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Technical application guide

4DIMLT2 LED drivers

02/2015

Light is OSRAM

DALIDALIDALI StepDIM AstroDIM

PRESENCE

MainsDIM

CLO 6 kV(DIF)

8 kV(COM)

Ext. NTC

4DIMLT2 LED drivers | Contents

2

Contents

1 Introduction 03

1.1 OSRAM LED drivers with 4DIM functionality

for outdoor and industrial applications 03

1.2 4DIMLT2 product family 04

1.3 Nomenclature 06

1.4 Operating windows 06

1.4.1 Supported LEDs 07

1.4.2 Current foldback 07

2 Features 08

2.1 Operating current 08

2.1.1 Fixed current mode 08

2.1.2 LEDset2 mode 08

2.1.3 Tuning factor 10

2.2 Thermal derating and protection 10

2.2.1 External temperature sensor 10

2.2.2 Internal LED driver temperature protection 11

2.3 Constant lumen function 12

2.4 Lamp operating counter 12

2.5 End of life 12

2.6 OEM code 13

3 Operating modes 14

3.1 On/off operating mode 14

3.2 AstroDIM feature 15

3.2.1 Wiring and feature activation 15

3.2.2 Time-based mode 16

3.2.3 Astro-based mode 17

3.2.4 Presence detection in AstroDIM mode 20

3.3 StepDIM feature 21

3.3.1 StepDIM 22

3.3.2 StepDIM inverse 23

3.3.3 StepDIM inverse, autodetect 23

3.3.4 Mixed StepDIM installations with

3DIM and 4DIMLT2 LED drivers 24

3.4 MainsDIM feature 25

3.5 DALI operating mode 26

3.6 DC operation feature 27

4 Additional information 28

4.1 Insulation 28

4.2 Cable preparation 28

4.3 Incorrect wiring on the output side 29

4.4 Input overvoltage 29

4.5 Surge protection 29

5 Programming 30

Please note:All information in this guide has been prepared with great

care. OSRAM, however, does not accept liability for pos-

sible errors, changes and/or omissions. Please check

www.osram.com or contact your sales partner for an up-

dated copy of this guide. This technical application guide

is for information purposes only and aims to support you

in tackling the challenges and taking full advantage of all

opportunities the technology has to offer. Please note that

this guide is based on own measurements, tests, specifi c

parameters and assumptions. Individual applications may

not be covered and need different handling. Responsibility

and testing obligations remain with the luminaire manu-

facturer/OEM/application planner.

4DIMLT2 LED drivers | Introduction

3

1 Introduction

1.1 OSRAM LED drivers with 4DIM functionality for outdoor and industrial applicationsLong life, low maintenance costs and high effi ciency are

very important for outdoor and industrial applications.

OPTOTRONIC® LED drivers for outdoor applications meet

these requirements and unlock the full potential of LED-

based light sources.

Thanks to the high fl exibility of the programmable

OPTOTRONIC® 4DIMLT2 LED drivers, LED luminaire sys-

tems can be optimally adapted to the required conditions

and their cost can be optimized. With the four integrated

dimming functions (4DIM), signifi cant energy savings and

a reduction of greenhouse gas emissions can be achieved.

The standardized DALI interface allows for the simple inte-

gration into telemanagement systems (for example with the

OSRAM Street Light Control system) and also a harmo-

nized control of the output light level in contrast to a 0–10 V

interface. Moreover, these LED drivers already fulfi ll the new

stand-by requirements that will become effective in Europe

in 2016.

Due to the large operating window (voltage/current) of

these LED drivers, both OSRAM LED modules for outdoor

applications and customer-specifi c LED modules can be

operated. This also means that the overall amount of

different LED drivers on stock can be kept low and that

the overall complexity of luminaire maintenance over the

entire lifecycle can be reduced.

With the LEDset2 interface, OSRAM has created a new

path towards standardizing the communication between

LED driver and LED modules. LEDset2 ensures optimal

effi ciency, a high level of reliability and the adaptability of

the LED drivers to the latest LED technologies without

reprogramming.

Finally, the LED drivers with 4DIM functionality also set a

new standard with an integrated overvoltage protection

against common-mode surges up to 10 kV (single pulse)

for class I and II luminaires.

1) OT 40/120-277/1A0 4DIMLT2 E: Only allowed for single-phase systems with 277 VAC, suitable for three-phase systems with 220–240 VAC

2) Suitable for three-phase systems with 220–240 VAC


4

Table 1: Family overview

Product name OT 40/120-277/1A0 4DIMLT2 E

OT 60/170-240/1A0 4DIMLT2 E

OT 90/170-240/1A0 4DIMLT2 E

OT 165/170-240/1A0 4DIMLT2 E

General

Maximum power 40 W 60 W 90 W 165 W

Input voltage L/N 120 V, 220–240 V, 277 V 220–240 V 220–240 V 220–240 V

Input voltage SD/N 220–240 V, 277 V 1) 220–240 V 2) 220–240 V 2) 220–240 V 2)

Output current range 70–1050 mA 70–1050 mA 70–1050 mA 70–1050 mA

Insulation (primary/secondary)

SELV SELV Double Double

Insulation of casing

Double Double Double Double

Stand-by power

Dimming features

DALIDALIDALIDALI

0–10 V0-10 V

Not supported Not supported Not supported Not supported

StepDIM (SD)StepDIM

StepDIM inverse (SD)StepDIM

AstroDIM (astro-based)AstroDIM

AstroDIM (time-based)AstroDIM

MainsDIMMainsDIM

Presence detectionPRESENCE

Other features

Constant lumenCLO

Fit for SMART GRIDSMART

GRID

LEDset2

External NTCExt. NTC

Programming software

Tuner4TRONIC®

3DIM Tool Not supported Not supported Not supported Not supported

Note:The technical data of the OT 165/170-240/1A0 4DIMLT2 E

are preliminary. For design-in, please consult your OSRAM

sales contact.

1.2 4DIMLT2 product familyThe 4DIMLT2 product family consists of 4 different output

power classes up to 165 W. All 4 types have the same

4DIM dimming capabilities and the new multi-vendor

LEDset2 interface. They can be programmed via the

Tuner4TRONIC® software. The following overview shows

the main features of these new LED drivers.


5

DALI

DALIDALIDALI

Thanks to their DALI interface, the 4DIMLT2 LED drivers

can be integrated into telemanagement systems and oper-

ated with the OSRAM Street Light Control system. Bidirec-

tional communication and the query of status information

from the LED driver is also possible via DALI.

StepDIM/StepDIM inverse

StepDIM

Dimming via an external control phase: Predefi ned dimming

levels can be varied via the Tuner4TRONIC® software and

the polarity of the phase. The SD port also allows control

via a presence sensor powered by the mains.

