Maxima MPG Cod. EM00136006
rev. 1.1
26
−
Selecting the Upper Limit (see Fig. 27)
Once this mode and the lower limit (L) have been selected, when the Prog key is pressed the lower limit is stored
in memory and the letter
H
is displayed, followed by the upper limit (expressed in
mA
) for the current signal
(default 20.0) at which the pump runs at the maximum frequency set. This limit can be changed in 0,1 mA steps
by pushing the
▲
and
▼
keys.
WARNING:
before selecting the
L
and
H
limits check that actual current levels exiting the generator
used.
WARNING:
The minimum difference between the
L
and
H
limits is
1 mA
, with
H>L
.
If the pump receives a current that exceeds the
H
value it will dose at the maximum flow rate set.
However, the flow rate displayed will begins to flash indicating that the incoming current exceeds the
upper limit.
If the pump receives a current that is lower than the
L
value it will not dose. However, the flow rate
displayed will begin to flash indicating that the incoming current is below the lower limit.
WARNING:
The pump may stop automatically due to a pump cut-out signal emitted by the level
sensor (
Level
icon and
Alarm
LED lit), see par. 3.1.4 “Checking the level of the liquid to be dosed”.
−
Flow Control Function (see Fig. 27)
This can be enabled by pushing the
▲
or
▼
keys, and stored in the memory by pushing the
Prog
key.
Displaying and Operation
On exiting programming the flow rate for the input current signal will be displayed. This can be viewed in
percentage (
P
) or frequency (
F
) mode, which can be selected by holding the
Mode
key down.
The
0/4…20
icon stays on. When displayed as a percentage the
%
icon is also lit. The
STOP
icon must be off
while the pump is running.
The maximum dosage frequency can be changed by pushing the
Mode
key and
▲
or
▼
keys together.
EXAMPLE: Model MPG912 with limits set at L = 4,2 and H = 10,5.
If the pump runs at 100% (maximum frequency) the pump will stop when the input signal is at 4,2 mA or lower
and it will work at maximum frequency (240 strokes/min) for signals at 10,5 mA or higher.
If the percentage is set at 80% the pump will stop when the input signal is at 4,2 mA or lower and it will work at
the working frequency (0,8 x 240 strokes/min) for signals at 10,5 mA or higher.
