Grundfos CUE 150 hp Notice D'installation Et D'entretien page 31

10.7.7 Pump number (3.8)
This display shows the GENIbus number. A number between 1
and 199 can be allocated to the pump. In the case of bus
communication, a number must be allocated to each pump.
The factory setting is "–".
10.7.8 Digital inputs 2, 3 and 4 (3.9 to 3.11)
The digital inputs of the CUE (terminal 19, 32 and 33) can
individually be set to different functions.
Select one of the following functions:
• Min. (min. curve)
• Max. (max. curve)
• Ext. fault (external fault)
• Flow switch
• Alarm reset
• Dry running (from external sensor)
• Accumulated flow (pulse flow, only terminal 33)
• Not active.
The selected function is active when the digital input is activated
(closed contact). See also section 13.1 Digital inputs.
Min.
When the input is activated, the pump will operate according to
the min. curve.
Max.
When the input is activated, the pump will operate according to
the max. curve.
Ext. fault
When the input is activated, a timer will be started. If the input is
activated for more than 5 seconds, an external fault will be
indicated. If the input is deactivated, the fault condition will cease
and the pump can only be restarted manually by resetting the
fault indication.
Flow switch
When this function is selected, the pump will be stopped when a
connected flow switch detects low flow.
It is only possible to use this function if the pump is connected to
a pressure sensor or a level sensor, and the stop function is
activated. See sections 10.7.10 and 10.7.11.
Alarm reset
When the input has been activated, the alarm is reset if the cause
of the alarm no longer exists.
Dry running
When this function is selected, lack of inlet pressure or water
shortage can be detected. This requires the use of an accessory,
such as:
®
• a Grundfos Liqtec dry-running switch
• a pressure switch installed on the suction side of a pump
• a float switch installed on the suction side of a pump.
When lack of inlet pressure or water shortage (Dry running) is
detected, the pump will be stopped. The pump cannot restart as
long as the input is activated.
Restarts may be delayed by up to 30 minutes, depending on the
pump family.
Accumulated flow
When this function is set for digital input 4 and a pulse sensor is
connected to terminal 33, the accumulated flow can be
measured.
10.7.9 Digital flow input (3.12)
This display appears only if a flowmeter has been configured in
display 3.11.
The display is used for setting the volume for every pulse for the
function accumulated flow with a pulse sensor connected to
terminal 33.
Setting range:
• 0-265 gal/pulse (0-1000 litre/pulse).
The volume can be set in the unit selected in the start-up guide.
10.7.10 Constant pressure with stop function (3.13)
Settings
The stop function can be set to these values:
• Active
• Not active.
The on/off band can be set to these values:
ΔH is factory-set to 10 % of actual setpoint.
•
ΔH can be set within the range from 5 % to 30 % of the actual
•
setpoint.
Operating conditions for the stop function
It is only possible to use the stop function if the system
incorporates a pressure sensor, a check valve and a diaphragm
tank.
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