Operating instructions

MAINTENANCE
31 Dec 13 5-11
DE-7200VFDCentrifuge
Cleaning Purge Unit Filter
Do not use solvents on any part of the filter assembly installed inside the purge unit. To
clean the filter element, unscrew and remove the filter bowl and then unscrew and
remove filter element. Clean filter element in soapy water or replace element.
ROTATING ASSEMBLY MAINTENANCE
Maintenance of the rotating assembly is limited to removal, cleaning, inspection, and replacement
of wear inserts. Excessive noise or vibration during centrifuge operation may indicate defective
main or conveyor bearings. If such conditions are evident, the bearings should be checked for
high temperature and excessive noise. The rotating assembly must be replaced if defective main
or conveyor bearings are found, or if internal damage to the rotating assembly is found or
suspected. The damaged rotating assembly should be returned to Derrick for overhaul.
Rotating Assembly Removal
To remove the rotating assembly, proceed as follows:
WARNING! TO AVOID SERIOUS PERSONAL INJURY BE SURE EQUIPMENT IS
LOCKED OUT, TAGGED OUT, DE
-ENERGIZED, AND HAS STOPPED
ROTATING BEFORE PERFORMING MAINTENANC
E AND/OR ADJUSTMENTS.
1. Turn off feed, shut down centrifuge, and lock out and tag out electric power to the centrifuge.
Allow rotating assembly to coast to a full stop.
2. Disconnect feed pipe from feed tube flange.
3. Remove screws securing belt guard to case, and lift and remove guard.
WARNING! WHILE OPENING AND CLOSING THE CENTRIFUGE COVER,
PERSONNEL MUST ENSURE THAT ALL BODY LIMBS AND ANY OTHER
ITEMS ARE CLEAR OF THE COVER GAP. TWO OPERATORS MUST BE USED,
WITH BOTH HANDS ON THE COVER HANDLES AT ALL TIMES. DERRICK
RECOMMENDS HAVING A HOIST AVAILABLE IF ADDITIONAL ASSISTANCE
IS DESIRED DURING THE OPENING/CLOSING PROCEDURE.
4. Remove screws securing case cover to case, and open case cover as described at the
beginning of this section.
5. Loosen screws securing torque limiter clutch half to conveyor drive motor shaft (Figure 5-4),
slide coupling half toward motor until end of motor shaft is visible, and remove spider.