Electrical Connection - Single-Phase Pumps; Mains Switch; Protection Against Electric Shock - Indirect Contact; Additional Protection - Grundfos LME Series Installation And Operating Instructions Manual

Fig. 1
For further installation, see installation and operating instructions
for the standard pump.
2.1 Electrical connection – single-phase pumps
Note: The user or the installer is responsible for the installation of
the correct earthing and protection according to valid national and
local standards. All operations must be carried out by a qualified
electrician.
Never make any connections in the pump terminal
box unless the electricity supply has been switched
off for at least 5 minutes.

2.1.1 Mains switch

The pump must be connected to an external all-pole mains switch
with a contact separation of at least 3 mm in each pole according
to IEC 364.
2.1.2 Protection against electric shock – indirect contact
The pump must be earthed and protected against
indirect contact in accordance with national regula-
tions.
Protective earth conductors must always have a yellow/green
(PE) or yellow/green/blue (PEN) colour marking.

2.1.3 Additional protection

If the pump is connected to an electric installation where an earth
leakage circuit breaker is used as additional protection, this cir-
cuit breaker must be marked with the following symbol:
Note: When an earth leakage circuit breaker is selected, the total
leakage current of all the electrical equipment in the installation
must be taken into account.
The leakage current of the pump can be found in section
12.2 Leakage current.

2.1.4 Motor protection

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

2.1.5 Overvoltage protection

The pump is overvoltage-protected through built-in varistors be-
tween phase-neutral and phase-earth.

2.1.6 Supply voltage

1 x 200-240 V ±10%, 50/60 Hz, PE.
The supply voltage and frequency are marked on the pump
nameplate. Please make sure that the motor is suitable for the
electricity supply on which it will be used.
The wires in the pump 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.
ELCB
Figure 2 shows an example of a mains-connected pump with
mains switch, back-up fuses and additional protection.
Fig. 2
MGE 71 and MGE 80
N
ELCB
Max. 10 A
L
PE
Actual mains connection is shown in figs. 3 and 4.
Fig. 3
MGE 71 and MGE 80
I
Fig. 4
TPED - MGE 71 and MGE 80
I

2.1.7 Start/stop of pump

The number of starts and stops via the mains voltage must not
exceed 4 times per hour.
When the pump is switched on via the mains, it will start after ap-
prox. 5 seconds.
If a higher number of starts and stops is desired, the input for ex-
ternal start/stop must be used when starting/stopping the pump.
When the pump is started/stopped via an external on/off switch, it
will start immediately.
N
PE
L
L
PE
N
L
PE
N
5