S900-01-880 Issue C
Page 36 © Edwards Limited 2008. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Installation
3.10.2 Check the direction of rotation
It is possible for the three phase electrical supply to the motor to be phased incorrectly. If the supply is phased
incorrectly, the rotors will rotate in the reverse direction or remain stationary.
Watch the motor fan and switch on the electrical supply to the booster pump for two or three seconds, then switch
the pump off. The correct direction of rotation is shown by an arrow on the motor: see Figures 1 and 2.
If the direction of rotation is incorrect, isolate the external electrical supply, correct the electrical connections to
the booster pump, then perform the direction check again.
Blank off the inlet or connect the booster pump to the vacuum system before you check the
direction of rotation. If you do not, there is a danger of entanglement or of objects being trapped
in the rotating rotors.
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