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Don't Forget the Grease!

Occasionally due to misapplication, voltage irregularity, faulty component, or just plain operator error, we find that we have overheated one of our electric motors. A Class B insulation system is rated for 130°C (266°F). The appropriate action following an overheating situation is to perform a comprehensive insulation test including Resistance-to-Ground, Capacitance-to-Ground, Polarization Index, and even an inner-phase step voltage test. Organizations with advanced maintenance and reliability will have a history or baseline of this data to compare to, resulting in a very high confidence in the health assessment of the insulation system. But what about the bearing grease? According to the National Lubricating Grease Institute (NLGI), a Group 1 general purpose grease has a temperature limit of 121°C (250°F). We need to keep in mind that if the motor overheated, the bearing may also have overheated.

 

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Don't Forget the Grease!
August 22, 2016
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