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Faizan
Three-phase motors can be checked easily by using a voltmeter or multimeter. As long as you know which wires on the motor are the right ones to check, the process is simply and you will be able to rapidly check any number of three-phase motors in little time.
Checking a 3-Step Motor
Turn of all power to the motor for safety reasons, as well as to ensure proper readings. Remove the wire cover box from the motor. Note which wires connect the power supply to the motor. As it is a three-phase power supply, there should be three wires that connect the power supply to the motor.
Mark which plastic wire connects which lead to the power, as the order these are connected will determine the rotation of the motor. Turn on your ohmmeter or multimeter (set to ohms). Remove whatever screws or tape cover the connections, exposing the copper wire.
Test the resistance by placing one lead on the connection and one lead on the motor case. If your meter does not read infinite ohms or zero ohms (often represented as OL), the motor windings may have a short. If it reads correctly, your windings are also correct and do not need to be checked, and vice versa.
Checking a 3-Step Motor
Turn of all power to the motor for safety reasons, as well as to ensure proper readings. Remove the wire cover box from the motor. Note which wires connect the power supply to the motor. As it is a three-phase power supply, there should be three wires that connect the power supply to the motor.
Mark which plastic wire connects which lead to the power, as the order these are connected will determine the rotation of the motor. Turn on your ohmmeter or multimeter (set to ohms). Remove whatever screws or tape cover the connections, exposing the copper wire.
Test the resistance by placing one lead on the connection and one lead on the motor case. If your meter does not read infinite ohms or zero ohms (often represented as OL), the motor windings may have a short. If it reads correctly, your windings are also correct and do not need to be checked, and vice versa.
Posted in: electronics