AstroDIM/presence detection

AstroDIM

PRESENCE

Automatic dimming via an integrated timer (no real time

clock): 5 independent dimming levels and zones can be set

with the Tuner4TRONIC® software. Brightness variation is

possible in combination with an external presence sensor.

MainsDIM

MainsDIM

Dimming via mains voltage amplitude: This feature is often

used in combination with magnetic ballasts in outdoor

applications. The dimming behavior can be set via the

Tuner4TRONIC® software.

CLO (constant lumen output)

CLO

The decrease in the luminous fl ux of an LED module can be

compensated over its entire lifetime via a preprogrammed

current curve. This not only ensures stable lighting but also

saves energy and increases the lifetime of the LEDs.

Fit for SMART GRID

SMART

GRID

With this feature, the power consumption and operating

hours (resettable) of the LED module can be monitored.

Additional advantage: “Fit for SMART GRID” can also

provide better analysis of the lighting, thus ensuring safe

operation of the system.

LEDset2

The new generation LEDset2 is an improved LED module

interface for the combination of single or multiple LED

modules with one LED driver via a single analog control

line. This interface enables external current setting and

temperature monitoring. The LEDset2 interface has no

auxiliary supply and is not compatible with LEDset (1st

generation). LEDset2 has an absolute current coding, while

LEDset (1st generation) only has a relative one.

External temperature sensor

Ext. NTC

This feature allows the temperature protection of the LED

module or the complete luminaire in hot ambient tempera-

tures via an external sensor (e.g. NTC, negative tempera-

ture coeffi cient resistor). The derating can be modifi ed via

the Tuner4TRONIC® software.

Integrated overvoltage protection

6 kV(DIF)

8 kV(COM)

The 4DIMLT2 drivers have an integrated overvoltage

protection up to 6 kV for differential and 8 kV for common

mode overvoltages. They are also capable to withstand

one single 10 kV common mode pulse.

1) 30 V between 70 and 700 mA, 35 V between 700 and 1050 mA


6

1.3 NomenclatureThe product name of each OPTOTRONIC® 4DIMLT2 LED

driver is defi ned as shown below.

It is possible to operate the driver below the minimum

nominal current through initial setting of the output current.

Warning:When LED drivers are permanently operated below the

minimum nominal current, it is necessary to ensure compli-

ance with relevant IEC standards (for example mains cur-

rent distortion and power factor). Please consider that the

certifi cates are only valid within the nominal output current

range.

1.4 Operating windowsThe OPTOTRONIC® 4DIMLT2 LED driver family is split up

into 4 different power classes to provide the best suitable

power supply for different applications. The nominal output

current of 350–1050 mA is available in the following power

packages.

Figure 2 gives a complete overview of the possible

4DIMLT2 operating windows.

OT: OPTOTRONIC® LED driver

40: Power class: 40 W

120-277: Input voltage range (L/N): 120–277 V

1A0: Max. output current: 1050 mA

4DIM: 4DIM functionality (DALI, StepDIM,

AstroDIM, MainsDIM)

LT2: LEDset2 (LED module interface)

E: For exterior use under specifi c conditions

Figure 1: OT 40/120-277/1A0 4DIMLT2 E

Table 3: 4DIMLT2 operating range

Type Minimum dimming current

Minimumnominalcurrent

Maximumnominalcurrent

Minimumoutputvoltage

Maximumoutputvoltage

OT 40/120-277/1A0 4DIMLT2 E

70 mA 350 mA 1050 mA 18 V 56 V

OT 60/170-240/1A0 4DIMLT2 E

70 mA 350 mA 1050 mA 30/35 V 1) 115 V

OT 90/170-240/1A0 4DIMLT2 E

70 mA 350 mA 1050 mA 57 V 186 V

OT 165/170-240/1A0 4DIMLT2 E

70 mA 350 mA 1050 mA 90 V 285 V

Figure 2: Overview of 4DIMLT2 operating windows

1) For an input voltage of 170–190 VAC, the maximum allowed output

power is linearly limited to 85 % at 170 VAC starting from 100 % at

190 VAC

2) Ta > 55 °C only allowed for output current ≤ 700 mA

Table 2: 4DIMLT2 maximum allowed output power

Type Pmax Ta Vin (nominal)

OT 40/120-277/1A0 4DIMLT2 E

40 W

-40 –60 °C 220–240 VAC

-40 –55 °C 120/277 VAC

OT 60/170-240/1A0 4DIMLT2 E

60 W 1) -40 –55/60 °C 2) 220–240 VAC

OT 90/170-240/1A0 4DIMLT2 E

90 W 1) -40 –55 °C 220–240 VAC

OT 165/170-240/1A0 4DIMLT2 E

165 W 1) -40 –55 °C 220–240 VAC

Output current [A]

Output voltage [V]

0

40

80

120

160

200

240

280

0.2 0.4 0.6 0.8 1.0

OT 60 4DIMLT2 E

OT 40 4DIMLT2 E

Nominal range

OT 90 4DIMLT2 E

Dimming range

OT 165 4DIMLT2 E


7

Warning:The real number of supported LEDs needs to be checked

according to the minimum and maximum forward voltage

in the worst case conditions. They have to match the mini-

mum and maximum output voltage of the used LED drivers.

The forward voltage of the connected LED module in dim-

ming condition is lower than the forward voltage in nominal

condition but still has to be above the minimum output volt-

age of the LED driver.

1.4.2 Current foldbackThe intelligent 4DIMLT2 family allows a safe start-up of the

system if the power consumption or the total forward volt-

age of the LED module exceeds the maximum output pow-

er or voltage of the LED driver. In this case, the unit reduc-

es the current until the maximum output voltage [1] or

power [2] is not exceeded anymore. If no stable operating

point is achieved, the unit switches continuously on and off

or switches off completely.

Figure 3: Current foldback (example: OT 40 4DIMLT2 E)

1.4.1 Supported LEDsTable 4 shows how many LEDs can be driven with

one LED driver. The values are based on the following

assumptions:

VfLED = 3.1 V at 1050 mA and VfLED = 2.5 V at 70 mA

Table 4: Supported number of LEDs

Type Minimum numberof LEDs

Maximum numberof LEDs

OT 40/120-277/1A0 4DIMLT2 E

8 18

OT 60/170-240/1A0 4DIMLT2 E

12 37

OT 90/170-240/1A0 4DIMLT2 E

23 60

OT 165/170-240/1A0 4DIMLT2 E

36 90

Output current [A]

Output voltage [V]

0.2 0.4 0.6 0.8 1 1.20

10

20

30

40

50

1

2

4DIMLT2 LED drivers | Features

8

2 Features

2.1 Operating currentFlexible current setting allows taking advantage of the

continuously improving LED technology and building a

future-proof system. The 4DIMLT2 family offers two

modes for current setting, which can be set via the

Tuner4TRONIC® software:

— Fixed current: Current setting via programmable

interface

— LEDset2: Current setting via the LEDset2 interface

The factory default current is 700 mA without any resistor

connected to the LEDset2 interface. As soon as the LED

driver detects a resistor value for more than 3 seconds

within the valid resistor range of 2.37 kΩ (1050 mA) and

24.9 kΩ (200 mA), it switches to the LEDset2 mode.

