Maxima MPG Cod. EM00136006
rev. 1.1
25
3.2.5
Direct Current Proportional Mode (0/4…20)
In this mode the pump doses a proportional amount based on a 0/4—20 mA input signal, connected to PIN 11 (
-
pole) and PIN 13 (
+
pole).
the current at which the pump will dose can be set to its minimum (0 imp/min) and a current value that
corresponds to the pump dosing the maximum flow rate, equal to a flow rate established in the factory.
To select
0/4…20 Direct Current
mode, push the
Prog
key and hold it down. PrG appears on the screen for a
few seconds, and then the main programming menu will open (
STOP
icon flashing). Push the
▲
and
▼
keys
until the image I appears on the display, with the
0/4..20
icon flashing.
Setting parameters from the 0/4…20 menu.
From the main programming menu, when the
Prog
key is pressed the
0/4…20
icon stays lit and a specific menu
opens, as per the diagram shown below.
Fig. 27:
0/4…20 Direct Current Mode Menu
To exit Programming and save the parameters set at any time, hold the
Prog
key down for three seconds.
NOTE The limits
L = LOW
and
H = HIGH
refer to the pump’s functioning mode as follows:
L => Lower Limit: The pump doses at minimum frequency (0 strokes/minute)
H => Upper Limit: The pump doses at maximum frequency set.
−
Selecting the Lower Limit (see Fig. 27)
Once this mode has been selected, when the
Prog
key is pressed the letter
L
is displayed, followed by the lower
limit (expressed in
mA
) for the current signal (default 4.0) at which the pump runs at minimum frequency. This
limit can be changed in 0,1 mA steps by pushing the
▲
and
▼
keys.
l
Prog
L 4.0
Prog
Prog
0…19.0
Prog
H 20.0
1.0…20.0
Flow
on/off
Press
the key
Press the
key
Press
the key
Press
the key
Press
the
k
Press
the
Press
the keys
