Duty/Standby (Only Three-Phase Pumps); Operating Range; Motor Bearing Monitoring (Only 11-22 Kw); Confirming Relubrication/Replacement Of Motor Bearings (Only 11-22 Kw) - Grundfos CRE Installation And Operating Instructions Manual

9.3.11 Duty/standby (only three-phase pumps)

The duty/standby function applies to two pumps connected in
parallel and controlled via GENIbus.
The duty/standby function can be set to these values:
• Active
• Not active.
When the function is set to 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) has a fault. 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
OPERATION 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.

9.3.12 Operating range

How to set the operating range:
• Set the min. curve within the range from max. curve to 12 % of
maximum performance. The pump has been factory-set to
24 % of maximum performance.
• Set the max. curve within the range from maximum
performance (100 %) to min. curve.
The area between the min. and max. curves is the operating
range.
H
100 %
Max. curve
Min. curve
12 %
Fig. 31 Setting of the min. and max. curves in % of maximum
performance

9.3.13 Motor bearing monitoring (only 11-22 kW)

The motor bearing monitoring function can be set to these values:
• Active
• Not active.
When the function is set to Active, a counter in the controller will
start counting the mileage of the bearings. See section
9.2.7 Lubrication status of motor bearings (only 11-22 kW).
Note
9.3.14 Confirming relubrication/replacement of motor
bearings (only 11-22 kW)
This function can be set to these values:
• Relubricated
• Replaced
• Nothing done.
When the bearing monitoring function is Active, the controller will
give a warning indication when the motor bearings are due to be
relubricated or replaced. See section 9.1.3 Fault indications.
When the motor bearings have been relubricated or replaced,
confirm this action in the above display by pressing "OK".
Note

9.3.15 Standstill heating (only 11-22 kW)

The standstill heating function can be set to these values:
• Active
• Not active.
When the function is set to Active, a DC voltage will be applied to
the motor windings. The applied DC voltage will ensure that
sufficient heat is generated to avoid condensation in the motor.
Q
The counter will continue counting even if the
function is switched to Not active, but a warning
will not be given when it is time for relubrication.
When the function is switched to Active again,
the accumulated mileage will again be used to
calculate the relubrication time.
Relubricated cannot be selected for a period of
time after confirming relubrication.
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