Variable Displacement Pump A4VG - Group VH A/S

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10/52 Bosch Rexroth AG | Mobile Hydraulics <strong>A4VG</strong> | RE 92 003/05.03HW - Hydraulic Control, Mechanical ServoThe positioning cylinder of the pump and therefore the swivelangle is varied in proportion to the movement of the controllever. The pump control is infinitely variable. Each direction offlow is assigned to one direction of lever movement.1,00,80,60,4β in °5V g max10152025303540– β in °– Vg4035302520151050,200 0,2 0,4 0,6 0,8 1,0Swivel angle b at the control lever for swiveling outwards:Start of control at β = 3°End of control at β = 29° (max. displacement V g max )mech. stop: sizes 28...71 ___________ ±40°sizes 90...250 __________ ±35°V gV g maxThe torque necessary at the control lever is between 85 and210 Ncm.The limitation of the operating range of the HW control levermust be fixed in the external control mechanism (required valuesetting).An optional DA control valve allows automotive drive control ofthe vehicle, see page 13.For pressure cut-off, see page 8.Variation: neutral position switch, LThe neutral position switch is closed when the HW controllever is in the neutral position. The switch opens if the controllever is moved out of neutral in either direction.The neutral position switch provides a safety function forsystems that require zero flow under certain operatingconditions (e.g. engine start).Standard model 1 )GraphDirection of rotation – Control – Direction of through put flowDirection of rotationanti-clockwise clockwiseSize Lever Control Through put Operatingdirection pressure flow pressure28...5671...25028...5671...250M B (size 250)BAM A (size 250)a X 2B to A M Ab X 1A to B M Ba X 2A to B M Bb X 1B to A M Aa X 2A to B M Bb X 1B to A M Aa X 2B to A M Ab X 1A to B M BSizes 28, 250 Sizes 40...180zero position switchX 1anticlockwiseclockwiseX 2ZView ZM A (size 28) anticlockwiseabclockwiseM B (size 250) M B (size 28)Technical data - neutral position switchLoading20 A (continuous)Switching power 15 A / 32 V (DC)4 A / 32 V (AC - inductive)Connector design DEUTSCH male connectorDT04-2P-EP04(mating connector see page 48)BM BM AAModel with DA control valve and neutral position switch 1 )X 1X 2abzero position switch1 ) size 28 and 250 without port F a1 and F S
RE 92 003/05.03 | <strong>A4VG</strong> Mobile Hydraulics | Bosch Rexroth AG 11/52EP - Electrical Control, With Proportional SolenoidsDepending on the set current on the two proportional solenoids,the pump is supplied with control pressure on the positioningcylinder via the EP control device. The displacement of thepump is thus infinitely variable. One solenoid is assigned toeach direction of flow.I in mA (solenoid a)1200EP11000800600EP240020001,0 0,8 0,6 0,4 0,2 0 0,2 0,4 0,6 0,8 1,0 V g– VgV g max20040060080010001200I in mA (solenoid b)V g maxGraphDirection of rotation – Control – Direction of through put flowDirection of rotationanti-clockwise clockwiseSize Solenoid Control Through put Operatingpressure flow pressure28...56a X 1A to B M Bb X 2B to A M A71...250a X 1B to A M Ab X 2A to B M B28...56a X 1B to A M Ab X 2A to B M B71...250a X 1A to B M Bb X 2B to A M ASizes 28, 250 Sizes 40...180M B (size 250)BBM BTechnical data - solenoidsEP1EP2Voltage 12 V (±20 %) 24 V (±20 %)Control currentstart of control at V g 0 400 mA 200 mAend of control at V g max 1200 mA 600 mALimiting current 1,54 A 0,77 ANominal resistance (at 20°C) 5,5 Ω 22,7 ΩDither frequency 100 Hz 100 HzDuty cycle 100 % 100 %Insulation class see connector design, page 48M AAM A (size 250)Aproportional solenoid a proportional solenoid aView ZXZ1M A (size 28)Xanticlockwisclockwiseanti-1BclockwiseclockwiseX 2XM M 2B (size 250) B (size 28)proportional solenoid bproportional solenoid bTo control the proportional solenoids the following electronicamplifiers and microcontroller are available:An optional DA control valve allows automotive drive control of– Proportional amplifier PVR (see RE 95022)the vehicle, see page 13.– Control unit MC (see RE 95050)Standard: Proportional solenoid without manual emergency– Control unit RC (see RE 95200)operation. Manual emergency operation with springreturn on demand.Standard model 1 )Model with DA control valve 1 )1 ) size 28 and 250 without port F a1 and F S
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Variable Displacement Pump A4VG - Group VH A/S

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