Electrical Connection; Three-Phase Pumps, 3-10 Hp - Grundfos LFE Instrucciones De Instalación Y Funcionamiento

13. Electrical connection

For description of how to connect E-pumps electrically, see the
following sections:
13.1 Three-phase pumps, 3-10
13.2 Three-phase pumps, 15-30

13.1 Three-phase pumps, 3-10 hp

DANGER
Electric shock
Death or serious personal injury
- The user or the installer is responsible for the
installation of correct grounding and protection
according to current national and local standards.
- All operations must be carried out by qualified
personnel.
DANGER
Electric shock
Death or serious personal injury
- Disconnect all electric supply circuits and ensure
these have been switched off for at least 5 minutes
before making any connections in the pump
terminal box. For instance, the signal relay may be
connected to an external supply which is still
connected when the power supply is
disconnected.
The above warning is indicated on the motor
terminal box by this yellow label:
13.1.1 Preparation
Before connecting the E-pump to the power supply, take the
issues illustrated in the figure below into consideration.
L1
ELCB
L2
L3
PE
Power supply-connected pump with power switch,
Fig. 9
backup fuses, additional protection and protective
grounding
All manuals and user guides at all-guides.com
hp.
hp.
L1
L2
L3
13.1.2 Protection against electric shock - indirect contact
DANGER
Electric shock
Death or serious personal injury
- Ensure the pump is grounded in accordance with
national regulations. As the leakage current of 5-
10 hp (4-7.5 kW) motors is > 3.5 mA, take extra
precautions when grounding these motors.
EN 50178 and BS 7671 specify the following precautions when
leakage current > 3.5 mA:
• Install the pump in a stationary, permanent position.
• Connect the pump permanently to the power supply.
• Carry out the grounding connection as duplicate leads.
Mark the protective ground leads with a yellow/green (PE) or
yellow/green/blue (PEN) color marking.
13.1.3 Backup fuses
For recommended fuse sizes, see section
13.1.4 Additional protection
If the pump is connected to an electric installation where an
ground leakage circuit breaker (ELCB) is used as additional
protection, use a circuit breaker of a type marked with the
following symbols:
This circuit breaker is type B.
Take into account the total leakage current of all the electrical
equipment in the installation.
Check the leakage current of the motor in normal operation; see
section
28.1.3 Leakage current.
During start and at asymmetrical supply systems, the leakage
current can be higher than normal and may cause the ELCB to
trip.
13.1.5 Motor protection
The pump requires no external motor protection. The motor
incorporates thermal protection against slow overloading and
blocking (IEC 34-11, TP 211).
13.1.6 Protection against voltage transients
The pump is protected against voltage transients by built-in
varistors between the phases and between phases and ground.
28.1.1 Supply voltage.
ELCB
21