Grundfos CUE Series Installation And Operating Instructions Manual page 28

10.7.12 Sensor 1 (3.15)
Setting of sensor 1 connected to terminal 54. This is the feedback
sensor.
Select among the following values:
• Sensor output signal:
0-20 mA
4-20 mA.
• Unit of measurement of sensor:
bar, mbar, m, kPa, psi, ft, m3/h, m3/s, l/s, gpm, °C, °F, %.
• Sensor measuring range.
10.7.13 Sensor 2 (3.16)
Setting of sensor 2 connected to an MCB 114 sensor input
module.
Select among the following values:
• Sensor output signal:
0-20 mA
4-20 mA.
• Unit of measurement of sensor:
bar, mbar, m, kPa, psi, ft, m3/h, m3/s, l/s, gpm, °C, °F, %.
• Sensor measuring range:
0-100 %.
10.7.14 Duty/standby (3.17)
Settings
The duty/standby function can be set to these values:
• Active
• Not active.
Min. speed
Fig. 42 Setting of the min. and max. curves in % of maximum performance
28
Pump-dependent speed range
Min.
Actual speed range
Min. speed, adjusted
Max. speed, adjusted
Activate the duty/standby function as follows:
1. Connect one of the pumps to the mains supply.
Set the duty/standby function to Not active.
Make the necessary settings in menu OPERATION and
INSTALLATION.
2. Set the operating mode to Stop in menu OPERATION.
3. Connect the other pump to the mains supply.
Make the necessary settings in menu OPERATION and
INSTALLATION.
Set the duty/standby function to Active.
The running pump will search for the other pump and
automatically set the duty/standby function of this pump to Active.
If it cannot find the other pump, a fault will be indicated.
The two pumps must be connected electrically
Note via the GENIbus, and nothing else must be
connected on the GENIbus.
The duty/standby function applies to two pumps connected in
parallel and controlled via GENIbus. Each pump must be
connected to its own CUE and sensor.
The primary targets of the function is the following:
• To start the standby pump if the duty pump is stopped due to
an alarm.
• To alternate the pumps at least every 24 hours.
10.7.15 Operating range (3.18)
How to set the operating range:
• Set the min. speed within the range from a pump-dependent
min. speed to the adjusted max. speed. The factory setting
depends on the pump family.
• Set the max. speed within the range from adjusted min. speed
to the pump-dependent maximum speed. The factory setting
will be equal to 100 %, i.e. the speed stated on the pump
nameplate.
The area between the min. and max. speed is the actual
operating range of the pump.
The operating range can be changed by the user within the
pump-dependent speed range.
For some pump families, oversynchronous operation (max. speed
above 100 %) will be possible. This requires an oversize motor to
deliver the shaft power required by the pump during
oversynchronous operation.
Nominal speed
Max.
100 %
Max. speed
Speed [%]