Rail-PSU-D4 User Guide
Overview
Page 4
DALI Connections
The Rail-PSU-D4 can be added to the DALI
circuit at any point (assuming the system has
been configured to the DALI specification).
The Rail-PSU-D4 can be put inline or joined
to the DALI circuit (see the diagrams on the
following page).
Either connector can be used for input or loop.
The connections are polarity-independent.
In a
DALI system, each circuit (of up to 64
ballasts) must have a DALI Bus PSU to
provide the voltage on the line.
Rail-PSU-D4 is a DALI Bus PSU with four
outputs (enabling it to power four DALI circuits).
It has two connections per output to facilitate
daisy chain connection, providing easy
installation into new or existing DALI systems.
Each output has a separate indicator LED
that indicates data transmit/receive and short
conditions.
Rail-PSU-D4 requires a 24 VDC power supply
(available for separate purchase).
Rail-PSU-D4 complements the Artistic
Licence product Rail-DMX-DALI, which allows
a DMX controller to command DALI ballasts.
Summary of Key Features
y
Four 16V, 250mA current-limited DALI
compliant power bus outputs
y
Short-circuit proof outputs
y
Outputs can be stacked to make one
16V, 1A current-limited power bus
y
Each output has two sets of connectors
to facilitate daisy chain connection
y
LED indicators show presence of DALI
activity, 24V input supply voltage and
DALI bus voltage
y
Fully accessible screw terminals for
easy connection
y
DIN Rail or surface mount
y
All outputs align with Rail-DMX-DALI
terminals
y
Rail-DMX-DALI and Rail-PSU-D4 can
be powered together by the same 24V
PSU
Power
Rail-PSU-D4 must be powered from
an external 24 VDC power supply. It is
recommended that a ferrite core be fitted onto
the DC power lines as close as possible to the
Rail-PSU-D4. This protects the unit from any
electrical spikes that appear on the DC line.
There are two power connections, either of
which can be used as input or loop. The loop
connection can be used to power additional
units or a Rail-DMX-DALI (subject to PSU
current rating).
DALI was primarily designed for commercial
lighting to respond to the growing demands
of energy efficient lighting systems. It was
DALI background
developed to provide two-way communication
between controller and ballasts.
The most common DALI device is a
fluorescent ballast. Compared to DMX512,
speed has been sacrificed in favour of
flexibility and ease of use.
Each DALI circuit must have a DALI Bus PSU
(such as Rail-PSU-D4 to provide the voltage
on the line). There can be no more than 64
ballasts on a single bus (this corresponds
to one circuit). Ballasts being used for the
first time require commissioning to give them
a unique short address. A tool such as the
Artistic Licence Dali-Scope can be used for
this.
For more information about DALI, please
refer to
www.DALI-ag.org
. A handy guide to
DALI for those more familiar with DMX can be
downloaded from
www.ArtisticLicence.com
.
