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Warning
The rotation of the motor will generate dangerous voltages and currents on the motor
phase leads. Make sure the wires and connections are properly insulated.
3.
Connect the scope to read VCA and VBA. VCA and VBA are measured by putting the
probe ground clips on A and the scope probes on C and B.
4.
Rotate the motor CCW (i.e., rotate the shaft counter-clockwise as you face the shaft end
of the motor).
Figure 77:
CCW Rotation of the Motor
5.
Look at the phase-to-phase voltages VCA and VBA. There are two possibilities. If VCA
leads VBA, then assign B to S and C to T. If VBA leads VCA, then assign B to T and C
to S. These relationships are summarized in the figure below.
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