Electrical Connection - Three-Phase Pumps Up To; Electrical Connection - Three-Phase Pumps, 11-22 Kw - Grundfos TPE Betriebshandbuch

NC C NO
0-10 V
0/4-20 mA 4-20 mA
0/1
B Y A 1 9 8 7
STOP
RUN
0/4-20 mA 0-10 V
10K
6 5 4 3 2
Fig. 5 Connection terminals - TPED
A galvanic separation must fulfil the requirements for reinforced
insulation including creepage distances and clearances specified
in EN 60335.

5.2 Electrical connection - three-phase pumps up to

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:
12
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N PE L
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
5.2.1 Preparation
Before connecting the E-pump to the mains, take the issues
illustrated in the figure below into consideration.
L1
ELCB
L2
L3
PE
Fig. 6 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 power
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
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 20.3 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
20.1 Supply voltage.
ELCB