1A) As below Display one the PLC controlled Decanter Centrifuge touch screen, we can see 1 start & 1 stop button for centrifuge, 1 start and stop button for pump.
PLC Decanter Centrifuge Auto Model Operation.
1B) The VFD+PLC Centrifuge have two Mode, one is Auto Mode, if we choose Auto Model, first we set the Centrifuge Bowl speed, and Differential Speed, then press Decanter Centrifuge Start Button , The PLC will control to start the back motor first, and main motor, later we press the pump start Button, the pump will run until to the max capacity the centrifuge can handle.
1C) As set in the PLC, we can only start the Decanter Centrifuge start button to run the back drive motor first, second the main motor, finally the pump motor. If we do not follow the order of the starting, to protect the centrifuge, the pump motor will not start even we press the pump start first.
1D) Once the centrifuge is in overload, the PLC will stop the pump, and later stop the main motor, finally, stop the back drive motor.( This is present program in the PLC)
But for 1D) we can updated the PLC decanter centrifuge to following.
1D Updated) Once is in overload, the PLC will slow down the pump to lower down the pump capacity to the centrifuge max capacity, if the centrifuge is still in overload, the PLC will stop the pump, and later stop the main motor and finally the back drive motor.
1E) When we stop the centrifuge, the stop order is: first the pump, later the main motor, finally the back drive motor, if we do not follow the order, the PLC will control not to stop the centrifuge.
Manual Mode Operation of the PLC Decanter Centrifuge
2A) If we run the centrifuge in Manual model, first we set the bowl speed, and set differential speed, and set the pump capacity. When we start, we can only follow the order to press the bowl start and the pump start, if not, no motor will start.
2B) In the manual mode, if we stop the centrifuge, it is the same like 1E). the stop order is: first the pump, later the main motor, finally the back drive motor, if we do not follow the order, the PLC will control not to stop the centrifuge.
2C) In the manual mode, if the centrifuge is in overload, the PLC will stop the pump, and later stop the main motor, finally, stop the back drive motor.( This is present program in the PLC)
But for 2C) we can updated to following.
2C Updated) Once is in overload, the PLC will slow down the pump to lower down the pump capacity to the centrifuge max capacity ,if the centrifuge is still in overload, the PLC will stop the pump, and later stop the main motor and finally the back drive motor.
Moreover, For option, we can choose to install the temperature sensor for the bearings, and vibration sensor for the PLC Decanter Centrifuge. If the bearing increasing temperature is higher than 50C° the centrifuge will stop automatically. And if the vibration is higher than the standard, the PLC Decanter centrifuge will stop automatically. But this will be higher cost.
GN can offer customized smart control operation per user’s special requrest. For more information, contact GN group as below:
GN China: http://www.gnsolidscontrol.com
GN U.S.A:http://www.gnsolidsamerica.com