Technical data

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Intelligent DALI DIM | Overview of dimmable control gears

2.6 Features and performance characteristics of the

digital interface

—

IEC 62386: This allows devices from different manufac-

turers to be combined. A special feature which should

be noted is that the manufacturers represented in the

DALI Group

are continuously expanding the tests de-

ﬁ ned as standard to guarantee high functional safety.

— Physical user data rate of 1200 bit/s enables a fail-safe

operation

— Safe interference voltage distance: Safe operation

is guaranteed as a result of the generously designed in-

terference voltage distance of the high and low levels.

— Data coding: The Manchester code is used; this allows

transmission errors to be recognized through its structure.

— Maximum system current: The maximum current that

a central interface supply

may deliver is 250 mA. Each

control gear may consume max. 2 mA. This must be

taken into account when selecting the interface supply.

— Limited system size: A maximum of 64 control gears

with an individual address can be differentiated in a system.

— Information feedback: ON/OFF, current brightness val-

ue of the connected lamps, lamp status etc. are possible.

— Control and supply lines can be laid together: A

minimum cross section of the line must be taken into

account. The maximum line length between two

connected system participants should not exceed

300 meters.

— Floating control input: The control input is galvanical-

ly separated from the mains voltage (basic insulation,

however, no safety extra-low voltage (SELV)).

Thus, the ECGs may be operated on different external

wires (phases).

— No termination resistors required: The interface

lines must not be completed with resistors.

— Dimming range 1 %-100 % (the lower limit

depends on the lamp and manufacturer): The pro-

gression of the characteristic line is standardized and

adjusted to eye sensitivity (logarithmic characteristic

line). An even impression of brightness results from

standardization when using control gears from different

manufacturers.

— Programmable dimming times: Special settings are

possible, such as the rate of changing the lighting level

(e.g. from 1 % to 100 % dimmer setting).

— Disruption of the data line: Deﬁ ned light settings are

automatically stored.

— Saving lighting scenes (different group-dependent

dimming conditions): Saving up to 16 scenes is pos-

sible.

— Connection to building management systems via

converter: The interface is primarily designed for room

applications; however, it can be integrated into the

building management systems via converters.

— Easy new system conﬁ guration: If the system is set

once and conﬁ gured, changes to the function of the

system, the lighting scene and the lighting functions are

only a matter of conﬁ guration and do not require any

changes to the hardware. Example: Regrouping lumi-

naires in a open-plan ofﬁ ce.

— Easy integration of new components. If an existing

lighting system is to be expanded, new components can

be added everywhere within the system. When doing

so, make sure that the system supply is sufﬁ ciently di-

mensioned.

— Polarity-free interface

2.7 Properties of the 1…10-V interface

Note

This chapter refers to OSRAM ECGs, models QTi DIM and

QT DIM, hereafter abbreviated as OSRAM DIM ECG.

— They are controlled via a fail-safe DC voltage signal of

10 V (maximum brightness; open control line) to 1 V

(minimum brightness; control line short-circuited).

— The control power is generated by the ECG

(max. current: 0.6 mA per ECG).

— The voltage on the control line is isolated from the mains

cable (basic insulation), however, without safety extra-

low voltage (SELV).

— ECGs can be dimmed in different phases via the same

control unit.

Note

The following must be observed due to the properties of

the 1…10-V interface:

— All control lines of an ECG installation must be connect-

ed with the correct polarity (+/–).

— The control line is insulated from the mains cable, how-

ever, without safety extra-low voltage (SELV). This

means that cables and terminals must be used for the

installation which are approved for 230 V.

— Using a resistor, the control voltage can easily be limited

up or down; several control units can be combined to-

gether.

5) Every ECG manufacturer that displays the DALI logo on the ECG is

a member of the DALI Group.

6) 40 command/s and 16 bit ➔ 640 bit/s

7) DALI interface on the control unit:

The DALI interface of the control unit also supplies the DALI inter-

face of the connected DALI components. So that the maximum per-

missible total current of 250 mA is not exceeded, no additional DALI

supplies or DALI control units may be connected in this system. In

order to not exceed the maximum permissible voltage drop of 2 V,

the cable cross section must be selected according to the table in

the technical data.