Sauer-Danfoss series S45 axial piston open circuit

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LoaD sensinG oPen CiRCuit system P101 658E Reservoir 8 520L0519 • Rev FN • July 2009 Series 45 Axial Piston Open Circuit Pumps Technical Information General information The pump receives fluid directly from the reservoir through the inlet line. A screen in the inlet line protects the pump from large contaminants. The pump outlet feeds a PVG-32 multi-section, load sensing, directional control valve. The PVG valve directs pump flow to the cylinder and gear motor. A heat exchanger cools the fluid returning from the valve. A filter cleans the fluid before it returns to the reservoir. Flow in the circuit determines the speed of the actuators. The position of the PVG valve determines the flow demand. A hydraulic pressure signal (LS signal) communicates demand to the pump control. The pump control monitors the pressure differential between pump outlet and the LS signal, and regulates servo pressure to control the swashplate angle. Swashplate angle determines pump flow. Actuator load determines system pressure. The pump control monitors system pressure and will decrease the swashplate angle to reduce flow if system pressure reaches the PC setting. A system relief valve in the PVG valve acts as a back-up to control system pressure. Pictorial circuit diagram Filter K/L Frame Series 45 open circuit axial piston pump with load sensing control Heat exchanger PVG 32 mulit-section load sensing control valve Double-acting cylinder Bi-directional gear motor System pressure Servo pressure Actuator pressure Load sense pressure Actuator return Suction / case drain / system return
PRessuRe ComPensateD ContRoLs For additional system protection, install a relief valve in the pump outlet line. Series 45 Axial Piston Open Circuit Pumps Technical Information General information operation The PC control maintains constant system pressure in the hydraulic circuit by varying the output flow of the pump. Used with a closed center control valve, the pump remains in high pressure standby mode at the PC setting with zero flow until the function is actuated. This condition is often called a dead head condition. Typical operating curve Q max Flow 0 0 Pressure Once the closed center valve is opened, the PC control senses the immediate drop in system pressure and increases pump flow by increasing the swashplate 520L0519 • Rev FN • July 2009 PC setting P101 166E Simple closed-center circuit P101 965 angle. The pump continues to increase flow until system pressure reaches the PC setting. If system pressure exceeds the PC setting, the PC control reduces the swashplate angle to maintain system pressure by reducing flow. The PC control continues to monitor system pressure and changes swashplate angle to match the output flow with the work function pressure requirements. If the demand for flow exceeds the capacity of the pump, the PC control directs the pump to maximum displacement. In this condition, actual system pressure depends on the actuator load. Each section includes control schematic diagrams, setting ranges, and response / recovery times for each control available. Response is the time (in milliseconds) for the pump to reach zero displacement when commanded by the control. Recovery is the time (in milliseconds) for the pump to reach full displacement when commanded by the control. Actual times can vary depending on application conditions. Pressure compensated system characteristics • Constant pressure and variable flow • High pressure standby mode when flow is not needed • System flow adjusts to meet system requirements • Single pump can provide flow to multiple work functions • Quick response to system flow and pressure requirements typical applications for pressure compensated systems • Constant force cylinders (bailers, compactors, refuse trucks) • On/off fan drives 9
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Series 45 Axial Piston Open Circuit
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instaLLation DRawinGs SY STEM PORT
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instaLLation DRawinGs (continued) S
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DisPLaCement LimiteR enDCaPs Series
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sPeCifiCations For general operatin
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PeRfoRmanCe f90C Flow and power dat
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oRDeR CoDe (continued) Series 45 Ax
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aDJustaBLe DisPLaCement LimiteR anD
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axiaL PoRteD enDCaP (continued) PC
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oRDeR CoDe Series 45 Axial Piston O
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Sauer-Danfoss series S45 axial piston open circuit

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