7. Electrical connection
WARNING
Electric shock
Death or serious personal injury
‐ Switch off the power supply to the product including
the power supply for the signal relays. Wait at least 5
minutes before you make any connections in the
terminal box. Make sure that the power supply cannot
be switched on accidentally.
‐ Check that the supply voltage and frequency
correspond to the values stated on the nameplate.
‐ Connect the pump to an external power switch close
to the pump and to a motor-protective circuit breaker.
Make sure you can lock the power switch in OFF
position (isolated). Type and requirements as specified
in EN 60204-1, 5.3.2.
CAUTION
Sharp element
Minor or moderate personal injury
‐ When installing the wiring in the terminal box, wear
protective gloves to avoid cutting your hands on sharp
edges.
If the power cable is damaged, it must be replaced by the
manufacturer, the manufacturer's service partner or a
similarly qualified person.
The user or the installer is responsible for correct earthing
and protection according to local regulations.
All electrical connections must be carried out by qualified
persons.
Make sure to fill the pump with water before the power is
switched on. Follow the instructions for the pump.
Related information
2.1 Related instructions
7.1 Connecting an external switch
We recommend that you connect the product to an external switch.
1. Connect the switch via terminals 2 (DI1) and 6 (GND).
A jumper is added from factory.
2. Enable the External stop function.
Default setting from factory.
7.2
Power supply
DANGER
Electric shock
Death or serious personal injury
‐ Use the recommended fuse size.
7.2.1 Three-phase supply voltage
Three-phase motors are available for the voltages below:
• 3 x 440-480 V -10 % / +10 %, 60 Hz, PE
Check that the supply voltage and frequency correspond to the
values stated on the nameplate.
The wires in the motor terminal box must be as short as possible.
Excepted from this is the separated 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.
In order to avoid loose connections, make sure that you have
pressed home the terminal block for L1, L2 and L3 in its socket
when you connect the power cable.
For maximum backup fuse, see the section on supply voltage.
If you want to supply the motor through an IT network,
make sure that you have a suitable motor variant. If you
are in doubt, contact Grundfos.
Only the following motors can be supplied through an IT network:
• Motors with a speed of 2900-4000 rpm or 4000-5900 rpm and
up to 3 HP (2.2 kW).
Corner earthing is not allowed for supply voltages above 3
x 240 V and 3 x 480 V, 60 Hz.
TM078920
Example of a power supply-connected motor with a power switch,
backup fuses
TM053495
Power supply connection, three-phase motors
7.3 Electrical supply systems
Power supply network and earthing systems
If you want to supply the product through an IT network,
make sure that you have a suitable product variant. If you
are in doubt, contact Grundfos.
The internal EMC filter remains connected, and
subsequently no reduced leakage current variant is
available.
Supply line types
For applications in accordance with IEC 61800-5-1, the maximum
voltage to ground must not exceed 277 V.
The product is not suitable for use for corner earthed grids.
Maximum installation altitude: 11480 ft (3500 m).
• TN-S earthing system
• TN-C earthing system
• TN-C-S earthing system
• TT earthing system
7.4
Protection against electric shock, indirect contact
WARNING
Electric shock
Death or serious personal injury
‐ Connect the product to protective earth and provide
protection against indirect contact in accordance with
local regulations.
12
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