2.1.1 Fixed current modeTo use the fi xed current mode, it has to be selected in the

Tuner4TRONIC® software. The minimum and maximum rat-

ed output currents are displayed according to the selected

LED driver. The output current of the LED driver can be set

by changing the value in the “Operating Current” fi eld.

It is possible to set a current lower than the minimum rated

current (see warning in chapter 1.4). This operating current

is indicated by a red number as shown in fi gure 5.

2.1.2 LEDset2 modeThe LEDset2 interface (LEDset 2nd generation) is a stan-

dardized LED module interface to set the right output current

and establish an easy and low-cost temperature protection

for the connected LED module. This multi-vendor interface

is suitable for LED modules connected in parallel or series.

Note:In the following fi gures, the LED module is displayed in a

simplifi ed way. The real number of LEDs depends on the

output voltage of the driver.Figure 4: Setting of operating current

Figure 6: LEDset2 parallel connection

Figure 7: LEDset2 series connectionFigure 5: Setting of a current lower than the minimum rated current

Luminaire 1

Rset Rset

NT

Cse

t

LE

Dse

t

SD

N LLE

D-

LE

D-

LE

D+

DA

DA

4DIMLT2 E

LED module LED module

Luminaire 1

Rset Rset

NT

Cse

t

LE

Dse

t

SD

N LLE

D-

LE

D-

LE

D+

DA

DA

4DIMLT2 E

LED module LED module


9

The output current of the LED driver can be set using an

externally connected resistor (min. power rating 50 mW,

max. tolerance 0.5 %). This provides the possibility to set

the LED current manually without the need for an additional

programming of the LED driver. With a resistor mounted on

the LED module as shown in fi gure 8, the correct LED cur-

rent can be set automatically. With this resistor, the desired

current for the LED module is set according to the used

LED bin and needed lumen output, offering a real plug-

and-play solution and making the system future-proof.

The LEDset2 coding for the 4DIMLT2 family is described

by the following graph.

For further details, please refer to the LEDset2

application guide, which can be downloaded at

www.osram.com\ledset.

Assuming a tuning factor of 100 %, the corresponding

output current can be calculated with the following formula

within the valid resistor range (Rset = 2.37–24.9 kΩ):

The undefi ned range should be avoided because the

output current of the LED driver is not predictable.

Table 5 gives an overview of commonly used current

values and the appropriate resistor values.To achieve a more accurate current setting, the second

LED- terminal of the LED driver can be used as shown in

fi gure 9. This increases the accuracy by roughly 0.5 %.

Figure 8: Rset connection

Figure 10: LEDset2 coding

Figure 9: Rset connection with higher accuracy

Table 5: LEDset2 resistor coding (tuning factor = 100 %)

Iout [mA]reference

Rset [kΩ][tolerance ≤ 0.5 %]

Iout [mA]nominal

Open circuit > 71 70

350 14.0 (E192) 357

500 10.0 (E192) 500

700 7.15 (E192) 699

1050 4.64 (E192) 1050

Undefi ned 0.9–2.37 1050/70

Short circuit < 0.9 70

Luminaire 1

Rset

NT

Cse

t

LE

Dse

t

SD

N LLE

D-

LE

D-

LE

D+

DA

DA

4DIMLT2 E

LED module

Luminaire 1

Rset

NT

Cse

t

LE

Dse

t

SD

N LLE

D-

LE

D-

LE

D+

DA

DA

4DIMLT2 E

LED module

I out [A] =5 V

x 1000Rset [Ω]

Rset [kΩ]

Output current [mA]

1 10 1000

200

400

600

800

1000

1

2

1 Undefi ned range 2 Nominal range


10

2.1.3 Tuning factorIn combination with the LEDset2 operating mode, the tun-

ing factor provides a real added value. To minimize the

number of LED module variants, the tuning factor can be

used to adapt the light output of standardized LED mod-

ules (e.g. Zhaga modules). The normalized luminous fl ux of

the module can be set to the required light output of the

application.

Output current [mA] = LEDset2 current [mA] x tuning factor [%]

Two different thermal protection modes can be selected in

the Tuner4TRONIC® software.

— Resistor-based mode (factory default)

— Temperature-based mode

Example:If 7000 lm are needed, a standardized 8000-lm LED mod-

ule can be used with a tuning factor of 87 % to achieve this

requirement. Every time the 8000-lm module is replaced

(also with a different default current), the current of the LED

driver (light output of the LED module) will be reduced by

87 % and the system is adapted to roughly 7000 lm. This

enables an easy replacement in the fi eld without repro-

gramming, while having a low number of LED module vari-

ants on stock.

Warning: In case the tuning factor is set higher than 100 %, the relia-

bility and safety of the module needs to be checked. In

case the set operating current multiplied with the tuning

factor exceeds the maximum nominal output current of the

LED driver, the LED driver will limit the output current to the

maximum nominal output current.

2.2 Thermal derating and protection

2.2.1 External temperature sensorBy connecting an external temperature sensor to the

NTCset terminal of the 4DIMLT2 LED driver, a very easy

and cost-effi cient temperature protection of the LED

module can be realized. As an example, an NTC (negative

temperature coeffi cient resistor) can be mounted on the

LED module and connected as shown in fi gure 12.

Figure 11: Tuning behavior

Figure 12: NTC connection

Luminaire 1

NT

Cse

t

LE

Dse

t

SD

N LLE

D-

LE

D-

LE

D+

DA

DA

4DIMLT2 E

LED module

NTC

Time

Time

Time

LEDset2 current

Output current

Tuning factor

700 mA

700 mA

1050 mA

1050 mA

150 %

500 mA

500 mA

100 %

500 mA

600 mA

120 %

350 mA

350 mA

50 %

0 mA

0 mA

0 %

1) Switch-on temperature in case the temperature has reached the

shut-off condition


11

Resistor-based modeThe resistor-based mode is activated by default. If the con-

nected resistor sensor value falls in the range between 6.3

and 5.0 kΩ, the output current is continuously lowered

down to 50 %. If the value falls further below 4.3 kΩ, the

output is switched off completely until the sensor reaches

5.0 kΩ again. The complete switch-off can be deactivated

by clicking on the “Shut Off” check box.

In this mode, a common NTC can be used to achieve a

fi xed thermal protection as shown in table 6. The specifi ed

temperatures can vary depending on the used NTC com-

ponent and the corresponding tolerances.

Temperature-based modeIn this mode, the derating behavior can be defi ned in tem-

perature values if one of the NTCs listed below is used.

The following value ranges are supported.

Warning:The derating level cannot fall below the minimum physical

dimming level of the LED driver, even if the software dis-

plays a lower value.

