I had finished connecting up my cooler last night and did the first version of my interlock circuit between the pump flow switch and the vfd. The circuit worked fine so I decided to run the pump and check it all out properly. So connected up the 110V supply to the relay and turned the pump on. The pump ran great for about 5 seconds then burnt out! I cant see any reason for it so it looks like I just have a bad one. I need to get this repaired before I can get anything else done.

Ian