ProMinent DULCO flex Control Operating Instructions Manual page 48

'Menu'
Set up /
Error processing
Error processing
a)
F
max
P1
F1
F2
0 I 1 I 2
Fig. 31: Speed-current diagram for a) Lower side band, b) Upper side band
48
Fig. 30: Speed-current diagram for "Linear curve"
'Error message' menu item, you can activate error processing for
In the
these types of processing.
'Lower side band'
Using this type of processing, you can control a metering pump using the
current signal as shown in the diagram below.
However, you can also control two metering pumps for different feed
chemicals via a current signal (e.g. one acid pump and one alkali pump
using the signal of a pH sensor). To do this, connect the pumps electrically
in series.
'Error message' menu item, you can activate error processing for
In the
these types of processing.
P2
20 I [mA]
'Upper side band'
F
max
F2
P1
F1
0 I 1
Plot a diagram similar to the one above – with values for
(I1, F1) and (I2, F2) – so that you can set the pump as
desired!
The smallest processable difference between I1 and I2
is 4 mA (ll I1-I2 ll ≥4 mA).
b)
F
max
F2
F1
0
B0089
P2
I 2 I [mA]
20
B0088
P2
P1
I 1 I 2 I [mA]
20