Amprobe PRM-2 Phase-Sequence - Manual (Page 13)

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Check the voltage presence of all phases: The LED marked as PHASE LOSS should be off. The
lack of voltage or connection of one of the leads to the circuit’s “N’ or “GND” will cause the LED to
turn off.
•
If the voltages of all phases are correct it is possible to read out the phases’ order by observing
the illumination of the LEDs marked “NORMAL (ABC)” or “REVERSE”.
•
After conducting a test the instrument should be disconnected from the circuit.
MOTOR ROTATION TEST
•
Connect the tester to the motor with the use of the test leads (the motor must be disconnected
from the power line).
•
Turn on the tester with the ON/OFF key.
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Turn the rotor in the desired direction. If the LED labeled NORMAL (ABC) illuminates, it indicates
that the phases are in accordance with electrical standards. If the LED labeled REVERSE illumi-
nates, it indicates that two phases are reversed.
•
When the LED labeled NORMAL (ABC) illuminates, mark the phases as accordant with electrical
standards.
•
After conducting a test, the tester should be turned off and disconnected from the motor. When
three-phase line is in the desired order, the motor will turn in the desired direction.