Lenze 8200 motec frequency inverter 0.25kW-7.5kW - Manual (Page 190)

Application examples
Pressure control
13−5
L
EDB82MV752 EN 5.2
The following examples show a simple pressure control with the 8200 vector frequency inverter or
8200 motec using the internal process controller.
The setpoint can either be defined in a fixed way via the code C0181 (example 1) or variably with
the motor potentiometer function (example 2).
Application example
A centrifugal pump (quadratic load characteristic) is to maintain constant pressure in a pipeline
system (e.g. water supply for private households or industrial plants).
)
Note!
l For this example, the controller must be equipped with a standard I/O since an
analog input for the actual pressure value is required.
l If you want to select the pressure setpoint via an analog source, you need an
application I/O since two analog inputs are required. This variant will not be
considered in the following.
13.1.1 Example 1: Simple pressure control with fixed setpoint selection
The actual value is supplied via the analog input of the standard I/O
0 and linked to the controller
input (PCTRL−ACT). The setpoint is defined via code C0181
1.
PCTRL1 DCTRL1-QSP DCTRL1-CINH
C0412/3
PCTRL1-NADD
C0105
C0220
C0221
+
C0181
PCTRL1-SET2
C0049
PCTRL1-RFG1
2
0
C0412/5
PCTRL1-ACT
C0412/4
PCTRL1-SET1
1
PCTRL1-SET3
C0145
C0071
C0070
C0072
1 >
C0410/18
PCTRL1-I-OFF
C0410/21
PCTRL1-STOP
C0410/19
PCTRL1-OFF
STOP
Imax,
Auto-DCB,
LU, OU
1 >
0 1
CINH, DCB
C0074
C0184
RESET
+
0
2
1
C0238
C0011
-C0011
PCTRL1-NOUT
PCTRL1-OUT
PCTRL1-QMIN
PCTRL1-NMIN
C0010
PCTRL1-ACT
C0017
PCTRL1-SET=ACT
PCTRL1-SET
NSET1-NOUT
C0138
C0239
2
0,1
C0238
C0051
+
2
1
PCTRL1-SET3
AIN1
+
AIN1-GAIN
+
AIN1-OFFSET
C0414/1
C0413/1 C0010 C0034
A
D
X3
AIN1-OUT
8
7
1
0
8200vec543
Fig. 13−2 Signal flow − overview