Motor Rotation Tester Operation - AEMC instruments PMR-1 User Manual

Open phase check LED "A" is not on:
Open phase on terminal where BLACK alligator clip is
connected.
LED "B" is not on:
Open phase on terminal where RED alligator clip is con-
nected.
LED "C" is not on:
Open phase on terminal where BLUE alligator clip is con-
nected.
4. Check the rotating direction by viewing the rotation indicator
LEDs. If the counter clockwise LED is lit, alternate the connec-
tion of two of the three alligator clips.
If the clockwise LED is lit, the phase sequence is A, B and C in
the same order in which the BLACK, RED and BLUE alligator
clips are connected to the power source terminals.
4.3

Motor Rotation Tester Operation

1. Make sure the power is turned OFF on the motor under test
and that no voltage is present.
2. Connect the test leads to the motor input terminals in the
following order: Black to "A", Red to "B" and Blue to "C". Then
press the power button (see Figure 2). The power indicator
Green LED should light.
WARNING: If the Red clockwise or counter-clockwise LED is
lit before rotating the motor shaft, it means there is voltage
present. Stop the test, disconnect the test leads and turn off the
external power.
If the clockwise red LED turns on when rotating the motor
shaft in the clockwise direction, it means the 3-phase motor
connection to the power source is in the A-B-C sequence and
the 3-phase motor should rotate clockwise when powered.
8
Phase & Motor Rotation Tester Model PMR-1