Grundfos MAGNA3 D 32-80 180 97924451 [33/1656] Controller settings
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Grundfos MAGNA3 D 32-80 180 97924451 [33/1656] Controller settings

Grundfos MAGNA3 D 32-80 180 97924451 [33/1656] Controller settings
English (GB)
33
8.6.4 "Controller settings"
A change of the gain and integral-time values affects all control
modes. If you change the control mode to another control mode,
change the gain and integral-time values to the factory settings.
Factory settings for all other control modes:
The gain, K
p
, is equal to 1.
The integral time, T
i
, is equal to 8.
The table below shows the suggested controller settings:
If you use a built-in temperature sensor as one of the sensors,
you must install the pump as close as possible to the consumer.
1)
In heating systems, an increase in pump performance results
in a rise in temperature at the sensor.
2)
In cooling systems, an increase in pump performance results
in a drop in temperature at the sensor.
3)
Built-in temperature sensor.
L1: Distance in metres between pump and consumer.
L2: Distance in metres between consumer and sensor.
Guidelines for setting of PI controller
For most applications, the factory setting of the controller
constants, gain and integral time, ensures optimum pump
operation. However, in some applications an adjustment of the
controller may be required.
You find the setpoint displayed in figures 44 and 45. For further
information about setup, see the "Assist" menu in section
8.8.1 "
Assisted pump setup
".
Fig. 44 "Controller gain Kp"
Fig. 45 "Control. integr. action time Ti"
Proceed as follows:
1. Increase the gain until the motor becomes unstable. Instability
can be seen by observing if the measured value starts to
fluctuate. Furthermore, instability is audible as the motor
starts hunting up and down.
Some systems, such as temperature controls, are
slow-reacting, meaning that it may be several minutes before
the motor becomes unstable.
2. Set the gain to half the value of the value which made the
motor unstable.
3. Reduce the integral time until the motor becomes unstable.
4. Set the integral time to twice the value which made the motor
unstable.
Rules of thumb
If the controller is too slow-reacting, increase the gain.
If the controller is hunting or unstable, dampen the system by
reducing the gain or increasing the integral time.
Model A:
Use Grundfos GO to change the controller constants, gain and
integral time. You can only set positive values.
Model B and C:
Change the control settings by means of the display or Grundfos
GO. You can set both positive and negative values.
System/application
K
p
T
i
Heating
system
1)
Cooling
system
2)
0.5 - 0.5
10 + 5
(L
1
+ L
2
)
- 0.5
10 + 5
(L
1
+ L
2
)
0.5 - 0.5 30 + 5L
2
t
L2 [m]
Δt
L2 [m]
3)
L2 [m]
t
undef-079undef-080

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