WHAT CHECKS YOU MUST CARRY OUT WHEN A MOTOR TRIPS ON
THERMAL OVERLOAD?
THERMAL OVERLOAD?
A) CHECK THE HEALTHINESS OF ALL THREE PHASES.
B) ENSURE ALL CONNECTION TIGHTNESS IN THE POWER CIRCUIT RIGHT FROM CONTACTOR UP TO MOTOR TERMINAL.
C) TAKE THE WINDING RESISTANCE MEASUREMENT AND SHOULD BE SAME FOR ALL 3 WINDINGS.
D) ROTATE THE SHAFT AND CHECK FOR JAMMING.IT SHOULD TURN FREELY.
E) CHECK THE CONTACTOR CONTACTS AND MAKE SURE THAT THERE IS NO PITTING ON THEM AND CONTACTS MAKE FIRMLY.
F) START THE MOTOR AND MEASURE THE CURRENTS IN ALL THE THREE PHASES WITH A TONGUE TESTER.IT SHOULD BE WELL WITHIN THE RATING OF THE MOTOR'S RATED CURRENT.IF THE MOTOR STILL TRIPS ON THERMAL OVERLOAD, SURELY THE BI-****LLIC THERMAL OVERLOAD IS TO BE CALIBRATED AND SET UP TO THE FULL LOAD RATING OF THE MOTOR.
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