8
.3 Electrical connection
Electrical connections and work on electrical systems may only be carried out by authorised
electricians.
The relevant national and local regulations and standards must be complied with during assembly
and electrical installation.
The design of the ventilation unit complies with the safety requirements of the Equipment and Product Safety
Act and the applicable provisions of the EC Directives.
The
Safety notes under Section 2.2.3
–
Electrical connections
–
must be heeded when performing any
electrical work.
8
.3.1 Cable feed-throughs
To connect the mains cable, optional system components or external sensors, feed the cable through the PG
feed-throughs into the ventilation unit on the inspection side.
8
.3.2 Circuit diagram
The external system and extension components and the required temperature sensors must be
connected as per the electrical circuit diagram. Circuit diagrams are only available separately for
specialists.
8
.3.3 Mains connection
Unscrew and remove the protective cover for the electrical power unit to access the mains terminals.
Series LG 750 – 6000:
The
LG
ventilation unit is
not supplied ready to plug in
. The mains connection is provided by the
customer and – depending on unit size and subassemblies – must comply with the rated voltage
specified on the nameplate. Before working on the electrical power unit, the unit must be isolated
from mains and protected against renewed switch-on.
Series LG 750 - 6000 – cable colours:
Line conductor: all colours except green-yellow, yellow or multi-colour marking
conductor:
N-
light blue
PE conductor:
green/yellow
ATTENTION! Note the following before commissioning the plant:
1. All connections must comply with the local EVU
[electricity board]
provisions.
2. Check that all connecting and contact screws and unused connections are intact (may loosen during
transport).
3. Compare the mains voltage with the plant's connection voltage.
The nominal connection voltage is 400
V/50 Hz (three phase) or 230 V/50 Hz (single phase).
4. Do not lay control cables parallel to 230 V/400 V cables.
5. Only pulse and/or AC/DC sensitive residual current protective devices (type A or B) are permitted. When
switching on the unit’s voltage supply, pulse-shaped charging currents of the condensators in the EMC filter
may instantaneously trigger residual current protective devices. We recommend surge protectors with a
minimum triggering level of 300 mA and time-delay TRIGGER (super-resistant, characteristic K). Residual
current protective devices and frequency converters cannot guarantee operator protection during operation of
the unit.
O P E R A T I N G A N D I N S T A L L A T I O N I N S T R U C T I O N S L G
7 5 0 - L G 6 0 0 0
P A G E 4
2
