2 speed pump trips breaker

[BigDave]

Electrical theory and the trade practice of Electricians are different and often not mutually understood. Power Systems Engineers should understand that unbalanced loads and neutral faults and opens (in the customer premises as well as the mains and distribution networks) can cause unexpected voltages on neutral and lines. Neutral should be connected to Ground at the service entrance panel so voltage on the power company neutral could be seen on the Ground line.

I'd want to know what the line to line and line to ground voltages are on this circuit with the control system disconnected.

Bottom line - something's wrong. A good Electrician with pool experience should be able to help.

[Watermom]

I'm going to ask Poconos to take a look at this thread for you.