Company Registered in England No: 4167649 VAT Registration No: 732 5692 25 BS EN ISO 9001:2008 No: LRQ 0964389
+44 (0)1204 699 959
Hyquip Limited New Brunswick Street Horwich Bolton Lancashire BL6 7JB UK
www.hyquip.co.uk
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About this product
15/60
RE 30028-B/09.13, VT-VPCD,
Bosch Rexroth AG
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
t
Open circuit
t
Closed circuit
Pump combinations (master/slave)
t
Circuit with pressure sensorics - current
t
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.
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.
Open circuit
a
b
a
b
B
A
P
T
R5R6R7
R2
R3
R4
U
M2
M1
B
B1
MB
R(L)
T
K2
K1
MS
S
U
S
Sp
P
Rkv
Sp
P
Rkv
CLOCKWISE direction of rotation
COUNTER-CLOCKWISE direction of rotation
Closed circuit
