AOpen DE7200 Series Instruções de Operação Página 36

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INSTALLATION
3-16 01 Jan 14
DE-7200VFDCentrifuge
TANK LEVEL SWITCH CONNECTIONS (CONT’D)
Figure 3-15. Typical Tank Level Switch Connections
POLARITY TEST
WARNING! BE CERTAIN THAT MOTORS ROTATE IN CORRECT DIRECTION.
INCORRECT POLARITY OF CONVEYOR MOTOR WILL CAUSE CONVEYOR
TO ROTATE AT AN INCORRECT SPEED, WHICH WILL RESULT IN
PROCESSING PROBLEMS.
In the following procedure, polarity is critical. Be certain that all motors rotate in the correct
directions. Simply checking to see if solids are discharged out the solid end DOES NOT ensure
correct polarity!
If conveyor motor is wired incorrectly, the conveyor may become plugged or flooded depending
on the speed settings of the bowl and conveyor. Test for correct polarity of all connections as
follows:
1. Apply power to centrifuge.
2. Run bowl at 20RPM with a conveyor differential speed of 5RPM.
3. Confirm direction of rotation for bowl, conveyor, feed pump, and air conditioner condenser
motors as follows:
a. Bowl - Counterclockwise viewed from fan end
b. Conveyor - Clockwise viewed from fan end
c. Feed pump - Per manufacturer’s data
d. Air conditioner condenser fan motor - Clockwise viewed from fan end of motor
4. Correct reverse rotation by shutting down power and switching any two of the three power
leads at the terminal block(s) inside the cabinet (refer to electrical schematic diagram in
Section 8).
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