Menu Operation; Pressure Setting; Operating Mode; Alarm - Grundfos CU 301 Installer Manual

5.1 Menu OPERATION

The OPERATION menu for the CU 301 offers the
possibility of setting and reading operating parame-
ters.
Factory settings are marked in bold-faced type
under each individual display.

5.1.1 Pressure setting

Set the required pressure.
Setting range:
• 2.0-5.0 bar (0.5 bar intervals), 3.0 bar.
• 40-100 psi (10 psi intervals), 50 psi.
Relation to other displays:
The setting in display 5.1.1 Pressure setting is over-
ridden by the "Max." and "Min." settings in the dis-
plays 5.1.2 Operating mode and 5.3.3 Maximum
pressure setting.

5.1.2 Operating mode

Select one of the following operating modes:
• Max.
Pump operation is set to maximum speed, irre-
spective of the pressure setting. The maximum
speed is set in display 5.3.6 Maximum speed
(factory setting: 10,700 min
• Normal.
Normal operating mode, i.e. pump operation is
based on the pressure set in display 5.1.1 Pres-
sure setting.
• Min.
Pump operation is set to minimum speed,
-1
3,000 min , irrespective of the pressure setting.
• Stop.
The pump is stopped.
If the on/off button has been used to stop the pump,
this button must also be used for restarting.
Relation to other displays:
The "Max." and "Min." settings override the pressure
setting in display 5.1.1 Pressure setting.
14
-1
).

5.1.3 Alarm

This display shows the types of alarm that may
occur.
Possible alarms are described in the following table:
Alarm
Description
indication
No fault indica- No alarms are registered by
tion the CU 301.
No contact to No communication between
pump the CU 301 and the pump.
The supply voltage exceeds
Overvoltage
the limit value.
The supply voltage is below the
Undervoltage
limit value.
The dry-running protection of
Dry running
the pump has been activated.
Overtempera- The motor temperature ex-
ture ceeds the limit value.
The current consumption of the
Overload
motor exceeds the limit value.
The sensor signal has fallen
outside the measuring range
Sensor
set. The sensor signal of a
defective
4-20 mA or 2-10 V sensor is
below 2 mA or 1 V respectively.