Operating instructions

OPERATING INSTRUCTIONS
4-6 30 Sep 13
DE-7200VFDCentrifuge
NORMAL STARTUP
Note! If Centrifuge is Heated, Before Starting Centrifuge Follow COLD
CLIMATE STARTUP Instructions Later in This Section to Ensure Proper
Bearing Lubrication.
1. Without electric power applied, open cover and rotate bowl assembly manually to check that
the bowl turns freely and no rubbing is felt.
2. Close cover, tighten all cover bolts to required torque (refer to Section 5), and ensure that all
guards are in place.
3. Verify that all personnel are clear of centrifuge and all guards are in place before applying
electric power to equipment.
4. For explosion-proof cabinet only, turn on compressed air to begin the cabinet purge cycle.
5. Apply electric power to centrifuge. The following screen will appear (on explosion-proof
cabinet, displayed after purge cycle is completed):
6. With Home screen displayed, select Operation to display the following screen:
7. Using up and down arrows, set Bowl and Conveyor Input RPMs at desired speeds:
Bowl - 750RPM minimum; Conveyor - 1RPM minimum.
8. Two options are available for controlling the feed pump. If automatic control by the PLC is
desired, enter Torque %. The pump GPM will then be varied automatically based on bowl and
conveyor torque percentages. Enter Flow GPM for operator setting of pump GPM. Note that
even with Flow selected, the PLC will vary the pump GPM or even shut down pump if
excessive torque is sensed. The Max GPM field always dictates the highest possible flow rate,
even when centrifuge is operating in Torque mode.
9. Select START to turn on centrifuge. Note that Bowl and Conveyor speeds will gradually rise
until settings are reached, and Torque % for bowl and conveyor will rise. If pump drive motor
data has been changed since previous startup, select Autotune to tune motor to VFD.
10. When bowl speed has reached speed setting, select Pump START to start feed pump, and
slowly introduce feed to centrifuge.