Grundfos CU 301 Manuel D'instructions page 17

5.2.6 Operating hours and number of starts
Operating hours
The number of operating hours is accumulated from
the pump's birth and it cannot be reset.
The value
• is stored in the motor electronics, and it is kept
even if the CU 301 is replaced.
• is updated in the software every 2 minutes of con-
tinuous operation. The displayed value is updated
every two hours.
Number of starts
The number of starts is accumulated from the
pump's birth and it cannot be reset.
The value is stored in the motor electronics, and it is
kept even if the CU 301 is replaced.
5.3 Menu INSTALLATION
The INSTALLATION menu for the CU 301 offers the
possibility of configuring the CU 301, pump/motor
and sensor.
Factory settings are marked in bold-faced type
under each individual display.
5.3.1 Sensor
Make the following settings according to sensor type:
• Sensor output signal: "–" (not active), 0-20 mA,
4-20 mA, 0-10 V, 2-10 V.
• Setting range unit: bar, psi.
Setting range, psi:
• Minimum value: 0.
• Maximum value: 40-120 (40, 50, 60, 70 ... 120).
Setting range, bar:
• Minimum value: 0.
• Maximum value: 2-6 (2, 2.5, 3, 3.5 ... 6.0).
Note: The pressure sensor used must measure the
pressure in the actual measuring unit.
Relation to other displays
The measuring unit appearing in display 5.2.2 Actual
pressure will be identical to the measuring unit in the
front cover.
Exception: If "Manual" is selected in display
5.3.2 Choice of sensor, the sensor can be set, irre-
spective of the front cover.
If changes are made in display 5.3.1 Sensor, the set-
ting in display 5.3.2 Choice of sensor is changed to
"Manual".
If the original setting is resumed, it is necessary to
change the setting in display 5.3.2 Choice of sensor
from "Manual" to "Automatic".
5.3.2 Choice of sensor
The following settings are available:
• Automatic
• Manual.
Relation to other displays
If, for some reason, the setting in this display has
changed to "Manual" and this is changed to
"Automatic", the setting of the displays 5.3.1 Sensor
and 5.3.3 Maximum pressure setting will change to
the factory setting.
5.3.3 Maximum pressure setting
The setting of this display overrules the possibility of
using the arrow button on the CU 301 front to
increase the pressure to a setting above the
"Maximum pressure setting".
The following settings are available:
• 40-100 psi (10 psi intervals).
Relation to other displays
The setting of this display overrules the possibility of
using the display 5.1.1 Pressure setting to increase
the pressure to a setting above the "Maximum pres-
sure setting".
If the setting is changed from 100 psi, the setting in
display 5.3.2 Choice of sensor changes from
"Automatic" to "Manual".
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