AOpen DE7200 Series Instrucciones de operaciones descargar pdf (Pagina 45)

OPERATING INSTRUCTIONS

30 Sep 13 4-7

DE-7200VFDCentrifuge

Note! Pump will not start until actual bowl speed is within 120RPM of setting.

11. 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

300RPM conveyor motor may rotate in opposite direction.

COLD CLIMATE STARTUP

In below-freezing ambient conditions where steam, portable heaters, or other means is used to

raise the temperature of the centrifuge, re-lubrication of bearings may be necessary prior to

startup. If bearing housings reach a temperature of 200°F (93°C), grease may liquefy and drain

from bearings. This will result in dry running the bearings upon startup. To prevent this condition,

proceed as follows:

1. After applying heat and prior to startup, pump 15 shots of grease into each main bearing.

2. Refill conveyor bearings until grease is observed exiting the appropriate drain hole.

3. After machine is started, pump an additional five shots of grease into each main bearing.

4. Monitor bearing temperatures for the first 2 hours of centrifuge operation.

Note! It is Normal for Temperatures to Rise for 15 to 30 Minutes After Greasing

and Then Return to Normal.

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, conveyor differential speed, and feed rate

(unless set for automatic control) as required during centrifuge operation. The centrifuge control

panel indications, as well as the condition of the inlet slurry, must be monitored to ensure that

desired effluent clarity and solids dryness are achieved. 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.

The Operation screen (Figure 4-2) permits the operator to view current operating information for

the bowl, conveyor, and pump and adjust the parameters as required to meet changing

conditions.

Through this screen, the operator may view and set bowl and conveyor RPMs and torque

percentages, set feed pump flow rate, and view bearing temperatures. Adjustments of the

conveyor and bowl speeds may be performed using up and down arrows or by entering actual

numbers on the popup numeric keypad. In addition, options are provided for stopping the

centrifuge, displaying VFD operation screens, and selecting Status, Clean Out, Faults, Alarms,

and Home screens. The following parameters affect centrifuge operation: Feed rate, pond depth,

bowl speed, and conveyor speed.

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AOpen DE7200 Series Instrucciones de operaciones Pagina 45