[moonsafari]

I have a Bridgeport Mill that keeps tripping its breaker. The transformer on the machine takes in 240 V and outputs 120 V for the mills spindle motor. The voltage across the two inputs of the transformer is 234 V and the voltage across the two outputs is 120 V.

I then checked the voltage across the inputs and outputs:

138 V across input 1 and output 1

76 V across input 2 and output 2

112 V across input 2 and output 1

198 V across input 2 and output 2

I don't know anything about electronics, does this seem right?

[moonsafari]

Here are some pictures of the electrical box components, hopefully they might help

https://imgur.com/vbC1hvr
https://imgur.com/az0u1Ic
https://imgur.com/KyZVAwT
https://imgur.com/OmDeRkG
https://imgur.com/YOyfD4F
https://imgur.com/RKUw5qc

[Jim Dawson]

The mill motor runs on 230V, 3 phase. Input to the transformer would be 230V and output would be 115V. You would not measure across the input to the output.

Has this mill been running or is this a new install?