Grundfos CRE Series Installation And Operating Instructions Manual page 22

H
Low
Normal
Fig. 32 Three preconfigured flow limits, Low, Normal and High
10.3.10 Sensor
Without sensor
(uncontrolled)
The setting of the sensor is only relevant in the case of controlled
operation.
Select among the following values:
• Sensor output signal
0-10 V
0-20 mA
4-20 mA,
• Unit of measurement of sensor:
bar, mbar, m, kPa, psi, ft, m³/h, m³/s, l/s, gpm, °C, °F, %
• Sensor measuring range.
10.3.11 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. Install and prime the two pumps per the installation and
operating instructions included with the pumps.
2. Verify the power supply is connected to the first pump per the
installation and operating instructions.
3. Use the Grundfos R100 programmer to set the duty/standby
to "not active" in the installation menu.
22
High
With pressure sensor
(controlled)
DBP-1 - GRUNDFOS PUMP CRE - 99392005
4. Use the Grundfos R100 programmer to set the "operating
mode" to "stop" in the operation menu.
5. Use the Grundfos R100 programmer 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 casing with a flat head
screw driver (see fig. 33).
b. Thread a new cable gland into each MLE casing with a
crescent wrench (see fig. 33).
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. 34).
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 new cable gland cap to secure the cable (see
fig. 33).
j. Repeat steps "d" through "i" for the second MLE motor.
8. Connect the power supply to the two pumps per the
installation and operation instructions.
9. Use the Grundfos R100 programmer to verify the "operating
mode" is set to "normal" in the operation menu of the second
pump.
10. Use the Grundfos R100 programmer to set the other displays
as required for the pump application (such as "setpoint").
11. Use the Grundfos R100 programmer 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.
Plug
Fig. 33 Connecting cable gland to plug
PE
L3
L2
L1
Cable gland