2.2.2 Internal LED driver temperature protectionThe 4DIMLT2 LED drivers also have a reversible internal

thermal protection. If the maximum Tc temperature is ex-

ceeded, the LED driver starts derating the output current

down to 30 %. If the temperature keeps increasing, the

LED driver switches off. It switches back on at the maxi-

mum allowed Tc temperature.

Note:To achieve the lifetime data of the driver, the luminaire

manufacturer needs to ensure that the maximum Tc

temperature is never exceeded.

After selecting the correct sensor type in the Tuner4TRONIC®

software, the favored temperature behavior can be pro-

grammed as shown in fi gure 13.

Table 6: Overview of standard NTCs

NTC type Start deratingtemperature[6.3 kΩ]

End derating temperature 1)

[5.0 kΩ]

Shut-offtemperature[4.3 kΩ]

22 kΩ 56 °C 62 °C 67 °C

33 kΩ 66 °C 72 °C 77 °C

47 kΩ 75 °C 83 °C 87 °C

68 kΩ 85 °C 92 °C 97 °C

Table 8: Supported value ranges

Parameter Min. Max. Increment

Resistor range 1.0 kΩ 25 kΩ 25 Ω

Temperature range 40 °C 95 °C 1 °C

Derating level 10 % 100 % 1 %

Table 7: Sensor types in temperature-based mode

Sensor types Code

Murata 10K NTC NCP18XH103J03RB

Murata 15K NTC NCP18XW153J03RB

Murata 15K NTC + 390 Ω NCP18XW153J03RB in series of 390 Ω

EPCOS B57423V2473Hxxx B57423V2473Hxxx

Figure 13: NTC programming

Figure 14: NTC sample behavior


12

2.3 Constant lumen functionOver the lifetime of an LED module, the light output drops

due to the aging process of the LEDs. To achieve a con-

stant light output of the module, the LED driver stores

the operating hours of the LED module and increases

the output current to react on the light output drop. To

set this feature according to the applied LED module, the

Tuner4TRONIC® software can be used, for example, as

shown in fi gures 15 and 16.

The exact values for programming the constant lumen

function for the connected LED module need to be ob-

tained from the corresponding LED supplier.

2.4 Lamp operating counterThe LED driver monitors the operating hours of the con-

nected LED module. In case of a fault of the LED driver or

module, the lamp operating time has to be (re)set accord-

ingly with the Tuner4TRONIC® software. The lamp operat-

ing time also has an infl uence on the constant lumen func-

tion and the “end of life” feature. It can be set using the

Tuner4TRONIC® software as shown in fi gure 18.

2.5 End of lifeThe LED driver can indicate that a preprogrammed lifetime

of the connected LED module is reached and the module

should be replaced. This function has to be activated in

advance via the Tuner4TRONIC® software. The “end of life”

indication can be programmed as shown in fi gure 19.

If the specifi ed lifetime is reached, the LED driver indicates

this through a lower light output during the fi rst 10 minutes

of the switch-on period as shown in fi gure 20.

The output levels have to be monotonically increasing from

the beginning to the end.

Warning:The output level is indicated as a red number if the level is

set higher than 100 %. In this case, the reliability and safety

of the module needs to be checked if the nominal operating

current is exceeded. It is not possible to achieve a higher

output current than the maximum nominal output current

of the LED driver.

The output level cannot fall below the minimum physical

dimming level of the LED driver, even if the software dis-

plays a lower value.

By clicking the “Savings” button, the estimated energy

savings are calculated as shown in fi gure 17. This value

is only an estimation because it does not consider, for

example, the LED VF behavior and effi ciency of the driver.

Figure 15: Constant lumen programming table

Figure 17: Constant lumen function – possible savings

Figure 18: Lamp operating time (10 kh)

Figure 19: End of life setting

Figure 16: Constant lumen programming graph (operating time = 10 kh)


13

Figure 20: “End of life” behavior without switch-on fade time

Figure 21: “End of life” behavior with long switch-on fade time

Figure 22: “End of life” behavior with short switch-on fade time

If a switch-on fade time is set, it is overriden by the “end of

life” functionality as described in fi gure 21. After 10 minutes,

the output current is set according to the current switch-on

fade time level.

Note:The “end of life” indication is deactivated in DC operation

until the next power-off/on cycle or DALI operation.

If the switch-on fade time is shorter than 10 minutes, the

output current is directly switched to the nominal output

level after the “end of life” indication as shown in fi gure 22.

Time Time

Time

Output level [%] Output level [%]

Output level [%]

Output current

Output current

Output current

10 minutes “endof life” indication



Switch-on fade time

Switch-on fade time

Minimumdimmingcurrent



2.6 OEM codeBy entering the OEM code, the following features of the

4DIMLT2 drivers can be protected:

— Constant lumen

— Operating current

— Thermal protection

By factory default, the drivers are not protected by the

OEM code. Once it is entered, the confi guration can

only be reprogrammed with the same OEM code. The

valid OEM code range is from 0001 to 9999. 0000 is

reserved to indicate a non-protected device. The protection

can be deactivated in the special rework mode of the

Tuner4TRONIC® software with a Tuner4TRONIC® pro-

duction fi le containing no OEM code.

4DIMLT2 LED drivers | Operating modes

14

3 Operating modes

The operating modes of a 4DIMLT2 LED driver can be

selected using the Tuner4TRONIC® software.

3.1 On/off operating modeThe 4DIMLT2 LED drivers can also be used in a simple

on/off operating mode. One of the following dimming

modes needs to be selected:

— StepDIM/AstroDIM/DALI (wiring selection) –

DALI and SD port not connected

— StepDIM (DALI) – DALI and SD port not connected

— DALI – DALI port not connected

Note:Be aware that the parameters set in these operating modes

also have an infl uence on the behavior of the LED driver in

the on/off operating mode.

Note:DALI always has a higher priority than the selected operat-

ing mode and can be activated by a valid DALI command in

every mode. After a power-off/on cycle, the LED driver op-

erates in the originally selected dimming mode again.

The LED driver offers the possibility to select one of the

two dimming modes “StepDIM (DALI)” or “AstroDIM (DALI)”

via external wiring in case the default dimming mode “Step-

DIM/AstroDIM/DALI (wiring selection)” is set. Please refer to

chapter 3.2.1 for wiring information.

Figure 23: Operating/dimming mode

Figure 24: Wiring for on/off operation

LE

D m

od

ule

S1

LE

D m

od

ule

Luminaire 1 Luminaire 2

NT

Cse

t

NT

Cse

t

LE

Dse

t

LE

Dse

t

SD

SD

N NL LLE

D-

LE

D-

LE

D-

LE

D-

LE

D+

LE

D+

DA

DA

DA

DA

4DIMLT2 E 4DIMLT2 E

Switching cabinet

PE

L1

N


15

3.2 AstroDIM featureThe AstroDIM feature allows an autonomous dimming with-

out the need for an additional control line. The 4DIMLT2

LED drivers support up to 5 independent dimming levels

and fl exible settings of fade times between the single

dimming levels.

