AOpen DE7200 Series Betriebsanleitung PDF herunterladen (Seite 58)

OPERATING INSTRUCTIONS

4-20 30 Sep 13

DE-7200VFDCentrifuge

CLEAN OUT (CONT’D)

Figure 4-20. Clean Out Screen

Provision is included for selecting the automatic or manual cleanout options. When the cleanout

process has timed out or was stopped by the operator, the Operation screen or the Faults screen

may be displayed.

If automatic reduction of the pump speed is unable to clear out solids from the conveyor, the

torque will continue to rise and the centrifuge will shut down. The clean out procedure should then

be used to clear out the impacted solids and return the centrifuge to operational status. The

following paragraphs explain the two cleanout options: automatic and manual.

Automatic Cleanout

When the automatic option is selected, the system will perform a cleanout cycle for a pre-set

duration. The bowl operates at 300 RPM, while the conveyor operates in the forward direction at a

speed that varies from 8 to 30 RPM. If excessive resistance is encountered during the cleanout,

the system will stop and alert the operator that the automatic cleanout has been unable to clear

the centrifuge. Operator intervention is then required to repeat the automatic cleanout operation.

Manual Cleanout

Note!

The manual cleanout should be used only if multiple automatic cleanout

attempts are unsuccessful.

When the manual cleanout option is selected, the operator may elect to jog the conveyor in

forward and reverse with the bowl set at zero RPM. If desired, however, the operator may choose

to operate the bowl as well as the conveyor. Reverse rotation of the conveyor is governed by a

timer that terminates reverse operation after a pre-set interval. The primary purpose of the manual

cleanout mode is to permit jogging the conveyor in an effort to remove impacted material.

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AOpen DE7200 Series Betriebsanleitung Seite 58