Three phase motors are normally used in commercial type operations follow the steps below to check for the most common problems for three phase motors digital volt ohmmeter check supply circuitry breakers and condition of the motors power cord if the voltage is good go to step 2 step 2 examine the motors electrical connections . Properly installed and maintained lincoln electric polyphase ac induction motors operated within the nameplate ratings will run trouble free for many years problems and premature failures often indicate input power system troubles poor or deteriorating mechanical installations or malfunctions in the driven machinery. Three phase induction motors are one of the most popular electric motors commonly found in processing plants or any manufacturing concern they are used in situations where large power is required the squirrel cage brand is the most popular and they perform various tasks wherever they are applied. Troubleshooting control circuits 3 phase motors in this course you will learn the functions of off delay timers photo electric sensors and alternating relays all while working with motor starters selector switches push buttons control relays and timers as well as how to properly troubleshoot three phase electric motors. Originated motor problems and their preventative action i introduction swings in the power supply to the motor causing the voltage line to ground to approach the magnitude of line to line voltage for example on a 4000 volt system the line to ground voltage troubleshooting induction motors
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