Danfoss Series 90 Technical Information

Also see for Series 90: Installation Service manual

Contents

Danfoss Series 90 Technical Information Manual pdf 28 page image

piston tilts the cradle swashplate, thus varying the pump's displacement from full displacement in onedirection to full displacement in the opposite direction.The control has a mechanical feedback mechanism which moves the servo valve in relation to the inputsignal and the angular position of the swashplate. The electrical displacement control is designed so theangular rotation of the swashplate (pump displacement) is proportional to the electrical input signal. Dueto normal operating force changes, the swashplate tends to drift from the position preset by the machineoperator. Drift, sensed by feedback linkage system connecting the swashplate to the control valve, willactivate the valve and supply pressure to the servo piston, maintaining the swashplate in its presetposition.Features and Benefits• The electric displacement control is a high gain control: With only a small change of the input current,the servo valve moves to a full open position thus porting maximum flow to the servo cylinder.• Oil filled PCP case lengthens control life by preventing moisture ingression and dampeningcomponent vibrations.• All electrical displacement controls are equipped with dual coil PCPs. The user has the option of usinga single coil or both coils (in series or parallel).• Internal mechanical stops on the servo valve allow rapid changes in input signal voltages withoutdamaging the control mechanism.• Precision parts provide repeatable accurate displacement settings.• The swashplate is coupled to a feedback mechanism. The control valve drains the ends of the servopiston when an electric input signal is not present.Benefits• Pump returns to neutral after prime mover shuts down• Pump returns to neutral if external electrical input signal fails or if there is a loss of charge pressureElectric displacement control schematicM5 M4 T PX2 X1P102 024EFeedback fromswashplateTechnical Information Series 90 Axial Piston PumpsControl Options28 520L0603 • Rev 0804 • March 2016