Grundfos DME Serie Instrucciones De Instalación Y Funcionamiento página 20

6.12 Analog
The pump is dosing according to an external analog
signal. The dosed quantity is proportional to the input
value in mA.
4-20 (default): 4 mA =
20 mA = 100 %.
20-4: 4 mA = 100 %.
20 mA =
0-20: 0 mA =
20 mA = 100 %.
20-0: 0 mA = 100 %.
20 mA =
See fig. 9.
The capacity limitation will influence the capacity.
100 % corresponds to the maximum capacity of the
pump or the set maximum capacity, see section
6.16 Capacity limitation.
The analog input requires a signal which is isolated
from frame. Min. resistance to frame: 50 kΩ
[%]
100
80
0-20 mA
60
40
20
0
0 4 8
Fig. 9
Value according to
analog signal
Fig. 10
If 4-20 mA or 20-4 mA is selected and the signal falls
below 2 mA, the pump will indicate a fault.
This situation occurs if the connection is interrupted,
for instance if the wire is damaged.
20
0 %.
0 %.
0 %.
0 %.
4-20 mA
12 16 20
[mA]
Change the analog mode as illustrated in fig. 11:
Use the buttons
for navigation
Fig. 11