Electrical Installation; Mains; Connection To Earth; Connection To Battery - Grundfos Fire NKF Series Installation And Operating Instructions Manual

7. Electrical installation

Warning
The electrical installation must be carried out by
an authorised staff in accordance with local
regulations and the wiring diagram in the control
cabinet.
Warning
Switch off the power supply before making
connections.
See installation and operating instructions for
Note
the controller.

7.1 Mains

Check that the supply voltage and frequency correspond to the
values stated on the nameplate of the control cabinet.
• Connect the control cabinet to a power supply which is
dimensioned to the fire pump set.
• Connect PE (protective earth) according to the installation and
operating instructions for the controller.
• Connect the signal cables between the start set and controller
according to the wiring diagram supplied with the product.
Note: If the start set is ordered as optional, the signal cables are
factory-fitted.

7.2 Connection to earth

The pump set must be connected to the main earth connection in
the electrical installation. The connection point is located in the
right lower corner of the base frame. See fig. 24, pos. 1.
1. Loosen and remove the nut and spring washer.
2. Mount an earth cable between the earth rod in the pump room
and the pump set.
3. Mount the spring washer and nut.
4. Tighten to 25 Nm.
Fig. 24 Earth connection

7.3 Connection to battery

Caution
12 V version
1. Connect the positive pole of battery 1.
2. Connect the negative pole of battery 1.
The positive pole is marked with red and the negative pole with
black. Proceed in the same way with battery 2. See fig. 25.
Fig. 25 Connecting the batteries (12 V version)
24 V version
One battery set consists of two batteries connected in series at
the factory.
1. Connect the positive pole of battery set 1.
2. Connect the negative pole of battery set 1.
The positive pole is marked with red and the negative pole with
black. Proceed in the same way with battery set 2. See fig. 26.
1
Fig. 26 Connecting the battery sets (24 V version)
Before connecting the battery set(s), switch off
the power supply by setting the main switch to
"O".
19