Grundfos CU 301 Notice D'installation Et De Fonctionnement page 18

5.3.9 Cut-in speed
In the case of an oversized pump or drastically
changing water levels, this function may cause an
excess pressure, at start-up, in relation to the
desired discharge pressure. The cut-in speed can
therefore be lowered to compensate.
Setting range: 3000 - 10,700 min
intervals).
Dry-running stop at reduced maximum pump
speed:
If the maximum pump speed has been reduced, the
dry-running stop value in display
must be changed.
stop
Calculating the minimum power limit:
If the pump is worn, a renewed calculation
of the minimum power limit may be
required.
The calculated value is used in the display
5.3.7 Dry-running
Step
Start the pump against closed outlet
1
valve.
Read the power input (P1) in the display
2
5.2.5 Power consumption.
Calculate the minimum power limit as
3
follows: Power limit [W] = P1 × 0.9.
Factory setting
-1
8200 min
5.3.10 Buttons on product
Disable the on/off button on CU 301 for protective
reasons.
You can set the on/off button to the following:
• "Active"
• "Not active".
Factory setting
"Active".
18
-1 -1
(100 min
5.3.7 Dry-running
stop.
Action
5.3.11 Number
Allocate a number to CU 301 and the pump
connected. CU 301 and the pump must have the
same number.
When allocating a number, the power
supply to other CU 301 units, if any, must
be switched off.
Setting range: "Not active", 1, 2, ....199.
Once a number setting is made, the factory setting
(not active) is no longer available.
If CU 301 and the pump do not have the same
number, the alarm "No contact" will be indicated.
Factory setting
"Not active".
5.3.12 Indicator lights
The indicator light setting can be changed in
Grundfos GO Remote.
Available settings:
• "Running lights" during pump operation (factory
setting).
• "Constant lights" during pump operation.
5.3.13 Store settings
Store the actual settings for later use.
5.3.14 Recall settings
Recall the last stored settings that the pump will then
use.
5.3.15 Undo
Undo previously made settings.
5.3.16 Unit configuration
Select between SI and US units. The setting can be
made generally for all parameters or customised for
each individual parameter.