The output levels can be set to 0 % (OFF) or between 10 %

and 100 % in steps of 1 %.

In addition, switch-on and switch-off fade times can be

programmed at the beginning and the end of a switching

cycle to allow for further energy savings during the twilight

phase. This function is also helpful for installations with a

pedestrian crossing where no specifi c infrastructure is

available to switch the pedestrian crossing illumination

independently of the rest of the street light illumination.

Two different modes for AstroDIM are supported:

Time-based: The dimming profi le de-

fi ned in the reference schedule is refer-

enced to the switch-on time of the LED

driver.

Astro-based: The dimming profi le de-

fi ned in the reference schedule is refer-

enced to the annual average middle of

the night, which is calculated based on

the theoretical sunrise and sunset times.

The LED driver does not have a real time clock. The internal

reference clock is derived from the mains frequency and

the driver detects if it is connected to a 50 Hz or 60 Hz

supply system, assuming a time base of 20 ms or 16.6 ms.

This allows a synchronized switching of all units. In case

of DC operation (see chapter 3.6), the dimming mode is

stopped until the AC voltage is applied again and a power-

off/on cycle is performed.

Warning: If the output level is set below the minimum physical dimming

level of the LED driver (except OFF), the minimum dimming

current is used. The software still displays the original value.

3.2.1 Wiring and feature activationThere are two ways to activate the AstroDIM mode:

— Option 1: By external wiring

Selected dimming mode (factory default):

“StepDIM/AstroDIM/DALI (wiring selection)”

— Option 2: Via the Tuner4TRONIC® software

Selected dimming mode: “AstroDIM (DALI)” or

“AstroDIM PD (DALI)”

For option 1, the AstroDIM feature is activated without the

need for programming. Only a permanent connection between

the L and the SD port of the LED driver is necessary (see

fi gure 25). If the SD port is not active during the start-up

phase of the LED driver (for 1 s), the StepDIM feature is

activated instead of the AstroDIM feature. Information on

the default dimming profi le can be found in the datasheet

of the used LED driver.

For option 2, the external wiring can be avoided if either the

“AstroDIM (DALI)” or “AstroDIM PD (DALI)” dimming mode is

selected via the software (see fi gure 26).

Figure 25: Wiring: StepDIM/AstroDIM/DALI (wiring selection)

LE

D m

od

ule

S1

LE

D m

od

ule


NT

Cse

t

NT

Cse

t

LE

Dse

t

LE

Dse

t

SD

SD

N NL LLE

D-

LE

D-

LE

D-

LE

D-

LE

D+

LE

D+

DA

DA

DA

DA

4DIMLT2 E 4DIMLT2 E

Switching cabinet

PE

L1

N


16

3.2.2 Time-based modeIn this mode, the LED driver performs the dimming profi le

defi ned in the reference schedule based on the switch-on

time of the unit. 5 independent output levels can be set for

each step. The minimum length of one dimming period has

to be longer than the AstroDIM fade time. The maximum

duration of the schedule is 23 h and 59 min. If less than 5

output levels should be performed, two sequenced levels

have to be set to the same value. The AstroDIM dimming

profi le in the time-based mode already starts after the fi rst

power-off/on cycle after programming.

Figure 26: Wiring: AstroDIM (DALI) or AstroDIM PD (DALI)

Figure 27: Time-based AstroDIM

Fade timing:

— AstroDIM fade time: Fade time between the different

dimming levels.

— Switch-on fade time: Fade time after the power-on

of the LED driver. The output level at the end of this fade

time is defi ned by the output level of the related dim-

ming period.

Table 9: Fade timing parameters (time-based mode)

Parameter Min. Max. Default

AstroDIM fade time 0, 2 s 8 min 3 min

Switch-on fade time 0, 15 s 60 min 0 s

LE

D m

od

ule

S1

LE

D m

od

ule


NT

Cse

t

NT

Cse

t

LE

Dse

t

LE

Dse

t

SD

SD

N NL LLE

D-

LE

D-

LE

D-

LE

D-

LE

D+

LE

D+

DA

DA

DA

DA

4DIMLT2 E 4DIMLT2 E

Switching cabinet

PE

L1

N


17

Fade timing:

— AstroDIM fade time: Fade time between the different

dimming levels.

To achieve further energy savings in the twilight phase, the

switch-on and switch-off fade time can be set to up to 60

minutes.

— Switch-on fade time: Fade time after the LED driver

has been powered on. The output level at the end of

this fade time is defi ned by the output level of the related

dimming period (step x).

— Switch-off fade time: Fade time prior to the estimated

power-off point. The switch-off fading is performed

down to the minimum dimming current until the LED

driver is switched off externally.

The “schedule by day” in the AstroDIM feature tab calcu-

lates the estimated dimming behavior for a specifi c day

based on the theoretical sunrise and sunset times. If day-

light saving should be considered, the check box needs

to be ticked. The LED driver itself is not able to detect

summer and winter time and does not have an internal

real time clock.

In case the installation is not powered on and off at the

calculated sunrise and sunset times, the correct values

can be entered in the manual mode as shown in fi gure 29.

The AstroDIM function in astro-based mode relies on an

intelligent algorithm. It starts after the fi rst valid night and

reaches its maximum precision after 8 valid days. A valid

on-time is defi ned if the duration of the operation is longer

than 4 hours and shorter than 24 hours.

Table 10: Fade timing parameters (astro-based mode)


AstroDIM fade time 0, 2 s 8 min 3 min


Switch-off fade time OFF, 0 s 60 min OFF

3.2.3 Astro-based modeIn this mode, the LED driver performs a dimming profi le

based on the daily power-on and power-off times. The

dimming schedule is adapted according to the length of

the night.

The Tuner4TRONIC® software calculates the annual aver-

age middle of the night based on the theoretical sunrise

and sunset times, which are related to the location selected

in the software. Based on this average middle of the night,

5 independent dimming periods can be defi ned in the refer-

ence schedule. The minimum length of one dimming period

has to be longer than the AstroDIM fade time. Valid time

values can be set between 12:00 pm and 11:59 am. If less

than 5 output levels should be performed, two sequenced

levels have to be set to the same value.

The defi ned dimming profi le is already performed after the

second power-off/on cycle after programming.

Figure 28: Astro-based AstroDIM

Figure 29: Schedule by day


18

Voltage dips of less than 100 ms do not affect the

on-time (case B).

If the on-time of the LED driver is shorter than 4 hours, it

is not saved and therefore not used to calculate the next

on-time (case C).

The AstroDIM profi le is performed after the fi rst valid

on-time.

