jerjwillelec
Senior Member
- Location
- Nevada, IA
I have a 12 year old three phase motor for a water pump at a local swimming pool. The nameplate is pretty corroded but I can read at 230 volts it pulls 51.3 amp so I'm guessing it to be about a 20 HP motor. There are two exact motors side by side pumping water into the same line to a slide. One of the motors has recently started tripping the overloads on the contactor. It will run just fine for 3 to 6 minutes and then the overlods trip. Both motors are pulling the same load within an amp or so. I turned the solid state overload setting up to 80 (as a test) and it still trips though it maxes out at 56 amp while it's running. I've never seen solid state overloads 'go bad' but I guess anything is possible. Any thoughts?