Start/Stop Of Pump; Connections - Grundfos CRE Installation And Operating Instructions Manual

Torques, terminals L1-L3:
Min. torque: 2.2 Nm
Max. torque: 2.8 Nm
Fig. 11 Mains connection
Cable glands
Cable glands comply with EN 50626.
1 x M40 cable gland, cable diameter ∅ 16- ∅ 28
•
1 x M20 cable gland, cable diameter ∅ 9- ∅ 17
•
2 x M16 cable gland, cable diameter ∅ 4- ∅ 10
•
• 2 x M16 knock-out cable entries.
Warning
If the supply cable is damaged, it must be
replaced by qualified personnel.
Grid types
Three-phase E-pumps can be connected to all grid types.
Warning
Do not connect three-phase E-pumps to a mains
supply with a voltage between phase and earth of
more than 440 V.

5.3.8 Start/stop of pump

The number of starts and stops via the mains
Caution
voltage must not exceed 4 times per hour.
When the pump is switched on via the mains, it will start after
approx. 5 seconds.
If a higher number of starts and stops is desired, use the input for
external start/stop when starting/stopping the pump.
When the pump is switched on via an external on/off switch, it will
start immediately.

5.3.9 Connections

If no external on/off switch is connected,
Note
connect terminals 2 and 3 using a short wire.
As a precaution, the wires to be connected to the following
connection groups must be separated from each other by
reinforced insulation in their entire lengths:
Group 1: Inputs
• start/stop terminals 2 and 3
• digital input terminals 1 and 9
• setpoint input terminals 4, 5 and 6
• sensor input terminals 7 and 8
• GENIbus terminals B, Y and A
All inputs (group 1) are internally separated from the mains-
conducting parts by reinforced insulation and galvanically
separated from other circuits.
All control terminals are supplied with protective extra-low
voltage (PELV), thus ensuring protection against electric
shock.
12
Group 2: Output (relay signal, terminals NC, C, NO).
The output (group 2) is galvanically separated from other
circuits. Therefore, the supply voltage or protective extra-low
voltage can be connected to the output as desired.
Group 3: Mains supply (terminals L1, L2, L3).
Fig. 12 Connection terminals
A galvanic separation must fulfil the requirements for reinforced
insulation including creepage distances and clearances specified
in EN 61800-5-1.
1: Digital input
9: GND (frame)
8: +24 V
7: Sensor input
B: RS-485B
Y: Screen
A: RS-485A
6: GND (frame)
5: +10 V
4: Setpoint input
3: GND (frame)
2: Start/stop