I’m having an issue with a VFD that I’m not seeing when I search all forums. I’ve got a 480V, 3 phase 15hp pit pump that is controlled by a Leeson speed master drive, 25hp capacity. Power is applied through an Allen Bradly starter station with hand/off/auto selector. This pump used to have a float switch and would run automatically, but the environment is too corrosive and would corrode the switch. We’ve been running the starter in hand the last few months, and turning the speed down to about 40hz. A little overflow is of no issue. About a month ago, we had some water get into the starter station and shorted out the starter itself. I replaced it and the overloads and checked everything, everything looked normal. Started the pump and it ran fine for a few minutes and then tripped the overloads on the starter. Ohmed the motor and leads, everything checked good. Started it again, same thing. Amped all 3 phases and I got 11, 0, and 21 amps. Decided to replace the pump and the same thing happened. Replaced the wiring from drive to the pump, same result. Just out of curiosity I took the drive out of the system and everything worked great, same 11 amps on all 3 phases, so we replaced the drive with the exact same type, and problem returned, 0 amps on one of the phases with the overloads tripping on the starter. Any suggestions would be great. I basically only have a clamp on multi meter and hand tools