Grundfos TPE2 Notice D'installation Et De Fonctionnement page 54

17.51.2 Backup operation
Backup operation is possible with two pumps of same size and
type connected in parallel. Each pump requires a check valve in
series with the pump.
One pump is operating continuously. The backup pump is
operated for a short time each day to prevent seizing up. If the
duty pump stops due to a fault, the backup pump starts
automatically.
17.51.3 Cascade operation
Cascade operation ensures that the pump performance is
automatically adapted to the consumption by switching pumps on
or off. The system thus runs as energy-efficiently as possible with
a constant pressure and a limited number of pumps.
When a twin-head pump is running in constant pressure control
mode, the second pump head starts at 90 % and stops at 50 %
performance.
All pumps in operation run at equal speed. Pump changeover is
automatic and depends on energy, operating hours and fault.
Pump system:
• Twin-head pump.
• Two or four single-head pumps connected in parallel.
The pumps must be of the same type and size.
Each pump requires a non-return valve in series with the
pump.
Set the control mode to "Const. pressure" or "Const. curve".
This function is available with up to 4 motors installed in parallel.
The motors must be of the same size and 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 pressure 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 motors in the system have a sensor, they can all
function as master and take over the master function if the
other fails.
17.51.4 Sensor to be used
Define the sensor to be used for controlling the pump system. If a
sensor is placed in a way that it is able to measure the sensor
output from all pumps in the system, for example, in the manifold,
then select "Master pump sensor".
If a sensor is placed on, or across the individual pumps, for
example, installed behind non-return valves and not able to
measure the sensor output from all pumps, then select "Running
pump sensor".
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17.51.5 Setting a multipump system
You can set a multipump system in the following ways:
• Grundfos GO and wireless pump connection
• Grundfos GO and wired pump connection
• Advanced control panel and wireless pump connection
• Advanced control panel and wired pump connection
See step-by-step descriptions below.
Grundfos GO and wireless pump connection
1. Power on both pumps.
2. Establish contact to one of the pumps with Grundfos GO.
3. Set the needed analog and digital inputs via Grundfos GO
according to the connected equipment and the required
functionality. See section 17.48 Assisted pump
4. Assign a pump name to the pump using Grundfos GO. See
section 17.42 "Pump name".
5. Disconnect Grundfos GO from the pump.
6. Establish contact to the other pump.
7. Set the needed analog and digital inputs via Grundfos GO
according to the connected equipment and the required
functionality. See section 17.48 Assisted pump
8. Assign a pump name to the pump using Grundfos GO. See
section 17.42 "Pump name".
9. Select the "Assist" menu and "Multipump setup".
10. Select the desired multipump function. See sections
17.51.1 Alternating operation,
17.51.3 Cascade operation.
11. Press [>] to continue.
12. Set the time for pump changeover such as the time at which
the alternation between the two pumps is to take place. This
step applies only if you have selected "Alternating operation,
time" and if the pumps are fitted with FM 300.
13. Press [>] to continue.
14. Select "Radio" as the communication method to be used
between the two pumps.
15. Press [>] to continue.
16. Press "Select pump 2".
17. Select the pump from the list.
Use the [OK] or button to identify the pump.
18. Press [>] to continue.
19. Confirm the multipump setup by pressing [Send].
20. Press [Finish] in the "Setup complete" dialog box.
21. Wait for the green indicator light in the middle of Grundfos Eye
to light up.
The multipump system has now been set.
setup.
setup.
17.51.2 Backup operation and