Grundfos DDI 222 Montage- Und Betriebsanleitung Seite 39

Menu
Info
P:OFF
bar
Menu
Info
Fig. 42 Set cut-off pressure
"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).
The actual cut-off pressure p
Note
set pressure p : p
set
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
Caution
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.
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.
Manual
1.210
flow
Fig. 43 Display: "Dosing controller"
P:on Stop
Up
Start
bar
Down
P:OFF
bar
Menu
Info
is higher than the
cut-off
= p + 0.5 bar.
cut-off set
l/h
Up
6.0
10.0
bar
bar
Down
Second function level
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
assignment .
The start-up operation is triggered as follows:
• By switching on the power supply.
• 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.
Manual
1.210
ERROR*
Fig. 44 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.
Stop
Start
9.7.1 Modifying the switch
l/h
flow*
39