Specifications

OPERATING INSTRUCTIONS Document No. DER04098
Effective Date 06 Jun 08 Page 13 of 19
NORMAL STARTUP
Perform the following procedure at each centrifuge startup:
NORMAL STARTUP
Step Procedure
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
DER05029), 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
Turn on compressed air (explosion-proof cabinet only) to purge system. Apply electric
power to centrifuge. The 14-minute cabinet purge cycle (explosion-proof cabinet only)
should begin, followed by display of the Main screen.
5 With Main screen displayed, select Operation screen.
6
Set Bowl and Conveyor RPMs at desired speeds, unless already set. Set Pump GPM at
desired flow, unless already set.
7
Select START to turn on centrifuge. Note that Bowl and Conveyor speeds will gradually
rise until they reach their settings, and Torque % for bowl and conveyor will rise.
8
When bowl speed has reached speed setting, select Pump START to start feed pump,
and slowly introduce feed to centrifuge.
Note: Pump will not start until actual bowl speed is within 120 RPM of setting.
9
Adjust feed rate, Bowl speed, and/or Conveyor speed as required to optimize centrifuge
operation. Select Data screens at any time to review and monitor centrifuge operating
characteristics, including air conditioner status, elapsed operating time, and VFD data.
Note: Depending on conveyor differential speed setting, at bowl speeds above 300
RPM conveyor motor may rotate in opposite direction.
OPERATION
The properties of the inlet slurry and desired separation should be known in advance. This
information can be used to set and change bowl speed, differential speed, and feed rate as
required during centrifuge operation. Continual monitoring of the centrifuge control panel
indications, as well as the condition of the inlet slurry, are essential to achieving desired effluent
clarity and solids dryness. Rising conveyor torque indicates that one or more operating
parameters should be lowered to reduce torque. Conversely, falling conveyor torque shows that
speed can be raised and/or feed rate increased. Operating parameters should be adjusted, as
required, to optimize centrifuge operation and prevent automatic shutdown due to excessive bowl
or conveyor torque.