Electrical Connection - Single-Phase Pumps; Preparation; Protection Against Electric Shock - Indirect Contact; Backup Fuses - Grundfos TPE 2000-Serie Installationsanleitung

5.1 Electrical connection – single-phase pumps
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:
Warning
( ( (
The surface of the terminal box may be above
___
) ) )
70 °C when the pump is operating.

5.1.1 Preparation

Before connecting the E-pump to the mains, take the issues
illustrated in the figure below into consideration.
N
ELCB
L
PE
Fig. 2 Mains-connected pump with mains switch, backup
fuse, additional protection and protective earthing
5.1.2 Protection against electric shock – indirect contact
Warning
The pump must be earthed and protected against
indirect contact in accordance with national
regulations.
Protective earth conductors must always have a yellow/green
(PE) or yellow/green/blue (PEN) colour marking.

5.1.3 Backup fuses

For recommended fuse sizes, see section 20.1 Supply voltage.

5.1.4 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
symbol:
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.
8
N
PE
L
ELCB

5.1.5 Motor protection

The pump requires no external motor protection. The motor
incorporates thermal protection against slow overloading and
blocking (IEC 34-11, TP 211).

5.1.6 Protection against mains voltage transients

The pump is protected against voltage transients by built-in
varistors between phase-neutral and phase-earth.

5.1.7 Supply voltage and mains

1 x 200-240 V, – 10 %/+ 10 %, 50/60 Hz, PE.
The supply voltage and frequency are marked on the pump
nameplate. Make sure that the motor is suitable for the electricity
supply of the installation site.
The wires in the terminal box must be as short as possible.
Excepted from this is the protective earth conductor which must
be so long that it is the last one to be disconnected in case the
cable is inadvertently pulled out of the cable entry.
Fig. 3 Mains connection
Cable glands
Cable glands comply with EN 50626.
2 x M16 cable gland, cable diameter ∅4-∅10
•
1 x M20 cable gland, cable diameter ∅10-∅14
•
• 1 knock out for M16 cable gland.
Warning
If the supply cable is damaged, it must be
replaced by qualified personnel.
Grid types
Single-phase E-pumps can be connected to all grid types.
Warning
Do not connect single-phase E-pumps to a mains
supply with a voltage between phase and earth of
more than 250 V.

5.1.8 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.
N
PE
L