You can choose between two alternating operating
modes:
• Alternating operation, time
The change from one pump or motor to the other
is based on time.
• Alternating operation, energy
The change from one pump or motor to the other
is based on energy consumption.
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.
9.54.1
Availability of cascade operation
Cascade operation is only available on request.
Contact Grundfos for further information.
9.54.2
Alternating operation, time
The Alternating operation, time menu sets the
interval of alternation between two pumps.
This setting is only available in alternating mode.
9.54.3
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.
9.54.4
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.
9.54.5 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.
9.54.5.1 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.
76
English (GB)
To Next Page
Loading...
Need help?
General
