Moog ACV with CANopen bus interface
7 Servo valve functions
Flow / pressure (P) switchover
B99224-DV018-D-211, Rev. A, October 2018
228
7.13 Flow / pressure (P) switchover
The switch-over from flow (velocity) control to pressure (force) control allows a limit for the maximal force on
the piston rod. The valve will switch to pressure control if the pressure actual value is bigger than the demand
pressure. It will switch back to flow control if the output of the pressure controller is bigger than the output of
the flow controller (absolute values). The demand signal to the pilot valve will change continuous (filtered with
PT1 elements).
Figure 139: Flow / pressure switchover
7.13.1 Object 0x520E: Flow valve direction
Signal to negate the output to the valve. Thus, the direction of the axis movement can be inverted.
<
D
eman
dVa
lu
ePi
lo
t>
(0x3
300
)
X
<FlwValveDirection>
(0x520E)
<
S
pl
D
e
m
and
V
alu
e>
(0x6
310
)
<
P
rs
C
ontr
o
lle
rO
ut
pu
t>
(0x2
41
8)
Continuous signal
switching
ValveFlowControl
Index
Sub-index
Parameter name
Data type
Access
Per-
sis-
tence
Value range
Default
0x520E
0
FlwValveDirection
INT8
rw
Y
–1…1
1
