For the most basic single-speed PSC motor, the usual designations for connections are C, S & R. Full-load current is correctly measured on the common lead. [You should also see the same reading you clipped around the S & R leads simultaneously.] Rated FLC should be listed on the equipment label, and not be exceeded at all after starting. If it’s high, check for correct line voltage on the C & R leads. If it’s normal, the next thing to check is excess mechanical load. Often, appliance-grade fractional-horsepower “39-frame” PSC motors are furnished with sleeve bearings, so if any significant shaft sideplay is evident, plan on replacing the motor for the bearings are rarely economically replaceable.
