Decanter scroll drive system

The pump unit uses an electric motor to drive a hydraulic pump. Oil flowing from this pump through a control block controls the oil flow to the ROTODIFF. The hydraulic system pressure is proportional to the scroll torque and, as a result, the pressure can be directly used as a control variable. Similarly to solids loading of the bowl and the generated scroll torque, the differential speed is automatically controlled with a high degree of accuracy.

Differential speed control of scroll drive

The hydraulic operating pressure circuit that is independent on the bowl drive contains all adjusting components and safety valves.

It is possible to select between three control systems depending on the requirement:

VFD-Control

Automatic, analogue control, electronic with frequency converter

The drive system controlled by the frequency converter has excellent energy efficiency. Oil displacement to the ROTODIFF is controlled by adjusting the pump speed. As the differential speed is proportional to the conveyed oil quantity, automatic control can be granted without any problems. The hydraulic system pressure is also proportional to the scroll torque and is used directly as a control variable.

B/C-Control

Automatic, analogue control,electronic with proportional throttle valve

Using the pressure sensor, the system pressure (scroll torque) is recorded and the proportional throttle valve is actuated accordingly by an electronic device. As such, precise control of the oil flow to the ROTODIFF is possible and the optimal differential speed required for the separation process is automatically controlled accordingly.

C-Control

Automatic, analogue control, hydraulic

The hydrostatical regulation control block uses the direct feedback of the system pressure (scroll torque) as a control variable. The default control values are set using hydraulic valves. The differential speed required for optimal solid material output is automatically controlled. C-Control units are easy to operate and extremely durable. (suitable for Ex protection applications)