Specifications
Document No. DER04098 OPERATING INSTRUCTIONS
Page 18 of 19 Effective Date 06 Jun 08
NORMAL SHUTDOWN
The normal shutdown procedure is to be used for controlled stopping of operation. Normal
shutdown is performed for routine cleaning, lubrication, inspection, adjustment, end of shift, or
other activity requiring the machine to be stationary.
NORMAL SHUTDOWN
Step Procedure
1 Stop the feed pump.
2
Initially continue the supply of fresh flushing water or oil to remove all solids from
conveyor and bowl. Continue flushing for 3 to 5 minutes after feed pump has been shut
down. Regardless of shutdown duration, the conveyor operates at a pre-set differential
speed while the bowl decelerates to a stop. This process cleans the bowl during the
shutdown. The centrifugal force holds the flushing liquid against the bowl wall during the
flushing procedure.
As the speed gradually drops during the shutdown period, the solids chute can also be
flushed. Fittings on the hinge side of the case permit attachment of a hose to wash the
exterior of the rotating assembly and interior of the case assembly.
3
After standstill of the centrifuge (which may take more than 10 minutes after interrupting
power to the bowl motor), the centrifuge should be restarted for 20 to 30 seconds to
clear away solids released during collapse of the water ring.
4
Conveyor gearbox drive motor automatically shuts down when bowl speed falls to less
than 200 RPM.
5
Open fused disconnect supplying electric power to the machine, and lock out and tag
out machine.
6 For cabinet with purge system, turn off compressed air supply to cabinet purge unit.
EMERGENCY SHUTDOWN
To immediately stop the centrifuge in case of emergency, press the EMERGENCY STOP button
on the control cabinet or centrifuge, select STOP on the Operation screen, or open the fused
disconnect supplying electric power to the machine.
AUTOMATIC SHUTDOWNS
The centrifuge has built-in safety features to protect the equipment. These features will result in
automatic shutdown of the centrifuge before damage occurs. The following paragraphs describe
these automatic shutdowns.