Grundfos NBE Series - Electrical Connection and Protection; Electrical Supply Systems and Safety Protection

4.7.1 Drain holes
When the motor is installed in moist surroundings or areas with high
humidity, the bottom drain hole must be open. The enclosure class
of the motor will then be lower. This helps prevent condensation in
the motor as the motor becomes self-venting, and it allows water
and humid air to escape.
The motor has a plugged drain hole on the drive side. You can turn
the flange 90° to both sides or 180°.
B3 B14 B5
TM029037
Drain holes
4.8 Changing the position of the operating panel
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.
You can turn the operating panel 180°. Follow the instructions.
1. Loosen the four screws of the terminal box cover.
2. Remove the terminal box cover.
3. Press and hold in the two locking tabs (A) while gently lifting the
plastic cover (B).
A
A
B
TM084034
Lifting the plastic cover, shown on a Model J motor
4. Turn the plastic cover 180°.
Do not twist the cable more than 90°.
180°
TM084035
Turning the plastic cover, shown on a Model J motor
5. Position the plastic cover correctly over the four rubber pins (C).
Make sure that the locking tabs (A) are placed correctly.
A
A
C
TM084036
Positioning the plastic cover, shown on a Model J motor
6. Tighten the four screws with 3.7 ft⋅lb (5 Nm).
Make sure that the terminal box cover is aligned with
the orientation of the operating panel.
5. 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.
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.
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.
5.1 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
Model J:
The product is not suitable for use on corner earthed grids in
installations more than 6560 ft (2000 m) above sea level.
Model K:
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).
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English (US)