Drive controllers make servo pumps more efficient 

By controlling the pump drive, pressure and flow can be optimally adapted to the requirements of servo-hydraulic machines at any time. This is the case, for example, in injection moulding machines where cycle times are key. Here, the COMBIVERT F6 drive controller and S6 servo drives from KEB come in. With the precise and high performance solution for pump control, they ensure continuous control, as well as faster cycle times, to increase the productivity of injection moulding machines.  

Another goal of the control: the hydraulic valves are to be protected and the service life of the pump is to be extended. For this purpose, there are various parameters in the firmware of the drive controllers whereby the lifetime and availability of the injection moulding machines can be significantly increased. 

Designed for high requirements 

Various features that have been specifically integrated into KEB’s drive controller firmware are proving useful in practice. “Among other things, we have considered ‘anti-cogging’ in our solution,” says Michael Schulz, application engineer at KEB. “This enables KEB’s inverters to equalise disturbing cogging torques, which are system-immanent in permanent magnet motors. The result is significantly improved concentricity on the motor axis. In combination with the notch filter from the Wizard, which serves to avoid resonances in the hydraulic circuit, the result is highly precise and very good control of flow and pressure. Furthermore, there is the additional feature that the PQ control can be switched on and off by setting a bit. The user therefore has a regular KEB drive in place. This can lead to cost savings.”

Basically, the choice of servo pumps is always a sensible idea when hydraulic systems are confronted with highly dynamic or highly constant control requirements. These include various areas of plastics processing, hydraulics and bending presses, but also applications in the field of lifting technology. Here, according to Schulz, the stability of the KEB system and the performance of the software solution are particularly evident in the control of pressure and flow.