If there are stricter requirements concerning the volumetric flow rate accuracy,
QLeak must be taken into account as a function of pressure and nRefPump must be
increased accordingly.
In addition, limiting the pressure upwards to a maximum pressure of pmax is usually
a requirement. Moreover, a minimum pressure of pmin may also be required. An
additional pressure limiting control system is set up for this purpose. If the configured
pressure limits are reached, the motor speed will be dynamically limited upwards or
downwards accordingly.
NOTE
l
To do so, the pressure regulator must also be parametrized and
set.
In addition to the pressure limitation, the minimum and maximum volumetric flow rate
can be set via a volumetric flow rate limitation (see Section "Hydraulic Limitations"
MOOG
ID No.: CB40859-001 Date: 11/2020
MSD Servo Drive - Device Help
199
7 Control
Image 7.69: “Volumetric flow rate control” screen
Designation
Description
Parameters
Index
pAct
Pressure actual value
pAct
Pressure actual value
pAct2
One of the two values, selectable with
P 2840[3]
2847
2847
0
1
QRefInput
Volumetric flow rate setpoint
QRef
2847
3
pmax
max. pressure limit
pMax
max. pressure reference value
pRef
One of the two values, selectable with
P 2840[4, 5]
2850
2847
6
2
Legend for “Volumetric flow rate control”