Moog ACV with CANopen bus interface
7 Servo valve functions
Spool position setpoint conditioning / demand value generator
B99224-DV018-D-211, Rev. A, October 2018
149
7.2.7.2.4 Object 0x434A: Look-up table
This object contains the output values corresponding to the positive input values.
7.2.8 Dead band compensation
Servo valves with overlap have virtually no flow when the spool is near the center or null position, i.e., inside
the overlap. The overlap region is designed to have small leakage and to achieve a reliable fail safe position.
The dead band compensation function compensates for the spool overlap of the servo valve so that the flow
dead band is reduced or effectively removed. With the parameter <DeadbandCompensation_Type>
(0x6342), the type of the dead band compensation function is selected or the function is switched off. The
step height for the positive and negative direction of movement is set with the parameters <DeadbandCom-
pensation_ASide> (0x6343) and <DeadbandCompensation_BSide> (0x6344).
The parameter <DeadbandCompensation_ASide> (0x6343) specifies the step height on the positive side and
the parameter <DeadbandCompensation_BSide> (0x6344) the step height on the negative side. The border
where the dead band compensation is effective is set by the parameter <DeadbandCompensation_Thresh-
old> (0x6345).
Figure 64: Dead band compensation
ValvePositionControl_DemandValueGenerator
Index
Sub-index
Parameter name
Data type
Access
Per-
sis-
tence
Value range
Default
0x434A
1…128
CharacteristicCompensation_LookUpTable
INT16
rw
Y
INT16
0
<DeadbandCompensation_ASide>
(0x6343)
<DeadbandCompensation_BSide>
(0x6344)
+
˜
<DeadbandCompensation_Threshold>
(0x6345)
Spool position
dead band
compenstation
input
output
<DeadbandCompensation_Type>
(0x6342)
