User Manual

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Siemens Desigo Desigo Room automation - Engineering, mounting and installation CM111043en_14
Smart Infrastructure DALI network 2020-10-30
14 DALI network
· The DALI network allows the PXC3 room automation station to communicate
with DALI ballasts and sensors.
· DALI is a two wire bus. The signal conductors can be in the same cable as the
AC 230 V power for the lights, or in a separate bus cable.
· The PXC3 possesses a DALI bus supply to power DALI devices.
Detailed information is available on the DALI homepage at www.dali-alliance.org.
14.1 Bus power supply
A bus power supply is required for bus communications.
PXC3 room automation stations each have switchable (via the ABT) bus supply.
They are switched on at the factory.
· Operation with an external power supply is NOT possible.
· An external power supply cannot be connected even if the internal power supply
is switched off.
· When the internal DALI bus power supply is switched off, the DALI interface of
the PXC3 is off too.
· DALI-2 ballasts may have an integrated bus power supply, which is enabled by
factory default. à Make sure to disable the integrated bus power supply of such
ballasts before connecting them to a PXC3.
· Guaranteed supply current 128 mA
· 64 addresses are supported for commercially available DALI ballasts
· As one ballast uses typically 2 mA, 64 ballasts can be connected
· Max. 16 lighting groups
· Input devices like sensors are not supported
· Guaranteed supply current 230 mA
Usable supply power: 190 mA (20% reserve for dynamic events!)
· 64 addresses are supported for commercially available DALI ballasts
· 63 addresses are supported for commercially available DALI-2 sensors
· As sensors use typically 5…15 mA, the power consumption of all
connected devices (incl. ballasts) may limit the max. number of devices on
a DALI line
· Max. 16 lighting groups
Examples for the number of admissible DALI-2 devices:
· 64 lights, no input devices
64 x 2 mA = 128 mA
· 14 groups of 4 lights each, each with 1 sensor
14 x (8mA + 5 mA) = 182 mA
· 10 groups of 4 lights each, each with 1 sensor
10 x (8mA + 10 mA) = 180 mA
Additional information
Supply is compulsory
Bus power supply
Notes
Number of devices
PXC3.ExxA
-
10
0A
Number of devices
PXC3.ExxA-200A
(DALI
-
2)