Grundfos DDI 222 Instrucciones De Instalación Y Funcionamiento página 35

The assignment between the current signal and flow rate is
linear.
• With 0-20 mA current signal control, the curve for current input
and current output passes through Q = 0 at 0 mA and the
value pair Q (Q ) at 20 mA (curve 1a).
max. cal
• With 4-20 mA current signal control, the curve for current input
and current output passes through Q = 0 at 4 mA and the
value pair Q (Q ) at 20 mA (curve 2a).
max. cal
• With manual or contact control, the curve for current output
passes through Q = 0 at 4 mA and the value pair Q
at 20 mA (curve 2a).
The default setting for Q is the maximum dosing flow at
max.
default calibration at 3 bar.
Q [l/h]
50 l/h
40 l/h
30 l/h
20 l/h
10 l/h
0
Fig. 36 Current input and current output with default setting
9.9.1 Direct weighting of the current signal input and output
Weighting while the pump is running can be carried out in the first
function level. The currently set value increases or decreases for
the maximum flow rate Q (Q
max.
Q .
select mA max.
Setting the weighting
The parameters for 0-20 mA and for 4-20 mA are
independent of one another. The weighting
parameters are modified and saved according to the
Note
set operating mode.
Select the current control used (0-20 mA / 4-20 mA)
before weighting.
Weighting can be set independently of the current
input value that is currently set. The dosing flow
Note
value [l/h] that corresponds to the set current input
value [mA] always appears in the display.
1. When the pump is running or stopped, press and hold down
the "Up" button for approximately 5 seconds.
– "0-20 mA" or "4-20 mA", "Analog" and "l/h" flash in the
display.
2. Use the "Up" and "Down" buttons to increase or decrease the
currently set value for the maximum flow rate.
The curve for current input / current output now passes as
follows:
• With 0-20 mA (4-20 mA) current signal control, the curve for
current input and current output passes linearly through Q = 0
at 0 mA (4 mA) and the currently set value for the maximum
flow rate Q at 20 mA (curves 1b and 2b).
select max.
The set weighting is saved in the pump.
The values are retained, e.g. when the power supply
Note
is switched off, and are also active when current
weighting is called in the second function level.
(Q
max. cal
I / I 0-20 mA
1.. I in / I out 0-20 mA
in out
I 4-20 mA
in
2..
I 4-20 mA
in
I 4-20 mA, manual,
I 4-20 mA, manual,
out
out
contact
kontakt
0 mA 4 mA 8 mA
), or with weighting set value
cal
)
Q
Q
1a
2a
12 mA 16 mA 20 mA
I [mA]
I [mA]
in
in
default (Q )
default (Q )
max. cal
max kal
35