Designation
Description
Parameters
Index
pmin
Min. pressure limit
pMin
Min. pressure reference value
pRef
One of the two values, selectable with
P 2840[4, 5]
2850
2847
5
2
PI(D) pressure controller (derivative term not
implemented at the time of writing)
2850
0-4
n*
Pump speed setpoint
Comment:
Motor speed setpoint (gearing!):
Scope ID 6: nref
2843
9
nmin
nmax
Speed limit pressure control
2851
2851
5
6
nActPump
Actual pump speed value
Comment:
Actual motor speed (gearing!):
Scope ID 13: nact
2843
12
QLeakCalc
L
QL,calc = Calculated leakage volumetric
flow rate
2843
6
QCalc
Q,calc 0 Calculated volumetric flow rate
2843
5
Qth
Theoretical volumetric flow rate
2843
14
QLeak
Leakage volumetric flow rate
Legend for “Volumetric flow rate control” (continue)
7.11.8.2 Volumetric flow rate control without pressure limitation
If there is no need for a pressure limitation, a volumetric flow rate control without
pressure limitation (VolCon(5) = volumetric flow rate control (without pressure
limitation)) can be selected in P 2860 - HYD_TabConMode. This provides the same
functions but is not linked to the pressure control. Moreover, the pressure regulator
does not need to be parametrized for this control mode.
MOOG
ID No.: CB40859-001 Date: 11/2020
MSD Servo Drive - Device Help
200
7 Control
7.11.8.3 Leakage compensation
If there is a volumetric flow rate sensor available (this can also be determined based
on a measured cylinder speed as an alternative), measured value Qmess can
optionally be used for leakage compensation.
In this case, volumetric flow rate control with steady-state accuracy will be achieved.
ID
Index Name / Setting
Unit Description
2840
9
QLeakEst
Flow rate leakage estimation method
0: NONE(0)= No leakage
compensation
No leakage compensation
1: OBS(1)= Observer
Observer (see leakage volumetric flow rate
estimate figure)
2: MEAS(2)= Directly
measured
The measured value will be used directly (this
may result in higher dynamic performance than
with OBS(1), but heavy noise is also possible!)
(TEST IMPLEMENTATION)
3: CTRL(3)= PI controller
PI controller (Kp:
P 2849[2] - lfe_K
, Tn:
P 2849
[3] - lfe_TN
)
Table 7.81: Selection of leakage compensation