English (GB)
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4.2 Preparations for starting up
4.2.1 Default settings
The pump is supplied from the factory with the
following default settings.
If one or more of the above parameters are to be
changed, use the optional CIU together with
Grundfos GO.
CIU can be connected temporarily for configuration.
If no CIU is available, the parameters can be
changed by means of Grundfos PC tool.
For further information, see installation and
operating instructions for CIU.
Fig. 6
Start and stop levels
4.2.2 Pump alternation
If up to four pumps are installed in the same pit, the
control logic incorporated in the pumps will ensure
that the load is distributed evenly among the pumps
over time.
Alternation is carried out according to a patented
method based on measurement of the liquid level in
the pit.
4.3 Start and stop levels
4.3.1 Setting the start level
The pump start level may be affected by the
barometric pressure. In the case of long intervals
between start and stop, the actual start level may
differ from the start level set. See examples below.
Example 1: Constant barometric pressure
The pump will start when the liquid level in the pit
has reached the set start level. Then the pump will
run until the liquid level reaches the stop level. When
it stops, the pump will calibrate itself in relation to the
actual barometric pressure. See fig.
.
Fig. 7
Example 1: Constant barometric
pressure
Example 2: Rising barometric pressure
If the barometric pressure rises after the pump has
stopped, the pump will register this rise as a rise in
liquid level. The result may be that the pump starts
before the set start level is reached. See fig.
Fig. 8
Example 2: Rising barometric pressure
Parameter
0.6 - 2.6 kW
Start delay, random
Off
Start level
25 cm
High-level alarm
+10 cm
Anti-seizing:
Interval
3 days
Duration
2 sec.
TM
06
59
0
2
03
16
The barometric pressure may affect the
alternating sequence.
Alarm
Start
Stop
TM
04
43
3
7
12
09
TM
04
433
8
120
9
Barometric pressure
Pump running
Start level set
Stop level
Barometric pressure
Pump running
Start level set
Stop level
