Axial Piston Variable Pump A7VO - Group VH A/S

Blocked for new applications / Für Neuanwendung gesperrtRE 92 202/03.06 A7VO Bosch Rexroth AG 9/32LR Power ControlLR... Power control with stroke limiterCircuit diagram LRH1The hydraulic stroke limiter can be used to vary or limit thedisplacement of the pump continuously over the whole controlrange. The displacement is set with the pilot pressure p St (max.40 bar) applied to port X 1 .The power control overrides the hydraulic stroke limiter control,i.e. below the hyperbolic power characteristic, the displacementis controlled, by the pilot pressure. When exceeding thepower characteristic with a set flow or load pressure, the powercontrol overrides and reduces the displacement followingthe hyperbolic characteristic.URX1V g minV g maxY3B (A)A1X3A control pressure of 40 bar is required to swivel the pumpfrom its starting position V g min to V g max .The required control pressure is taken either from the operatingpressure, or from the externally applied control pressure at theY 3 port.T1STo ensure the control even at low operating pressure < 40 barthe port Y 3 must be supplied with an external control pressureof approx. 40 bar.Circuit diagram LRDH1LRH1 Hydraulic stroke limiter(negative characteristic)Control from V g max to V g minX1Y3With increasing pilot pressure the pump swivels to a smallerdisplacement.Setting range for start of control ________________ 4 – 15 barWhen ordering, state in clear text the start of control.URV g maxB (A)A1Starting position without control signal (pilot pressure): V g maxCharacteristic LRH1V g minX3T1Increase in pilot pressure (V g max – V g min ) ________Δp = 25 bar40S35Pilot pressure pSt in bar30252015104Setting range0 0,2 0,4 0,6 0,8 1,0V g min Displacement V g max