Setting Of Sensor; Duty/Standby; Setting Of Min. And Max. Curves; External Forced-Control Signals - Grundfos CRE Installation And Operating Instructions Manual

6.3.9 Setting of sensor

Without sensor
The setting of the sensor is only carried out in the case of
controlled operation.
Select the following:
• Sensor output signal (0-5 V (three-phase pumps, 11-22 kW,
only), 0-10 V, 0-20 mA or 4-20 mA),
• sensor measuring unit (bar, mbar, m, kPa, psi, ft, m³/h, m³/s,
l/s, gpm, °C, °F or %) and
• sensor measuring range.

6.3.10 Duty/standby

This function applies only to three-phase pumps
Note
up to 7.5 kW.
The duty/standby function applies to two pumps connected in
parallel and controlled via GENIbus.
The duty/standby function can be set to:
• Active,
• Not active.
When the function is active, the following applies:
• Only one pump is running at a time.
• The stopped pump (standby) will automatically be cut in if the
running pump (duty) becomes faulty. A fault will be indicated.
• Changeover between the duty pump and the standby pump
will take place every 24 hours.
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".
Using the R100, make the necessary settings in menu OPER-
ATION and INSTALLATION.
2. Set the operating mode to "Stop" in menu OPERATION.
3. Connect the other pump to the mains supply.
Using the R100, 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.
With pressure sensor

6.3.11 Setting of min. and max. curves

The operating range can be changed as follows:
• The max. curve can be adjusted within the range from
maximum performance (100 %) to min. curve.
• The min. curve can be adjusted within the range from max.
curve to 12 % of maximum performance. The pump has been
factory-set to 24 % of maximum performance.
• The operating range lies between the min. and max. curves.
H
100 %
Max. curve
Min. curve
12 %
Fig. 28 Setting of the min. and max. curves in % of maximum
performance

7. External forced-control signals

The pump has inputs for external signals for the forced-control
functions:
• Start/stop of pump.
• Digital function.

7.1 Start/stop input

Functional diagram: Start/stop input:
Start/stop (terminals 2 and 3)
H
H
Q
Normal duty
Q
Stop
Q
17