these buttons with the power applied to the machine.
Does anyone have experience with overloads failing? This is a Klockner-Moeller EZ00 overload (the 200-6 model with 4 to 6 amps selectable) Is there a fuse inside the overload?