Menu Installation; Control Mode - Grundfos LFE Instrucciones De Instalación Y Funcionamiento

17.3 Menu INSTALLATION

17.3.1 Control mode

Without sensor
(uncontrolled)
Select one of the following
control modes (see fig. 24):
• Controlled
• Uncontrolled.
If the pump is connected to a bus, the control mode
cannot be selected via remote control. See section
22. Bus signal.
17.3.2 Controller
E-pumps have a factory default setting of gain (K
time (T ). However, if the factory setting is not the optimum
i
setting, the gain and the integral time can be changed in the
display below.
• The gain (K ) can be set within the range from 0.1 to 20.
p
• The integral time (T ) can be set within the range from 0.1 to
i
3600 s. If 3600 s is selected, the controller will function as a P
controller.
• Furthermore, it is possible to set the controller to inverse
control, meaning that if the setpoint is increased, the speed
will be reduced. In the case of inverse control, the gain (K
must be set within the range from -0.1 to -20.
The table below shows the suggested controller settings:
System/application
Heating
systems
p
L [ft]
1
p
p
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With pressure sensor
(controlled)
Select one of the following
control modes (see fig. 24):
• Controlled
• Uncontrolled.
) and integral
p
)
p
K
p
T
i
Cooling
1) 2)
systems
0.5 0.5
L < 16.4 ft:
1
0.5
L > 16.4 ft:
1
0.5
3
L > 32.8 ft:
1
5
0.5 0.5
System/application
Heating
systems
Q
0.5
t
L L [ft]
2
t
L [ft]
2
L [ft]
2
0.5
t
1)
Heating systems are systems in which an increase in pump
performance will result in a rise in temperature at the sensor.
2)
Cooling systems are systems in which an increase in pump
performance will result in a drop in temperature at the
sensor.
L = Distance in [ft] between pump and sensor
1
L = Distance in [ft] between heat exchanger and sensor
2
K
p
T
i
Cooling
1) 2)
systems
0.5 0.5
-0.5 10 + 1.5L
2
0.5 10 + 1.5L
2
-0.5 30 + 1.5L
2
+2.5 100
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