Упрощенная HTML-версия
10.44
DALI
Simplified lighting planning with DALI at a glance
—
Simple planning
A single 2-wire control line for up to 64 devices means
that the lighting groups do not have to be assigned
at the planning stage. Instead, they can be simply set
up later with the aid of a controller. Planning of the
control line can be completely separate from planning
of the power supply.
—
Simple installation
The control line is protected against polarity reversal
and can be routed together with the power supply for
example in a 5-core sheathed cable. The control line
simply has to be rated for line voltage (basic insula-
tion). There is no need for special cable.
Neutral
Phase
DALI (DA)
DALI (DA)
Protective
earth
—
Requirements to be met by the transmission line
When choosing a cable, make sure that the voltage
drop on the line does not exceed 2 V at 250 mA. As
with 1-10 V systems, the power supply and the con-
trol line can be run in the same cable. This means for
example that a 5-core NYM cable can be used without
any problems at all to connect the DALI ECGs. The
maximum permitted length of cable between the con-
troller and the connected ECGs is 300 m.
Cross-section of the power cable:
A = L x I x 0.018
A = Cable cross-section in mm
2
,
L = Cable length in meters,
I = Maximum supply current in A,
0.018 = Specific resistance of copper
The following is used as a basis for finding the cable
cross-section (transmission and supply cable):
Cable length:
Up to
100 m
100 to
150 m
150 to
300 m
Cable cross-
section:
0.5 mm
2
0.75 mm
2
1.5 mm
2
Note
In view of the different technical characteristics of the
DALI interface in controllers available on the market,
and the different local conditions of the installation we
recommend restricting the cable length used in the
entire system to a maximum of 300 m.
—
Fewer components
No relays are needed for switching the luminaires.
Switching and dimming are handled exclusively via the
control line.
—
Flexible for a later change of use
With DALI, the lighting groups are not hard-wired. The
individual luminaires are grouped by simply assign-
ing them to groups with the aid of a controller. These
groupings can be changed at any time.
—
Synchronized changes from one lighting scene
to another
Even if different luminaires are started at different dim-
mer values or different types of lamp are combined
with one another, DALI changes from one lighting
scene to another in synchronism. All the light sources
reach the new light value at the same time.
—
Lamp status on request
As a means of detecting failed lamps, the lamp status
can be reported by a DALI device to the controller
and then displayed by the controller. This feature is of
particular benefit for major projects in which DALI can
be very easily integrated into existing bus systems via
gateways.