The PRT Phase Rotation Tester from ATC Diversified Electronics is a hand-held tester that takes the guesswork out of connecting a three-phase motor. The PRT identifies the leads of a three-phase motor and detects the sequence of a three-phase power line. Once the motor and line leads are identified, the motor can be wired so that it turns in the proper direction on the first try.
The PRT-100 tester works on voltages up to 700 VAC phase-to-phase. Sensors are rated for 12 VDC. A simple momentary test button starts the test. LEDs indicate the sequence of a three-phase line.
To identify the leads of a three-phase line, connect the tester to the energized line and press the test button. Either the “Normal” or “Reverse” LED will glow. If reversed, switch the leads and test again. When the normal LED is on, label the leads accordingly. If the “Loss” LED turns on, this indicates phase loss or no voltage. Either must be addressed before the tester leads can be properly identified.
To identify the leads of a three-phase motor, connect the tester to the de-energized motor, turn the rotor in the desired direction and press the test button. If the reverse LED is on, switch the leads and repeat. When the normal LED turns on, the motor can be labeled accordingly.
PRT-100 testers are built for the industrial environment, with operating temperatures ranging from 32 to 113°F. The leads are 18 inches long, color coded for simple identification. They are battery clip type and encased by a protective sheath.
For more information about the PRT Series Phase Rotation Tester from ATC Diversified Electronics, contact our experts today!
ATC Diversified Electronics is a Marsh Bellofram company.