If the duty pump or motor fails, the other pump or motor starts.
Backup operation
Backup operation is possible with two motors of the same size and
type connected in parallel. One motor is operating continuously.
The backup motor is operated for a short time each day to prevent
seizing up. If the duty motor stops due to a fault, the backup motor
starts.
Cascade operation
This function is available with up to 4 motors installed in parallel.
The motors must be of the same size and if used with pumps, the
pumps must be of the same model.
• The performance is adjusted to the demand through cutting
pumps in or out and through parallel control of the pumps in
operation.
• The controller maintains a constant process value through
continuous adjustment of the speed of the pumps.
• Pump changeover is automatic and depends on load, operating
hours and fault detection.
• All pumps in operation run at the same speed.
• The number of pumps in operation also depends on the energy
consumption of the pumps. If only one pump is required, two
pumps will run at a lower speed if this results in a lower energy
consumption.
• If several pumps or motors in the system have a sensor, they
can all function as the master and take over the master function
if the other fails.
7.25.26.1
Alternating operation, time
The Alternating operation, time menu sets the interval of
alternation between two pumps.
This setting is only available in alternating mode.
7.25.26.2
Time for pump changeover
The Time for pump changeover menu sets the time of day for
pump changeover to take place.
This setting is only available in alternating operation.
7.25.26.3
Sensor to be used
This function defines the sensor to be used for controlling the pump
system.
Select Master pump sensor if the sensor is placed in a way where
it can measure the output from all the pumps in the system, for
example in the manifold.
Select Running pump sensor if the sensor is placed on or across
individual pumps. For example if the sensor is installed behind non-
return valves, and if it is not able to measure the output from all
pumps.
This setting is only available in alternating operation and cascade
operation.
7.25.26.4
Ways to set a multipump system
You can set a multipump system in the following ways:
• Grundfos GO and wireless motor connection.
• Grundfos GO and wired motor connection.
• HMI 300 or 301 operating panel and wireless motor connection.
• HMI 300 or 301 operating panel and wired motor connection.
Setting a multipump system with Grundfos GO and a wireless
motor connection
1. Power on both motors.
2. Establish contact to one of the motors with Grundfos GO.
3. Set the needed analog and digital inputs via Grundfos GO
according to the connected equipment and the required
functionality.
4. Assign a name to the motor using Grundfos GO.
5. Disconnect Grundfos GO from the motor.
6. Establish contact to the other motor.
7. Set the needed analog and digital inputs via Grundfos GO
according to the connected equipment and the required
functionality.
8. Assign a name to the motor using Grundfos GO.
9. Select the Assist menu and Setup of multi-pump system.
10. Select the desired multimotor function.
11. Press the Right button to continue.
12. Set the time at which the alternation between the two motors is
to take place.
This step applies only if you have selected
Alternating operation, time and if the motors are
fitted with FM310 or FM311.
13. Press the Right button to continue.
14. Select Radio as the communication method to be used between
the two motors.
15. Press the Right button to continue.
16. Select pump 2 (motor 2).
17. Select the pump from the list.
Use OK or the Radio communication button to
identify the pump.
18. Press the Right button to continue.
19. Confirm the setting by pressing Send.
20. When you have finished the setup and the dialog box
disappears, wait for the green indicator light in the middle of
Grundfos Eye to light up.
Setting a multipump system with Grundfos GO and a wired
motor connection
1. Connect the two motors with each other with a 3-core screened
cable between the GENIbus terminals A, Y, B.
2. Power on both motors.
3. Establish contact to one of the motors with Grundfos GO.
4. Set the required analog and digital inputs via Grundfos GO
according to the connected equipment and the required
functionality.
5. Assign a name to the motor using Grundfos GO.
6. Assign motor number 1 to the motor.
7. Disconnect Grundfos GO from the motor.
8. Establish contact to the other motor.
9. Set the analog and digital inputs according to the connected
equipment and the required functionality by means of Grundfos
GO.
10. Assign a name to the motor using Grundfos GO.
11. Assign motor number 2 to the motor.
12. Select the Assist menu and Setup of multi-pump system
(multimotor setup).
13. Select the desired multimotor function.
14. Press the Right button to continue.
62
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