0
10
15
20
[m]
[m
3
/h]
25
5 10 15 20 25 30
Qmin
Qopt
Qmax
169.0
Fig. 32: Variable Pressure process type
0
10
15
20
[m]
[m
3
/h]
25
5 10 15 20 25 30
Qmin
Qopt
Qmax
169.0
Fig. 33: Constant Pressure process type
0
10
15
20
[m]
[m
3
/h]
25
5 10 15 20 25 30
Qmin
Qopt
Qmax
169.0
Fig. 34: Constant Flow Rate process type
The Other Setpoint process type can be used to set other control modes such as level
control and differential temperature-dependent control.
Controller optimisation
Attenuation and response speed of the closed control loop can be optimised using
the PI Prop Gain
(3-9-1-2)
and PI Integral Tm
(3-9-1-3)
parameters.
When beginning to optimise the controller, the values for PI Prop Gain
(3-9-1-2)
and
PI Integral Tm
(3-9-1-3)
should only be adjusted in small increments.
Depending on its value, the proportional gain of the controller PI Prop Gain
(3-9-1-2)
has the following effect on the control characteristics:
▪ Low value selected for PI P Prop Gain
(3-9-1-2)
: Moderate controller response
speed and small overshoot
▪ Large value selected for PI P Prop Gain
(3-9-1-2)
: Faster controller response and
larger overshoot
7 Commissioning/shutdown
58 of 162
PumpDrive
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