Figure 30: Use cases of AstroDIM mode

Case A

Case B

Case C

1

1

1

Night 1

Night 1

Night 1

Firstpower-on

Short voltage dips (< 100 ms)

Time

Time

Time

Time

Time

Time

Outp

ut

level %

Outp

ut

level %

Outp

ut

level %

Main

sM

ain

sM

ain

s

On

On

On

Off

Off

Off

Night 2

Night 2

Night 2

Day 2

Day 2

Day 2

Day 1

Day 1

Day 1

2

2

2

3

3

3

4

4

4

5

5

5

1 2 3 4

1

5

21


19

If the on-time of the LED driver is longer than 24 hours, it is

not saved and therefore not used to calculate the next on-

time.

Note:If the 4DIMLT2 LED driver is operated longer than 24 hours,

it cannot be assumed that the different dimming level will

start at the same time, because the time base is affected

by the accuracy of the mains frequency over the day, week,

month and year.

Without switch-off fade time:

With enabled switch-off fade time:

Case D

Case E

1

1

1

1

1

1

Night 1

Night 1

Time

Time

Time

Time

Outp

ut

level %

Outp

ut

level %

Main

sM

ain

s

On

On

Off

Off

Night 2

Night 2

Night 3

Night 3

Night 4

Night 4

24 h

24 h

24 h

24 h

24 h

24 h

Day 1

Day 1

2

2

2

2

2

2

3

3

3

3

3

3

4

4

4

4

4

4

5

5

5

5

5

5

1

1

2

2

3

3

4

4

5

5


20

3.2.4 Presence detection in AstroDIM modeIn the “AstroDIM PD (DALI)” dimming mode, it is possible to

override the dimming profi le of AstroDIM with the presence

detection settings triggered by an external sensor (e.g. mo-

tion or presence sensor) that is connected to the SD port.

The sensor should support the electrical characteristics of

the SD port.

An active signal at the SD port (PD signal) starts the pres-

ence detection profi le, which is defi ned by the following

four parameters:

— PD level: Output level when the SD port is active.

— Start fade time: Fade time after the SD port has

become active.

— Hold time: Hold time after the SD port is not active

anymore.

— End fade time: Fade time after the hold period.

These parametere can be set using the Tuner4TRONIC®

software as shown in fi gure 33.

Figure 31: AstroDIM wiring with presence detector

Figure 32: Presence detection in AstroDIM mode

Figure 33: Presence detection configuration

LE

D m

od

ule

S1

LE

D m

od

ule


NT

Cse

t

NT

Cse

t

LE

Dse

t

LE

Dse

t

SD

SD

N NL LLE

D-

LE

D-

LE

D-

LE

D-

LE

D+

LE

D+

DA

DA

DA

DA

4DIMLT2 E 4DIMLT2 E

Switching cabinet

Sensor

PE

L1

N

SD


21

Table 11: Presence detection parameters


PD level OFF, 10 % 100 % 100 %

Start fade time 0, 2 s 8 min OFF

Hold time 0, 15 s 60 min OFF

End fade time 0, 2 s 8 min 4 s

Warning: If the output level falls below the minimum physical dim-

ming level, the minimum physical dimming level is used by

the LED driver. The software still displays the original value.

3.3 StepDIM feature StepDIM is a one-step dimming mode using an additional

control line or a switched phase (pilot line) to control one

or more light points and set the light output to a prepro-

grammed light level. The SD level and the fade time can

be set using the Tuner4TRONIC® software.

There are 3 different StepDIM operating modes:

— StepDIM (DALI)

— StepDIM inverse (DALI)

— StepDIM inverse, autodetect (DALI)

For StepDIM operation, the LED driver is connected to the

mains and a control line or a switched phase. Figure 34

shows the connection for the two different supply voltage

systems.

Figure 34: StepDIM wiring

LE

D m

od

ule

LE

D m

od

ule

S1

S1

S2

S2

LE

D m

od

ule

LE

D m

od

ule

Luminaire 1

Luminaire 1

Luminaire 2

Luminaire 2

NT

Cse

tN

TC

set

NT

Cse

tN

TC

set

LE

Dse

tL

ED

set

LE

Dse

tL

ED

set

SD

SD

SD

SD

NN

NN

LL

LL

LE

D-

LE

D-

LE

D-

LE

D-

LE

D-

LE

D-

LE

D-

LE

D-

LE

D+

LE

D+

LE

D+

LE

D+

DA

DA

DA

DA

DA

DA

DA

DA

4DIMLT2 E

OT 40 4DIMLT2 E OT 40 4DIMLT2 E

4DIMLT2 E

Switching cabinet

Switching cabinet

PE

PE

L1

L1

N

N

Lx

For 277 VAC supply system:

For 220-240 VAC supply system:

– not supported supported


22

The StepDIM application is supported by the following

supply systems.

The StepDIM port (SD) of the 4DIMLT2 LED drivers is trig-

gered by an input current referenced to the neutral (N). The

SD port fulfi lls the following characteristics.

In some installations, leakage currents might occur be-

tween the different phases due to old or damaged cables,

which have insuffi cient insulation or high capacitance

coupling. The unit can be triggered if the leakage currents

exceed the inactive SD input current. False triggering can

be avoided by connecting the SD input to the neutral or

using a bypass capacitance between SD and N.

3.3.1 StepDIM If, in the “StepDIM (DALI)” mode, the switch (S2) is closed

and the phase voltage Lx is applied to the SD port (SD ac-

tive), the output level is set to the SD level. Leaving the SD

port fl oating (SD inactive), the output level is set to the

nominal level.

— Nominal level: Output level when the SD port is

not active.

— SD level: Output level when the SD port is active.

— Switch-on fade time: Fade time after power-on.

— Start fade time: Fade time after the SD port has

become active.

— Hold time: Hold time after the SD port is not active

anymore.


These parameters can be set using the Tuner4TRONIC®

software as shown in fi gure 36.

Table 12: SD port usage in different supply systems

Supplysystem Nominal voltage O

T 4

0/12

0-

277/

1A0

4DIM

LT2

E

OT

60/

170

-24

0/1A

0 4D

IMLT

2 E

OT

90/

170

-24

0/1A

0 4D

IMLT

2 E

OT

16

5/17

0-

240/

1A0

4DIM

LT2

E

Single-phase

120 VAC, 60 Hz – – – –

220–240 VAC, 50/60 Hz

277 VAC, 60 Hz – – –

Three-phase

120 VAC, 60 Hz – – – –

220–240 VAC, 50/60 Hz

277 VAC, 60 Hz – – – –

Table 13: Electrical characteristics of the StepDIM port (SD)

StepDIM signal Input currentSD port

Input voltageSD port (SD-N)

Active (high) > 2.0 mApeak or > 196 VAC

Inactive (low) < 0.5 mApeak –

Figure 35: StepDIM behavior

Figure 36: StepDIM configuration

Table 14: StepDIM parameters


Nominal level OFF, 10 % 100 % 100 %

SD level OFF, 10 % 100 % 50 %


Start fade time 0, 2 s 8 min 3 min

Hold time 0, 15 s 60 min OFF

End fade time 0, 2 s 8 min 3 min


23

3.3.2 StepDIM inverseFor the “StepDIM inverse (DALI)” mode, the behavior is

inverted. If the switch (S2) is opened and the SD port is

fl oating (SD inactive), the output level is set to the SD level.

