System Manual V2 – MOVITRAC® B
143
6
PI controller
Project Planning
6.19
PI controller
You can use the implemented PI controller for temperature control, pressure control or
other applications. The PI controller can be switched on and off.
Structural diagram showing installation of the PI controller
Connect the actual value from the sensor (temperature, pressure, etc.) to analog input
AI1. You can scale the actual value up or down and assign an offset value, thereby
adapting it to the working range of the PI controller.
You can set the PI-controller setpoint using one of the six programmed fixed setpoints
or specify the setpoint using the RS-485 or fieldbus (SBus) interface (
P100 = Setpoint
source
). Furthermore you can specify the setpoint using the local setpoint potentiome-
ter.
The correcting variable of the PI controller is a speed setpoint limited to a minimum and
maximum speed (
P301=Minimum speed1
and
P302=Maximum speed1
). The setting of
the speed ramp times has no effect when the PI controller is active.
The default settings for the parameters are indicated in
bold
below.
6.19.1 Parameterization
Activating the PI
controller
Switch the PI-controller on and off using parameter P250. The values set for setpoint
and actual values mentioned in the beginning are active when you switch on the PI
controller.
The
NORMAL
setting increases the correcting variable if there is a positive system
deviation; the correcting variable is reduced if there is a negative system deviation.
The
INVERTED
setting increases the correcting variable if there is a negative system
deviation; the correcting variable is reduced if there is a positive system deviation.
Controller
parameters
You can adapt the controller to the application using the following settings:
Speed setpoint (value)
Actual
value
AI1 %
Setpoint
%
-1
1
n
max
n
min
P251 P-gain
P252 I-component
-
x
P250 PI controller
Normal
Inverted
Contr
ol diff
erence
Correcting
v
ariab
le
P301/311 n
max
P302/312 n
min
P 250
PI controller
Off
Normal
Inverted
P 251
P-gain
0 ...
1
... 64
Step width:
0.01
P 252
I-component
0 ...
1
... 2000 [s]
Bereich:
0
0.01 ... 0.99
1.0 ... 9.9
10 ... 99
100 ... 2000
Step width:
I-component OFF
0.01
0.1
1
10
Содержание MOVITRAC MC07B0037-2A3-4-00
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