
7.11.13 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.
Image 7.82: “Hydraulic basic settings” screen
ID
Index Name
Value
Unit Description
Type
PDO
300
0
CON_CfgCon
TCON (1)
Select control mode
uint16
x
159
0
MPRO_CTRL_SEL
DS402 (5)
Motion profile: selection
uint16
x
165
0
MPRO_REF_SEL
HYDRAULIC
(12)
Motion profile: selection
uint16
x
Table 7.88: Settings for control mode and motion profile
ID No.: 0842.26B.5-01 Date: 09.2020
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7 Control
Now the pump specifications – as found on the rating plate or data sheet – need to
be entered into P 2851 - HYD_Pump. This is also where the minimum and maximum
speed limits for the pump and the gear ratio between the motor and the pump are
set.
Image 7.83: “Pump settings” screen
ID
Index Name
Value
Unit
Description
Type
PDO
2851
HYD_Pump
Pump parameters
2851
0
displ
5.4
ccm/rev
Offset
float32
2851
1
cTorque
0.0859437 Nm/bar
Torque constant
float32
2851
2
pNom
250
bar
Nominal pressure
float32
2851
3
nNom
1500
rpm
Rated speed
float32
Table 7.89: Pump data settings