volumetric flow rate control of the position controller. In addition, the filter can be
switched active or inactive for every control type via 6 bits in parameter P 2884
HYD_AdvFilCtrl (filter output is active if respective bit=1).
Bit
Control type
0
Pressure control
1
Volume flow rate control
2
Cylinder speed control
3
Cylinder position control
4
Pump speed control
5
Volume flow rate control (without pressure limitation)
Table 7.85: Advanced filter settings
The coefficients a1 to b2 can be calculated using a mathematical software tool or a
coefficient calculator. The coefficients c0 serve as gain factors at the output of the
respective filter. To evaluate the quality of the filter, two scope variables are
available for input and output variables (P 2843.24 AdvFilterOut, P 2843.31
AdvFilterIn).
ID
Index Name
Unit Description
2876
HYD_AdvFilSel
Advanced Filter Selection
2876
0
Type
Hydraulic advanced filter: type (0=off), (electronic
damping)
2876
1
Source (input filter 1)
Selector of input to filter 1
OFF (0) = no effect on control
PressAct (1) = actual pressure value in bar
cyl_nACT (2) = cylinder speed in rpm
CylSpeedAct (3) = cylinder speed in mm/s
2876
2
Sink (output filter 2)
Selector to output from filter 2
OFF (0) = no effect on control
nFF (1) = Additive speed setpoint in rpm
VolFF (2) = Additive volumentric flow rate setpoint in
rpm
Table 7.86: Parameter P 2876 HYD_AdvFilSel
MOOG
ID No.: CB40859-001 Date: 11/2020
MSD Servo Drive - Device Help
208
7 Control
ID
Index Name
Unit Description
2877
HYD_AdvFilCoeff
Advanced Filter Coefficients (electronic damping)
2877
0
BiQuad filter 1: a1
Hydraulic advanced filter coefficient: filter 1, a1
2877
1
BiQuad filter 1: a2
Hydraulic advanced filter coefficient: filter 1, a2
2877
2
BiQuad filter 1: b0
Hydraulic advanced filter coefficient: filter 1, b0
2877
3
BiQuad filter 1: b1
Hydraulic advanced filter coefficient: filter 1, b1
2877
4
BiQuad filter 1: b2
Hydraulic advanced filter coefficient: filter 1, b2
2877
5
BiQuad filter 1: c0
Hydraulic advanced filter coefficient: filter 1, c0
2877
6
BiQuad filter 2: a1
Hydraulic advanced filter coefficient: filter 2, a1
2877
7
BiQuad filter 2: a2
Hydraulic advanced filter coefficient: filter 2, a2
2877
8
BiQuad filter 2: b0
Hydraulic advanced filter coefficient: filter 2, b0
2877
9
BiQuad filter 2: b1
Hydraulic advanced filter coefficient: filter 2, b1
2877
10
BiQuad filter 2: b2
Hydraulic advanced filter coefficient: filter 2, b2
2877
11
BiQuad filter 2: c0
Hydraulic advanced filter coefficient: filter 2, c0
Table 7.87: Parameter P 2877 HYD_AdvFilCoeff
7.11.12 Example: Pressure and pump speed control
This example shows which parameter settings need to be configured in order to
operate a servo pump with pressure and pump speed control. Before configuring the
parameters for the hydraulic system, the settings for the motor and encoder need to
be configured first. After this, “Torque control/Hydraulic control” must be selected as
the control mode and the selection of the reference setpoint must be set to
“Hydraulic profile” in the hydraulic basic settings.