Summary: From solving problems to analyzing upgrade opportunities, you can do a lot by reading a motor nameplate.

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Motors come in different shapes, sizes and ratings. But every motor has one thing in common — a nameplate that helps you analyze, optimize and economize performance.

The voltage is the electrical input required by the motor. Multiple voltages may be specified, but the motor's operation will be less than optimal when voltage drops or exceeds rated voltage by more than 10%. Amps is the amount of current drawn from the line during normal operation at rated voltage, speed and horsepower output.

Fullload efficiency (F.L. EFF.) reflects the power output divided by the power input at full load. Knowing volts, amps and efficiency, you can estimate motor energy consumption. The fullload speed, listed as RPM, is the measure of the motor's actual speed at the rated horsepower output.

Locked rotor amps (LR AMPS) tells you the current draw when the motor is energized with full voltage, but not rotating. Comparing this number to the AMPs rating will determine the potential surge severity during startups or jams.

The service factor (S.F.) signifies the maximum percentage increase above the rated output at which the motor can operate for a limited period of time. Just remember that going above the rated output can degrade life expectancy.

The insulation class indicates the ambient temperature range the motor can handle. A higher letter designation represents a higher temperature allowed or a longer life expectancy at a lower temperature.

Solve problems, analyze upgrade opportunities and estimate energy consumption — all with the help of your motor nameplate.

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