Grundfos LFE Instrucciones De Instalación Y Funcionamiento página 40

17.3.11 Duty/standby
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. Install and prime the two pumps according to the installation
and operating instructions supplied with the pumps.
2. Check that the power supply is connected to the first pump
according to the installation and operating instructions.
3. Use Grundfos R100 to set the duty/standby to Not active in
the installation menu.
4. Use Grundfos R100 to set the Operating mode to Stop in the
operation menu.
5. Use Grundfos R100 to set the other displays as required for
the pump application (such as setpoint).
6. Disconnect the power supply to both pumps.
7. Installation of the AYB cable (91125604):
a. Remove the plug from each MLE terminal box with a flat
head screw driver. See fig. 36.
b. Screw a new cable gland into each MLE terminal box with a
crescent wrench. See fig. 36.
c. Loosen the new cable gland caps and push the cable ends
through the cable glands and into MLE motors.
d. Remove the AYB connector plug from the first MLE motor.
See fig. 37.
e. Connect the black wire to the A terminal of the AYB
connector plug.
f. Connect the orange wire to the Y terminal of the AYB
connector plug.
g. Connect the red wire to the B terminal of the AYB connector
plug.
h. Reconnect the AYB connector plug to the first MLE motor.
i. Tighten the cable gland cap to secure the cable. See fig.
36.
j. Repeat steps d to i for the second MLE motor.
8. Connect the power supply to the two pumps according to the
installation and operation instructions.
9. Use Grundfos R100 to check that the Operating mode is set to
Normal in the operation menu of the second pump.
10. Use Grundfos R100 to set the other displays as required for
the pump application (such as Setpoint).
11. Use Grundfos R100 to set the duty/standby to Active in the
installation menu of the second pump. Please note the second
pump will search for the first pump and automatically set the
duty/standby to Active in the installation menu.
12. The second pump will operate for the first 24 hours. The two
pumps will then alternate operation every 24 hours.
40
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Plug
Fig. 36 Removing the plug and connecting cable gland to the
terminal box
Fig. 37 AYB connector plug
PE
L3
L2
L1
Cable gland