Circuit Variants - Bosch Rexroth VT-VPCD Series Operating Instructions Manual

Open circuit
B1 B MB
U S MS M1 R5R6R7
Closed circuit
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The output signal of the controller activates the output stage [6] in dependence on
command/actual differences.
The position of the valve spool [11], the swivel angle of the variable displacement
pump [12a, 12b or 12c] and the system pressure [13] are measured and fed via
evaluation electronics [7] to the control loop.

5.2.1 Circuit variants

The axial piston pump A4VS...HS4 can be operated within various circuit variants.
Adjustments are therefore necessary on the axial piston pump for each variant.
The following circuit variants are possible:
Hydraulic circuit variants
Open circuit
Closed circuit
Pump combinations (master/slave)
Circuit with pressure sensorics - current
Circuit with pressure sensorics - voltage
When the axial piston pump A4VSO...HS4 is operated in the open circuit, a valve
connection block is installed between the axial piston pump A4VSO.. and
proportional valve 4WRE6-2X/822. The variant of the valve connection block depends
on the pump's direction of rotation.
T P
b a
b B A a
S
K1 K2 T R(L) R4 R3 R2 M2
Fig. 1: Pump control in the open circuit with connection of the swivel angle transducer
When the axial piston pump A4VSG...HS4 is operated in the closed circuit, a valve
connection block is installed between the axial piston pump A4VSG.. and
proportional valve 4WRE6-2X/822. The variant of this valve connection block also
depends on the pump's direction of rotation.
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About this product
CLOCKWISE direction of rotation
Rkv
COUNTER-CLOCKWISE direction of rotation
Rkv
U
RE 30028-B/09.13, VT-VPCD, Bosch Rexroth AG
15/60
Sp
P
Sp
P