Wilo CronoLine-IL-E Notice De Montage Et De Mise En Service page 127

H
H
n
max
n
min
Fig. 33: Constant speed
Installation and operating instructions • Wilo-CronoLine-IL-E, Wilo-CronoTwin-DL-E, Wilo-CronoBloc-BL-E • Ed.01/2024-02
Constant speed
"Constant speed" mode deactivates all other control modes. The speed of the pump is kept
to a constant value and set using the rotary knob. The speed range is dependent on the mo-
tor and pump type.
PID-Control
The PID controller used is a standard PID controller as described in the control engineering
literature.
The PID controller determines the difference between the measured actual value and the de-
n = const sired setpoint (control deviation). It attempts to match the actual value to the setpoint by
max
changing the pump speed via its output signal.
Q
The appropriate sensors make various controls possible (e.g. pressure, differential pressure,
Q
temperature or flow control). When selecting a sensor, pay attention to the electrical values
in the "Terminal assignment" table.
The control behaviour can be optimised by adjusting the P, I and D parameters.
The proportional component (P component) of the controller amplifies the controller's out-
put signal directly and linearly. The sign of the P term determines the controller's direction of
action.
The integral component (I component) of the controller integrates via the control deviation.
A constant deviation results in a linear amplification of the output signal until the setpoint is
reached. The I controller is an accurate but slow controller that results in no permanent con-
trol deviation.
The differential component (D component) of the controller does not react to the control
deviation, but only to its rate of change. This affects the rate at which the system responds.
The D component is set to zero at the factory because this setting is suitable for many ap-
plications.
Change the parameters in small steps only and monitor the effects on the system continu-
ously. Only a trained expert in the field of control engineering may carry out adjustment of
the parameter values.
Control component
P
I
D
Table 17: PID parameter
The sign for the P component determines the control's direction of control action.
Positive PID-Control (default):
If the P component is positive, the control system reacts to falling below the setpoint by in-
creasing the pump speed.
Negative PID-Control
If the P component is negative, the control system reacts to falling below the setpoint by re-
ducing the pump speed.
Factory setting
0.5
0.5 s
0 s
(= deactivated)
NOTICE
Possible malfunction in case of incorrect direction of control ac-
tion for PID control!
The pump runs only at minimum or maximum speed. It will not react to
changes in the parameter values.
• Check the controller's direction of control action.
Setting range Incrementation
-30.0 ... 2.0 0.1
-1.99 ... 0.01 0.01
0.00 ... 1.99 0.01
2.0 ... 30.0 0.1
10 ms ... 990 ms 10 ms
1 s ... 300 s 1 s
0 ms ... 990 ms 10 ms
1 s ... 300 s 1 s
en
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