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3.6.2 Three-Phase Motors - IMPORTANT!
BEFORE STARTING THREE-PHASE MOTORS
STEPS
1. Prime pump before applying power to avoid damage to the pump and
motor.
2. Check the direction of rotation.
Three-phase motors can run in either direction, depending on how
they are connected to the power supply. When the three cable leads
are first connected to the power supply, there is a 50% chance that
the motor will run in the proper direction. To make sure the motor
running in the proper direction, carefully follow the next procedure:
Figure 3.6
Changing Motor Rotation
STEPS
A. Start the pump and note the pressure and flow rate developed
at the pump discharge.
B. Stop the pump and interchange any of the two leads (Figure
3.6, Changing Motor Rotation).
C. Start the pump again and re-check the flow rate and pressure.
D. Compare the results observed. The wire connection that
yielded the highest pressure and flow rate is the proper con-
nection. Interchange the two leads again only if necessary.
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