Operating Modes; Manual; Pulse; Analog - Grundfos DME 12 Montage- Und Betriebsanleitung

4.8 Operating modes

Note: The displayed l and ml values are only reliable
if the pump has been calibrated to the actual installa-
tion, see section 6.
The pump can run in five different operating modes:

• Manual

• Pulse

• Analog

• Timer (internal batch control)
• Batch (external batch control)
See description in the following sections.
4.9 Manual
The pump is dosing as constantly and evenly as pos-
sible, without any external signals.
Set the quantity to be dosed in l/h or ml/h. The pump
automatically changes over between the measuring
units.
Setting range:
DME 2: 2.5 ml/h - 2.5 (1.8*) l/h
DME 8: 7.5 ml/h - 7.5 (5.6*) l/h
DME 12: 12 ml/h -
DME 19: 18.5 ml/h - 18.5 (14.5*) l/h
DME 48: 48 ml/h - 48 (37*) l/h
* The figures in brackets indicate the maximum ca-
pacity when the anti-cavitation function is acti-
vated.
Fig. 6
Set value
4.10 Pulse
The pump is dosing according to an external pulse
signal, i.e. a water meter with pulse output or a con-
troller.
Set the quantity to be dosed per pulse in ml/pulse.
The pump adjusts its capacity according to two fac-
tors:
• Frequency of external pulses.
• The set quantity per pulse.
Setting range:
DME 2: 0.000018 ml/pulse - 5 ml/pulse
DME 8: 0.000069 ml/pulse - 15 ml/pulse
DME 12: 0.000111 ml/pulse - 24 ml/pulse
DME 19: 0.000204 ml/pulse - 37 ml/pulse
DME 48: 0.00530 ml/pulse - 96 ml/pulse
14
12 (9*) l/h
Fig. 7
Set quantity in
ml/pulse
Actual capacity
in ml/h or l/h
If the set quantity per pulse multiplied by the pulse
frequency exceeds the pump capacity, the pump will
run at maximum capacity. Excess pulses will be ig-
nored and the "actual capacity" display will flash.
4.11 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. 8.
The capacity limitation will influence the capacity.
100% corresponds to the maximum capacity of the
pump or the set maximum capacity, see section
4.15.
Fig. 8
[%]
100
80
0-20 mA
60
40
20
0
0 4 8
0%.
0%.
0%.
0%.
4-20 mA
12 16 20
[mA]