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الأربعاء، 27 أكتوبر، 2010

WHAT CHECKS YOU MUST CARRY OUT ‎WHEN A MOTOR TRIPS ON THERMAL ‎OVERLOAD?‎


WHAT CHECKS YOU MUST CARRY OUT ‎WHEN A MOTOR TRIPS ON
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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