Wiring
3.3 DALI bus cable
ET 200SP Communication module CM 1xDALI (6ES7137-6CA00-0BU0)
16
Manual, 06/2019, A5E46959434-AA
3.3
DALI bus cable
Pay attention to the following requirements when you set up a DALI system.
Requirement for DALI cable
●
The voltage drop between the DALI power supply and any DALI device on the DALI bus
must be less than 2 V.
●
The cable length between DALI power supply and the DALI device should be less than
300 m. The recommend minimum-cross-section of the conductors depends on the cable
length.
Material
Cable length
Conductor cross section (Minimum)
Copper
< 100 m
0.5 mm
2
100 m to 150 m
0.75 mm
2
> 150 m
1.5 mm
2
Conductor cross section depending on the cable length
Note
It is not necessary to use special bus cables (twisted or shielded).
Maximum current permitted for integrated DALI power
When use the integrated DALI power, the DALI bus load ∑ I
DALI
cannot exceeds 160 mA.
You can calculate the DALI bus load with the following formula:
∑ I
DALI
= I
DALI_1
+ I
DALI_2
+ I
DALI_3
+ ... + I
DALI_n
∑ I
DALI
: Load of the DALI supply including all extension terminals
I
DALI_1
: Load of the first device on DALI bus
n: Total number of the devices on DALI bus
Example
You need to set up a DALI system with some control gears and sensors. At first, you add 64
control gears whose respective current consumption is 2 mA. Then you need to add a kind
of sensor whose respective current consumption is 5 mA.
The number of sensor you can add is:
(160 mA - 64 x 2 mA) / 5 mA = 6.4
So the maximum number of this kind sensor you can add in this DALI system is 6.