Connections; Electrical Connection - Three-Phase Pumps, 0.75 - 7.5 Kw; Preparation; Protection Against Electric Shock - Indirect Contact - Grundfos CRE Installation And Operating Instructions Manual

5.1.9 Connections

If no external on/off switch is connected, connect
Note
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.
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 N, PE, L).
NC C NO N PE L
0-10 V
0/4-20 mA 4-20 mA
0/1
1 9 8 7
STOP
RUN
0/4-20 mA 0-10 V
10K
6 5 4 3 2
Fig. 4 Connection terminals
A galvanic separation must fulfil the requirements for reinforced
insulation including creepage distances and clearances specified
in EN 60335.
1: Digital input
9: GND (frame)
8: +24 V
7: Sensor input
B: RS-485B
Y: Screen
B Y A
A: RS-485A
6: GND (frame)
5: +10 V
4: Setpoint input
3: GND (frame)
2: Start/stop
5.2 Electrical connection - three-phase pumps,
0.75 - 7.5 kW
Warning
The user or the installer is responsible for the
installation of correct earthing and protection
according to current national and local
standards. All operations must be carried out by
qualified personnel.
Warning
Never make any connections in the pump
terminal box unless all electric supply circuits
have been switched off for at least 5 minutes.
Note for instance that the signal relay may be
connected to an external supply which is still
connected when the mains supply is
disconnected.
The above warning is indicated on the motor terminal
box by this yellow label:

5.2.1 Preparation

Before connecting the E-pump to the mains, take the issues
illustrated in the figure below into consideration.
L1
L2 ELCB
L3
PE
Fig. 5 Mains-connected pump with mains switch, backup
fuses, additional protection and protective earthing

5.2.2 Protection against electric shock - indirect contact

Warning
The pump must be earthed in accordance with
national regulations.
As the leakage current of 4-7.5 kW motors is
> 3.5 mA, take extra precautions when earthing
these motors.
EN 50178 and BS 7671 specify the following precautions when
leakage current > 3.5 mA:
• The pump must be stationary and installed permanently.
• The pump must be permanently connected to the electricity
supply.
• The earth connection must be carried out as duplicate
conductors.
Protective earth conductors must always have a yellow/green
(PE) or yellow/green/blue (PEN) colour marking.

5.2.3 Backup fuses

For recommended fuse sizes, see section 21.1 Supply voltage.

5.2.4 Additional protection

If the pump is connected to an electric installation where an earth
leakage circuit breaker (ELCB) is used as additional protection,
the circuit breaker must be of a type marked with the following
symbols:
This circuit breaker is type B.
The total leakage current of all the electrical equipment in the
installation must be taken into account.
The leakage current of the motor in normal operation can be seen
in section 21.3 Leakage current.
During start and at asymmetrical supply systems, the leakage
current can be higher than normal and may cause the ELCB to
trip.
L1
L2
L3
ELCB
9