Amprobe PRM-4 Phase-Sequence-Motor-Rotation-Tester - Manual (Page 9)

8
correct the problem before returning to the 3-phase rotation test.
Motor Rotation Test
This test can be used to verify the shaft rotation and the M1-M2-M3
connections or to determine the M1-M2-M3 connections on a motor
that is not marked.
�� Warning
Make all connections with circuits unpowered. If the clockwise or
counterclockwise REd indicator is oN before rotating the motor
shaft, voltage is present. Stop measuring. Remove the test leads and
turn off the external power.
Use a multimeter to verify that no voltage is present on the motor 1.
windings.
Connect the color coded test leads to the three motor input
2.
terminals M1- M2-M3. Press the power button (See figure 2). The
green indicator light will be on.
facing the motor shaft, hand rotate the motor shaft clockwise.
3.
if the clockwise indicator ( 4. � ) is on, the M1-M2-M3 connections
are correct for clockwise rotation.
if the counterclockwise (
5. � ) indicator is on, the M1-M2-M3
connections are correct for counterclockwise rotation.
if the motor rotation direction is wrong, reverse any two of the
6.
M1-M2-M3 connections and repeat the test.
After 3-phase rotation and motor phasing are verified:
Turn off power at the source. 1.
Connect the previously identified power wire l1 to motor wire 2.
M1. Repeat the connections for l2 to M2 and l3 to M3. See figure
3.
inspect the connections for electrical safety.
3.
The motor will rotate in the desired direction when power is
applied.
MAINTENANCE
if the PRM-4 appears to operate incorrectly, check the following
items:
Review the operating instructions to ensure the meter is being 1.