Specifications

INSTALLATION INSTRUCTIONS Document No. DER03022
Effective Date 23 Dec 08 Page 11 of 15
Figure 3022-9 Split Input Power 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 20 RPM with a conveyor differential speed of 5 RPM.
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 - Clockwise viewed from fan end
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 Figure 3022-8 and electrical
schematic diagram in Section 11.