Variable Displacement Pump A4VG - Group VH A/S

14/52 Bosch Rexroth AG | Mobile Hydraulics A4VG | RE 92 003/05.03DG - Hydraulic Control, Direct OperatedBy switching the pilot pressure at the connections X 1 or X 2 thepositioning cylinder of the pump is directly supplied withinternal control pressure. Thus the swashplate and so thedisplacement is adjustable between V g 0 = 0 and V g max . Eachdirection of flow is assigned to a connection.Standard model 1 )pilot pressure 0 bar setting V g 0 = 0The necessary pilot pressure for the setting V g max dependsupon the operation pressure and rotational speed.Please contact us for further information.The pressure cut-off and the pressure cut-off control valve onlyoperate correctly if the pilot control unit for pressure cut-offadjustment is supplied via the P Sport.For pressure cut-off, see page 8.Assignment direction of rotation – control – direction of flowHD control see page 9 (control pressure X 1 ; X 2 ).Model with DA control valve 1 )1 ) size 28 and 250 without port F a1 and F SEZ - Electrical Two-Position Control With Switching SolenoidBy energizing either solenoid a or b, the positioning cylinder ofthe pump is directly supplied with internal control pressure, andthe pump swivels to maximum displacement. In this way, theswashplate and thus the displacement is switchable fromV g 0 = 0 to V g max . Each direction of flow is assigned to a solenoid.Technical data - solenoidsEZ1EZ2Voltage 12 V (±20 %) 24 V (±20 %)Zero position V g 0 solenoid solenoidde-energized de-energizedPosition V g max solenoid solenoidenergized energizedNominal resistance (at 20°C) 5,5 Ω 21,7 ΩNominal power 26,2 W 26,5 WMinimum effective current required 1,32 A 0,67 ADuty cycle 100 % 100 %Insulation class see connector design page 48Standard: Switching solenoid without manual emergencyoperation. Manual emergency operation with resetby valve spring on demand.For pressure cut-off, see page 8.Assignment direction of rotation – control – direction of flowDA control see page 12.Standard model 1 )1 ) size 28 and 250 without port F a1 and F SNV - Pump Configuration Without Control ModuleThe mounting surface for the pilot control unit is machined andis sealed with the standard seal for pilot control units and acover plate. This mounting assembly is ready for retrofittingpilot control units (HD, HW, EP, EZ). When used directly for”DA” control and in combinations with ”DA” control, the appropriateadjustments must be made to the spring assembly of theadjusting cylinder and control plate.Standard model 1 )1 ) size 28 and 250 without port F a1 and F S