Moog ACV with CANopen bus interface
7 Servo valve functions
Spool position (Q) / pressure (P) switchover
B99224-DV018-D-211, Rev. A, October 2018
188
7.6.1 Object 0x586C[N]: pQ switching mode
This parameter defines the p/Q switching mode.
Value description
7.6.1.1 Object 0x3300: Demand value pilot
This parameter contains the output signal of the p/Q switchover function.
7.6.2 Minimum criterion in positive direction (switching mode 0)
If the <pQSwitchingMode> (0x586C) is set to 0 (minimum criterion in positive direction), the following state
machine is used to switch between spool position control and pressure control. In case of a two stage valve
only mode 0 is possible and the parameter <DemandValvePilot> (0x3300) is used instead of
<SplDemandValue> (0x6310).
Figure 94: State machine used to switch between spool position control and pressure control
ValvePressureControl
Index
Sub-index
Parameter name
Data type
Access
Per-
sistence
Value range
Default
0x586C
N=1…16
pQSwitchingMode
UINT8
rw
Y
UINT8
0
<pQSwitchingMode>
Description
0
Minimum criterion in positive direction.
1
Minimum criterion in both directions.
2
Force exceeded in both directions.
Table 85: Possible values of parameter <pQSwitchingMode> (0x586C)
ValvePositionControl
Index
Sub-index
Parameter name
Data type
Access
Per-
sistence
Value range
Default
0x3300
0
DemandValuePilot
INT16
ro
-
INT16
None
Spool position
control
Pressure
control
spldem>cmpprsout
else
Value
Parameter
spldem
<SplDemandValue> (0x6310)
cmpprsout
<ControllerOutput> (0x2418)