If a phase voltage is applied to the SD port (SD active), the

output level is set to the nominal level.

Figure 37: “StepDIM inverse” behavior

— Nominal level: Output level when the SD port is

active.

— SD level: Output level when the SD port is not active.

— Switch-on fade time: Fade time after power-on.

— Start fade time: Fade time after the SD port is not

active anymore.

— Hold time: Hold time after the SD port has become

active.


3.3.3 StepDIM inverse, autodetectIn the “StepDIM inverse, autodetect (DALI)” mode, the LED

driver automatically detects if it is used in a simple on/off

environment or in a StepDIM inverse installation. If a valid

“high” signal (SD active) is detected at the SD port for

longer than 20 minutes, the LED driver automatically

switches into the “StepDIM inverse” mode.

Figure 38: “StepDIM inverse, autodetect” behavior

Level %

SD

Main

sM

od

e

SD nominal level

SD level

< 20 min

On/off mode StepDIM inverse mode

> 20 min


24

This feature allows minimizing the number of different lumi-

naire confi gurations and keeps the stock lean.

Example:In some parts of StepDIM installations (e.g. roundabouts

or pedestrian crossings), the light output of the installed

fi xtures should not be reduced during the night. With the

“autodetect” feature, all LED drivers can be programmed

with the same settings: While the on/off fi xtures (SD port

not connected) still provide the full light output, the others

perform the requested dimming profi le.

3.3.4 Mixed StepDIM installations with 3DIM and 4DIMLT2 LED driversDue to improvements in the circuit robustness of the

StepDIM port of the 4DIMLT2 LED drivers compared to

the previous 3DIM generation, it is not possible to operate

3DIM and 4DIMLT2 LED drivers on the same SD line

without an additional relay on the SD port of the 3DIM

drivers. As mentioned in the 3DIM application guide, it is

necessary to install an additional relay in mixed installations

to separate the SD port of the 3DIM driver from the pilot or

control line (see fi gure 39). This is also valid for drivers

whose control port for the pilot line is not referenced to N

(see unkown ECG in fi gure 39).

Figure 39: StepDIM with mixed 3DIM drivers and 4DIMLT2 LED drivers

LE

D m

od

ule

LE

D m

od

ule

Luminaire 3

Vse

t

GN

Dse

t

+12V

set

SD

X NN LL NT

Cse

t

DA

DA

3DIM ECG

S1

S2

PE

L1

N

Lx

LE

D m

od

ule

Luminaire 2Luminaire 1

NT

Cse

t

LE

Dse

t

SD

N LLE

D-

LE

D-

LE

D+

DA

DA

4DIMLT2 EUnknown ECG

LE

D+

LE

D+

LE

D-

LE

D-


25

Figure 40: MainsDIM wiring

3.4 MainsDIM featureThe reduction of the mains amplitude is partly used for the

dimming of conventional lamps. In the MainsDIM operating

mode, the output current of the LED driver depends on the

mains input voltage. Standard electronic drivers compen-

sate for fl uctuations in the input voltage and do not support

this function. No additional control wires are needed in this

dimming mode (see fi gure 40).

The dimming behavior of the LED driver can be

programmed using the Tuner4TRONIC® software.

The programmable values can be found in table 15.

Table 15: MainsDIM parameters

Parameter Min. Max. Increment Default

Start Voltage 190 V 250 V 1 V 220 V

Start level 30 % 100 % 1 % 100 %

Stop Voltage 170 V 230 V 1 V 180 V

Stop level 30 % 85 % 1 % 30 %

Start-stop Voltage 20 V - - -

LE

D m

od

ule

LE

D m

od

ule


NT

Cse

t

NT

Cse

t

LE

Dse

t

LE

Dse

t

SD

SD

N NL LLE

D-

LE

D-

LE

D-

LE

D-

LE

D+

LE

D+

DA

DA

DA

DA

4DIMLT2 E 4DIMLT2 E

Switching cabinet

PE

L1

N


26

Figure 41: MainsDIM sample programming

Figure 42: DALI wiring

Note:To increase the light output stability against small voltage

fl uctuations, a minimum voltage difference of 5 V from the

“start voltage” is necessary to trigger the dimming of the

LED driver. The triggering of the dimming is performed with

a delay time of approximately 1 to 2 seconds. The setting

of the thresholds should also consider the voltage drop in

the real installation due to cable and contact resistance.

3.5 DALI operating modeFor DALI operation, the 4DIMLT2 LED driver is connected

to the mains and to a DALI controller (e.g. Street Light Con-

trol system) or DALI bus (see fi gure 42). The additional DALI

wires can be installed alongside the mains wires.

LE

D m

od

ule

LE

D m

od

ule

Luminaire 1 Luminaire 2N

TC

set

NT

Cse

t

LE

Dse

t

LE

Dse

t

SD

SD

N NL LLE

D-

LE

D-

LE

D-

LE

D-

LE

D+

LE

D+

DA

DA

DA

DA

4DIMLT2 E 4DIMLT2 E

Switching cabinet

PE

L1 S1

DALI bus/

controller

N


27

Up to 64 DALI LED drivers can be controlled via a 2-wire

control line – individually, jointly or in up to 16 groups. All of

them are connected in parallel to the two DALI wires. DALI

connections are not polarized. Therefore, plus and minus

do not have to be checked. The maximum allowed wire

length between two DALI LED drivers is 300 m. In case of

problems, a DALI repeater needs to be used.

The lighting can be switched and dimmed via the DALI

control line. A logarithmic (default) or linear dimming curve

can be set. Additional status information can be read out

and exchanged between the LED driver and the control

unit.

The DALI mode always has the highest priority. The LED

driver switches into the DALI operating mode as soon as

a valid DALI command is received. The DALI mode is kept

until the next power-off/on cycle.

By default, the dimming behavior is set to the logarithmic

dimming curve.

Note:The 4DIMLT2 family does not support the OSRAM Touch

DIM® functionality.

3.6 DC operation featureThe 4DIMLT2 drivers are prepared for a DC grid operation.

The suitable DC input voltage and output power range can

be provided on request. Please contact us if you plan a

DC application. As the in-built 4DIMLT2 LED driver fuse is

not rated for DC operation, an external rated DC fuse is

necessary.

The driver is capable to detect DC operation. Using the

Tuner4TRONIC® software, the DC detection can be activat-

ed and the output level (called “emergency mode” level in

the Tuner4TRONIC® software) in DC operation can be set.

