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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
-1
).
• 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,
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 types of alarm that may
occur.
Possible alarms are described in the following table:
TM CU301_1_01 GBTM CU301_1_02 GB
TM CU301_1_03 GB
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.
Overtempera-
ture
The motor temperature ex-
ceeds the limit value.
Overload
The current consumption of the
motor exceeds the limit value.
Sensor
defective
The sensor signal has fallen
outside 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.
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