all the above info was great but still does not answer the original question. There are 2 motor/pump combinations, both worked fine but now one keeps tripping off on its thermal overload while the other does not. One draws 13 amps and the other only 8 amps.
light load is letting the pump discharge water overboard with only 5psi back pressure, heavier load is shutting discharge valve to bring pressure up to 20 psi.
this motor is on a small ship with its own Generator. There is an exact duplicate of this motor/pump set and the other one works fine. The gen. voltage is constant.
I have a 5hp ac motor. It trips off on thermal overload at light load but runs at a heavier load. At light load it draws 14 amps at a heavier load only draws 8 amps. Anyone know the cause?
