Keba ServoOne - Page 201

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"
on page 186).
ID No.: 0842.26B.5-01Date: 09.2020
ServoOne- Device Help
201
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”