Setting The Control Mode - Wilo Stratos GIGA Serie Instrucciones De Instalación Y Funcionamiento

9.4

Setting the control mode

H
H
max
H
1
s
H
2 s
H
min
H
H
H
max
H
1
s
H
2
s
H
min
Fig. 43: p-c/ p-v control
H
H
n
max
H
s
n
min
Fig. 44: Manual control mode
Installation and operating instructions Wilo-Stratos GIGA
p-c/ p-v control:
Setting (Fig. 43)
1 Duty point on
maximum pump
curve
2
Duty point
within the con-
Q
trol range
Adjustment
range
Q
NOTE:
Q
Alternatively, manual control mode (Fig. 44) or PID operating mode
can also be set.
Manual control mode:
"Manual control" 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 motor.
PID control:
Q
Q
The PID controller in the pump is a standard PID controller, as
described in control engineering literature. The controller compares a
measured process value to a predefined setpoint and attempts to
adjust the process value to match the setpoint as closely as possible.
Provided appropriate sensors are used, a variety of control systems
(including pressure, differential pressure, temperature and flow con-
trol) can be realized.
When selecting a sensor, keep in mind the electrical values presented
in the table titled "Connection terminal allocation" on page 28.
The control behavior can be optimized by adjusting the P, I and D
parameters. The P (or proportional) term of the controller contributes
a linear gain of the deviation between the process (actual) value and
the setpoint to the controller output. The sign of the P term deter-
mines the controller's direction of action.
The I (or integral) term of the controller provides integral control
based on the system deviation. A constant deviation results in a linear
increase at the controller output. Hence a continuous system devia-
tion is avoided.
The D (or derivative) term responds directly to the rate of change of
the system deviation. This affects the rate at which the system
responds. In the factory settings, the D term is set to zero, since this
is an appropriate setting for a number of applications.
These parameters should only be changed in small increments, and
the effects on the system should be monitored continuously. Para-
p-c p-v
Draw from duty point Draw from duty point
towards the left. Read towards the left. Read
off setpoint H and set off setpoint H
S
the pump to this value. the pump to this value.
Draw from duty point Move to max. pump
towards the left. Read curve along control
off setpoint H and set curve, then horizontally
S
the pump to this value. to the left, read off set-
point H
pump to this value.
H , H H
min max min
see pump curves see pump curves
(in catalogue, select or (in catalogue, select or
online) online)
English
and set
S
and set the
S
, H
max
47