During DC operation (“emergency mode”), the DALI func-

tions, the dimming modes and the “end of life” feature are

deactivated. After returning to AC supply, the LED driver

stays in the DALI mode until the next power-off/on cycle.

The thermal protection, constant lumen and operating

current features remain active.

The driver is not intended to be approved for emergency

lighting application.

Warning: If the output level in the DC mode falls below the minimum

physical dimming level, the minimum physical dimming lev-

el is used by the LED driver. The software still displays the

original value.

Figure 43: DC wiring

LE

D m

od

ule

LE

D m

od

ule


NT

Cse

t

NT

Cse

t

LE

Dse

t

LE

Dse

t

SD

SD

N NL LLE

D-

LE

D-

LE

D-

LE

D-

LE

D+

LE

D+

DA

DA

DA

DA

4DIMLT2 E 4DIMLT2 E

Switching cabinet

PE

L1

N

S1

DC

fuse

DC

fuse

4DIMLT2 LED drivers | Additional information

28

4 Additional information

4.1 InsulationThe 4DIMLT2 LED drivers have a double/reinforced insula-

tion between the primary and the secondary side and a

double/reinforced insulation between all electronic parts

and the casing.

The equipotential pin (EQUI) meets the requirements for

double insulation versus primary side and requirements for

basic insulation versus secondary side (it complies with the

requirements of IEC 60598-1 Annex A – safe to be touched

– in case of insulation fault between all secondary circuits

and accessible conductive parts).

The detailed insulation levels are defi ned in the instruction

sheet of the product.

Table 16: Insulation and Uout

OT

40/

120

-277

/1A

0 4D

IMLT

2 E

OT

60/

170

-24

0/1A

0 4D

IMLT

2 E

OT

90/

170

-24

0/1A

0 4D

IMLT

2 E

OT

16

5/17

0-2

40/

1A0

4DIM

LT2

Insulation (primary/secondary)

SELV SELV Double Double

Insulation of casing

Double Double Double Double

Uout 60 V 120 V 200 V 300 V

4.2 Cable preparationThe 4DIMLT2 LED drivers use open terminals for easy and

quick wiring. To ensure a safe and stable hold of the wires,

the insulation of the cables should be stripped accordingly.

Primary side:

Figure 44: Cable preparation, primary side, 40 W only

40 W only

DA

DA

SD

N

L

Figure 45: Cable preparation, primary side

60 W, 90 W and 165 W

DA

DA

SD

N

L

Figure 46: Cable preparation, secondary side and equipotential pin

40 W, 60 W, 90 W and 165 W

NTCset

LEDset

LED-

LED+

EQUI

0.2–1.5 mm2

0.2–1.5 mm2

0.25–2.5 mm2

8.5–9.5 mm

8.5–9.5 mm

10–11 mm


29

4.3 Incorrect wiring on the output sideThe 4DIMLT2 LED drivers are inherently protected against

incorrect wiring on the output side. Incorrect wiring be-

tween LED+ and LEDset or NTCset can damage the LED

driver irreversibly. If there is a short circuit between LED+

and LED-, the LED driver shuts down and tries to switch

the load back on. The same behavior might occur if the

output voltage falls below the minimum allowed voltage.

4.4 Input overvoltageIn case the supply input voltage exceeds 305 VAC, the LED

driver shuts down to indicate an unbalanced load condi-

tion. The LED driver can withstand up to 350 VAC for a maxi-

mum of two hours.

4.5 Surge protectionThe 4DIMLT2 LED drivers offer a common mode protection

level up to 10 kV (1 pulse) with a unique integrated overvolt-

age suppression for the connected LED module, which

minimizes the stress on the LED module and thus ensures

high reliability in the fi eld. To achieve the surge protection

levels, the EQUI pin needs to be connected to the heat sink

of the LED module (see fi gures 47 and 48). For the below-

mentioned surge protection levels and test conditions, the

voltage stress between the LED module and the heat sink

can be kept below 1.5 kVpeak. The EQUI pin meets the re-

quirements for protection class I and II luminaires. The

protection level between L and N or SD and N is 6 kV. In

addition, the SD port contains an active surge suppression

element referenced to N.

The following protection levels can be achieved.

Table 17: 4DIMLT2 surge protection levels

Surge between Test condition acc. to EN 61547

L-N 6 kV at 2-Ω source

SD-N 6 kV at 2-Ω source

L-EQUI/SD-EQUI/N-EQUI 8 kV at 12-Ω source

Surge between Test condition acc. to EN 61000-4-5, 1 pulse 1.2/50 µs

L-EQUI/SD-EQUI/N-EQUI 10 kV at 12-Ω source

Figure 47: Protection class I fixture

Figure 48: Protection class II fixture

LED module

LED module

Cable

Cable

PE

N

L

N

L

4DIMLT2 E

4DIMLT2 E

Connect EQUI pin toheat sink and PE

Connect EQUI pin toheat sink

If an additional surge protection device is used, please

contact your OSRAM sales contact for support.


30

5 Programming

The 4DIMLT2 LED drivers can be programmed using the

Tuner4TRONIC® software together with the hardware pro-

grammer DALI magic. This software consists of the follow-

ing software packages:

— T4T – Development

— T4T – Production

— T4T – Dynamic Link Library (DLL)

— T4T – Command Line Version

The software can be downloaded from the

www.myosram.com portal after registration.

For more information on the programming of 4DIMLT2 LED

drivers, please refer to the Tuner4TRONIC® manuals.

The 4DIMLT2 LED drivers need to be powered during pro-

gramming. They need to be supplied either with the mains

input voltage (case A) or with an SELV DC voltage (case B).

The low voltage allows for safe programming without the

need for additional precautions during production.

Note: A power-off/on cycle is necessary to activate the

programmed parameters.

Table 18: Supply voltage during programming

Case Supply voltage

Power Ambient temperature

A 120 VAC 40 W Acc. to LED driver datasheet220–240 VAC 40, 60, 90 and 165 W

277 VAC 40 W

B 48 VDC +/- 7 %1) 40, 60, 90 and 165 W -10 °C to +40 °C

DisclaimerAll information contained in this document has been col-

lected, analyzed and verifi ed with great care by OSRAM.

However, OSRAM is not responsible for the correctness

and completeness of the information contained in this

document and OSRAM cannot be made liable for any

damage that occurs in connection with the use of and/or

reliance on the content of this document. The information

contained in this document refl ects the current state of

knowledge on the date of issue.

Figure 49: LED driver programming

4DIMLT2

LN

DA

USB

DA

USB

Supply voltage

DALImagic

PC

DA DA

1) The power supply should be capable to deliver an average

current of 100 mA and contain an automatic restart function in

case of overload (typ. peak inrush current of 1 A).

OSRAM GmbH

Head offi ce:

Marcel-Breuer-Strasse 6

80807 Munich, Germany

Phone +49 89 6213-0

Fax +49 89 6213-2020

www.osram.com

www.osram.com

02

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