Operating instructions

MAINTENANCE
31 Dec 13 5-5
DE-7200VFDCentrifuge
9. Re-fill gearbox with correct product and quantity listed in Lubrication Chart.
10. Re-install fill and vent plugs, and tighten securely.
11. Close and secure top cover.
DRIVE BELT REPLACEMENT
DANGER! HIGH VOLTAGE! SHUT DOWN, LOCK OUT, AND TAG OUT
ELECTRIC POWER, AND ENSURE THAT EQUIPMENT HAS STOPPED
ROTATING BEFORE WORKING ON THIS EQUIPMENT.
SAFETY GLASSES MUST BE WORN AT ALL TIMES WHILE PERFORMING
ANY MAINTENANCE PROCEDURE. FAILURE TO WEAR SAFETY GLASSES
MAY RESULT IN SERIOUS EYE INJURY OR PERMANENT LOSS OF VISION.
Before beginning any centrifuge maintenance, shut down, lock out, and tag out equipment. The
drive belts should be tensioned periodically and replaced if inspection reveals damage or
deterioration. To tension and/or replace the belts, proceed as follows:
WARNING! ALWAYS ALLOW ROTATING ASSEMBLY TO COAST TO A
COMPLETE STOP BEFORE REMOVING BELT GUARD.
1. Shut down, lock out, and tag out electric power to the centrifuge.
2. Remove belt guard.
3. Loosen mounting screws securing torque limiter clutch half to conveyor drive motor shaft
(Figure 5-2), and slide clutch half toward motor until end of motor shaft is visible.
4. Loosen bolts securing bowl drive motor to base, turn tensioning bolt to loosen belts, and
remove belts from bowl and motor sheaves by maneuvering out between conveyor drive
motor and conveyor shaft.
5. Install new belts onto bowl drive motor and bowl sheaves.
6. Turn tensioning bolt to apply tension to belt. Apply sufficient belt tension to permit a 1/2”
(13mm) deflection when pressed with a 17 lb (75 N) force at the midpoint of the belt (Figure 5-
3). Correct tension will prevent slippage without overloading bearings. After correct tension is
set, tighten motor base retaining bolts to secure motor.
7. Slide drive motor clutch half back into engagement with gearbox half, and set gap between
clutch halves at about 0.1875” to 0.250” (4.8mm to 6.4mm), and then position clutch axially so
that midpoint of spider is aligned with proximity switch.
8. Tighten mounting screws in motor clutch half to 184 ft lbs (250 Nm).
9. Install and secure belt guard.