The motor and phase rotation tester permits the electrical contractor or industrial maintenance electrician to permanently connect and tape the terminals of the motor being installed, without having to first energize the motor by a temporary hookup from a power source, if available, to determine motor rotation.
How does a 3 phase rotation tester work?
It works on the principle of induction motors. … Let us assume that the three phase supply given to the motor has a phase sequence of RYB, then the motor will rotate in clockwise direction – and, if the phase sequence of supply is reversed, then the motor will rotate in counter clockwise direction.
What is a rotation tester?
Phase rotation testers are used to determine the rotation direction of polyphase electrical systems to ensure equipment is connected properly to the mains power supply. … Phase rotation testers can help save you from the cost and embarrassment or wiring a motor backwards.
What happens if phase rotation is wrong?
When the phase sequence of a three-phase system is incorrect, the connected three-phase motors and other rotating equipment runs in the opposite direction. In many cases, this can cause a hazardous condition that may destroy product, damage machinery, and injure personnel.
Is phase rotation a live test?
This is a live test so extra care is advised! During the testing remember to constantly inspect the installation for faults and signs of damages.
How do you test a phase sequence with a multimeter?
Select the Phase Rotation setting on your mutlimeter. Inspect the three-phase motor and look for terminals — where three wires connect to the motor — labeled L1, L2 and L3. Connect the meter jacks that are similarly labeled (L1, L2, L3) to the power wires. Observe the display on your multimeter.
What is the purpose of a phase rotation meter?
Phase Sequence and Motor Rotation meter detects live phase and sequence orientation of three phase power sources and industrial equipment conductors to ensure proper installation. Motor rotation function identifies rotational direction of industrial equipment such as motors, compressors and generators.
What does phase rotation mean?
Phase rotation, or phase sequence, is the order in which the voltage waveforms of a polyphase AC source reach their respective peaks. For a three-phase system, there are only two possible phase sequences: 1-2-3 and 3-2-1, corresponding to the two possible directions of alternator rotation.