Hytec Johannesburg 199/01CM:New variable-speed pressure and flow control system

December 20th, 2012, Published in Articles: Vector

Bosch Rexroth’s innovative new variable-speed pressure and flow control system provides a dynamic and economical solution for controlling oil volume and pressure. Depending on the cycle characteristics of the application, the Sytronix DFEn 5000 variable-speed pump drives produce energy savings of up to 45% compared to variable pumps with constant speed. This variable speed pump drive is based on the proven pressure and flow rate control system, the direct front end (DFE). An electro-hydraulic driven axial piston pump is controlled by a variable-speed drive. Sensors detect the current system pressure as well as the current engine speed, and transfer these values to the pump-integrated digital on-board electronics. After matching actual values with the target values transmitted by the control, the integrated control calculates the optimal speed for the entire drive system. The de-stroking of the variable displacement pump lowers the flow rate and reduces the engine load. The optimum speed for maintaining pressure is between 300 and 400 L/min, depending on the pressure.

Contact Freddie Kuhn, Hytec Johannesburg, Tel 011 975-9700, freddie.kuhn@hytec.co.za

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