AOpen DE7200 Series Instrukcje Operacyjne Pobierz pdf (Strona 59)

OPERATING INSTRUCTIONS

30 Sep 13 4-21

DE-7200VFDCentrifuge

NORMAL SHUTDOWN

The normal shutdown procedure is to be used for controlled stopping of operation. Normal

shutdown is performed for routine activities such as cleaning, lubrication, inspection, or

adjustment.

Note!

Proper shutdown and flushing of the bowl can prevent high vibration at

the next startup.

Step Procedure

1 Stop the feed pump.

Open supply of fresh flushing liquid 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.

As the speed gradually drops during the shutdown period, the solids chute can also be

flushed. While bowl is rotating, attach a hose to fitting on the hinge side of the case

(Figure 3-11) to wash the exterior of the rotating assembly and interior of the case

assembly.

Select STOP on Operation screen to shut down centrifuge. When bowl speed falls to

less than 200RPM, conveyor gearbox drive motor automatically shuts down.

For cabinet with purge system, maintain air supply to cabinet purge unit to keep cabinet

pressurized.

AUTOMATIC SHUTDOWN

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.

Excessive Vibration

Excessive vibration of the centrifuge will cause the vibration switch to interrupt electric power to

the centrifuge run relay, shutting down the machine. Such excessive vibration may occur during

startup or normal operation due to slumping of the wall cake or other unbalanced condition of the

bowl. The machine may be re-started by pressing the reset button on the vibration switch and

then using the Normal Startup procedure above.

If the machine continually trips during normal startup, flush the bowl with fresh water while running

the automatic cleanout routine.

Main Bearing Temperatures

Temperature sensors are installed on the liquid and solid end main bearings and connected to the

PLC. Bearing temperatures are continuously displayed on the Operation screen. An alarm

message is displayed on the control panel when either bearing temperature exceeds 225°F

(107°C). If temperature rises to 250°F (120°C), a fault message appears and the centrifuge is

shut down. Excessively high bearing temperatures usually indicate bearing failure, which can

result from inadequate or excessive lubrication, contamination, or severe wear. Contact Derrick

Service department for assistance.

1 2 ... 54 55 56 57 58 59 60 61 62 63 64 ... 166 167

Komentarze do niniejszej Instrukcji

Brak uwag

AOpen DE7200 Series Instrukcje Operacyjne Strona 59

Komentarze do niniejszej Instrukcji

Powiązane produkty i podręczniki dla Części komputerowe AOpen DE7200 Series