En
gl
is
h (
G
B)
58
"P:ON" in the display:
1. Press the "Start/Stop" button.
– The currently defined cut-off pressure is shown
in the display. The default value is the
maximum counter-pressure of the pump type +
1 bar (pumps < 10 bar) or + 2 bar (pumps from
10 bar and up).
2. Use the "Up" and "Down" buttons to enter the
desired cut-off pressure.
– You can set the cut-off pressure at which the
pump is to be stopped at around 2 bar up to
the default value.
•
Press the "Menu/Info" button (confirm the setting
and move on to the next menu item), or
•
press the "Start/Stop" button (confirm the setting
and close the second function level).
9.10.3 Dosing controller function
The pump software monitors the dosing process and
emits a pulse for each dosing stroke. For each
stroke, the "flow" display is momentarily turned off.
•
When switched on, the electronics detects
whether the dosing controller is activated.
– "flow" appears in the display.
Fig. 57
Display: "Dosing controller"
Suppression of dosing control function during
start-up operation
60 error strokes* are permitted during the start-up
operation before an error signal is emitted. After a
further 7 error strokes*, a dosing error is signalled.
* Default values, see also section
9.7.1 Modifying
the switch assignment
.
The start-up operation is triggered as follows:
•
By switching on the power voltage.
•
Deaeration operation (continuously pressing the
"Start/Stop" button).
The start-up operation is completed
•
after 60 strokes.
•
after the first valid stroke signalled by the dosing
controller.
•
after short switching on and off the pump by
pressing the "Start/Stop" button.
The number of permissible error strokes can be
increased or decreased since, depending on pump
type for example, 60 strokes may take a
considerable time during the start-up operation.
Dosing error (after start-up operation)
If, after seven successive strokes or after the number
of strokes which have been defined by the user, the
dosing controller does not emit a signal, this is
recognised as an error:
•
The error signal relay switches on, but the pump
is not switched off.
•
The LED flashes red.
•
"flow" and "ERROR" flash in the display.
Fig. 58
Display: "Dosing error"
Once the error has been corrected and seven valid
strokes have been measured or the "Start/Stop"
button has been pressed, the error signal relay
switches off.
•
The pump returns to the state it was in before the
error occurred.
9.10.4 Pressure control function
The pressure sensor monitors the pressure in the
dosing head. If the set pressure is exceeded by
0.5 bar, the pump switches off.
When switched on, the electronics detects whether
the chamber pressure control function is activated.
•
"bar" appears in the display.
Fig. 59
Display: "Pressure control"
Note
The actual cut-off pressure p
cut-off
is
higher than the set pressure
p
set
: p
cut-off
= p
set
+ 0.5 bar.
Caution
When you are setting the cut-off
pressure, be aware that the pressure
measured in the dosing head is higher
than the system pressure. It is
advisable to display the measured
pressure first, see section Displaying
the pressure that has been measured.
The set cut-off pressure should be
higher than the measured pressure in
the dosing head.
TM
03
65
74
45
06
1.210
flow
l/h
Manual
TM
03 65
76 450
6
Caution
To protect the pump and system
against excessive pressure build-up,
install an overflow valve in the
discharge line.
TM
0
3
6
577
4
506
1.210
flow*
ERROR*
l/h
Manual
1.210
bar
l/h
Manual
