Grundfos DMX 221 Manual Del Usuario página 22

Current signal control without weighting (default)
Current input and current output without weighting
[Strokes/min.]
f f
max.
max
f f
min.
min
0 mA 0
Fig. 28 Current signal/stroke frequency
The assignment between the current signal and stroke frequency
is linear by default between 0 and the maximum stroke frequency
(depending on pump type) for a current input signal of 0 mA to
20 mA (curve 1) or 4 mA to 20 mA (curve 2).
The current output corresponds to the following:
• curve 1 for current signal control 0-20 mA
• curve 2 for current signal control 4-20 mA and manual mode.
Current signal control with weighting
You can modify the pump response by setting a specific
assignment between the current input and stroke frequency.
In the second function level, first set the current value and then
the stroke frequency in the menu items for current weighting for a
reference point.
In the example, a stroke frequency of 60 1/min has been set for a
current input of 6 mA, see curve 3. The curve now passes
through 0 mA and the selected point. The maximum stroke
frequency of the pump must not be exceeded!
The current output applies to the maximum stroke
frequency of the pump (curve I
Note
the example.
22
4 mA 4 8 mA 8
), and is 10 mA in
out
1 2
12 mA 12 16 mA 16
[mA]
I
20 mA 20
out