Grundfos CU 301 - CU 301 Operation Menu; Setting System Pressure; Selecting Operating Mode; Alarm Status Display

15
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
• 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
-1
).
• Normal
Normal operating mode, i.e. pump operation is
based on the pressure set in display
5.1.1 Pressure setting.
• Min.
Pump operation is set to minimum speed,
3,000 min
-1
, 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.
5.1.3 Alarm
This display shows the current alarm status.
Possible alarms are described in the following table:
* The pump will attempt to operate in on/off mode
starting at 7 psi below pressure setting and stop-
ping at 7 psi above pressure setting. The system
must be reset every 250 stops.
The R100 can retrieve the last five alarms that the
CU 301 experienced. They are displayed in order of
occurrence with "Alarm log 1" being the most recent.
TM CU301_1_01 US TM CU301_1_02 US
TM CU301_1_03 US
Alarm
indication
Description
No fault indica-
tion
No alarms are registered by
the CU 301.
No contact to
pump
No communication between
the CU 301 and the pump.*
Overvoltage
The supply voltage exceeds
the limit value.
Undervoltage
The supply voltage is below
the limit value.
Dry running
The dry-running protection of
the pump has been activated.
Overtemperature
The motor temperature exceeds
the limit value.
Overload
The current consumption of the
motor exceeds the limit value.
Sensor defective
The sensor signal has fallen out-
side the measuring range set.
The sensor signal of a
4-20 mA or 2-10 V sensor is
below 2 mA or 1 V respectively.
TM CU301_1_04 US