Schneider Electric KNX- Brightness and Temperature Sensor-ETS Software System user guide

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KNX brightness and temperature sensor

Operating instructions

Art. no. MTN663991

How to install the sensor

¼

WARNING

Risk of fatal injury from electrical current.

The device could become damaged.

Safety clearance must be guaranteed in accordance with IEC 60664-1. There must be at least 4 mm between the individual cores of the

230 V supply cable and the KNX cable.

230 V

4 mm

KNX

½

CAUTION

The device could become damaged.

Moisture and dirt can penetrate the housing. This can result in device failure and a short circuit on the bus line. Always install the device vertically with the screw fitting facing downwards.

For your safety

¼

DANGER

Risk of fatal injury due to electrical current.

All work on the device should only be carried out by skilled electrician. Observe the countryspecific regulations as well as the valid KNX guidelines.

1 Fix the sensor.

6 mm

14 mm

Getting to know the sensor

The KNX brightness and temperature sensor (referred to as sensor in the following) is suitable for brightness and temperature measurement in KNX building system technology. The measured values are sent to the bus.

Measurement range for brightness measurement:

1 to 100,000 lux (± 20% or ± 5Lux)

Measurement range for temperature measurement:

-25°C to +55°C (± 5% or ± 1 degree)

| The larger tolerances are applicable for brightness and temperature measurement.

25 mm

2 Aligne the sensor.

Connections, displays and operating elements

A

B

C

How to connect the sensor

1 Push the bus cable through the gasket into the terminal compartment.

|

Observe the correct polarity during connection.

2 Connect KNX.

3 Connect the bus voltage.

The LED flashes.

How to operate the sensor

1 Press the programming button.

The programming LED lights up.

2 Load the physical address and application into the device from the ETS.

The programming LED goes out.

The application has been loaded successfully, the device is operative.

|

When the device is operative, the LED stops flashing approximately 10 seconds after connecting the bus voltage or after loading the application. Otherwise an invalid application program has been loaded.

How to installation and care the cover

Cover installation:

1 Carefully fit the cover on the installed device.

2 Screw on the cover.

Cover care:

Clean the cover at regular intervals so that dirt does not generate inaccurate brightness measurement values.

| Use a damp cloth for cleaning.

Technical data

KNX:

Measurement range

DC 24 V

Temperature:

Brightness:

-25°C to +55°C

(± 5 % or ± 1 degree)

1 to 100,000 lux

(± 20 % or ± 5 lux)

Power consumption: < 150 mW

Type of protection when installed:

IP 54 when installed vertically with cover

A Programming LED

B Programming button

C Bus connecting terminal

Schneider Electric Industries SAS

If you have technical questions, please contact the

Customer Care Center in your country. www.schneider-electric.com

This product must be installed, connected and used in compliance with prevailing standards and/or installation regulations. As standards, specifications and designs develop from time to time, always ask for confirmation of the information given in this publication.

1

Application 2421 v1.2

Combination Sensor for brightness and temperature

1 Functional characteristics

The weather station measures temperature and brightness.

The measured values can be sent to the bus.

The sensor has 2 different channel types:

•

4 universal channels

•

1 sun protection channel

The universal channels can be used for sub-tasks (e.g. only brightness threshold) or for a combination of brightness and temperature.

A channel is made up of up to 2 logically linked weather conditions:

•

If the brightness is above/below the threshold AND

•

If the temperature is above/below the threshold AND

A non-relevant condition (e.g. temperature) can be set to the value "any" and is then ignored in logical linking.

As a result of the satisfaction or non-satisfaction of this AND link, a telegram is sent to the associated channel object (e.g. channel 1.1). If required, an additional second object

(e.g. channel 1.2) can be activated and thus send another telegram.

Each universal channel has one lock object and one teach in object for the brightness threshold.

The sun protection channel comprises:

• a

•

•

• up to 3 brightness thresholds

3 objects for actuating the drive (up/down – height % – slats %)

1 sun control object (morning/evening)

•

•

1 teach in object

1 safety object

The signal for "morning" or "evening" can be triggered either via the sun control object (e.g. via a clock switch) or via the dawn/dusk.

1.1 Benefits

•

•

2 weather variables can be detected and sent to the bus with a single device.

All brightness thresholds can be taught in locally if required.

1.2 Special features

Every brightness threshold can be directly programmed via a teach in object:

The user sends a byte to the teach in object and the threshold is set to the currently measured brightness (see Appendix: The teach in function ).

© 2008 Schneider Electric

2



2 The application program

2.1 Parameter pages

Name

Measured values

Channel use

C1, 2, 4, 5 brightness

C1, 2, 4, 5 temperature

C1, 2, 4, 5 universal

C1.1, C2.1, C4.1, C5.1

C1.2, C2.2, C4.2, C5.2

C3 thresholds

C3 blind

C3 shutters / textile sun

protection

C3 value

C3 scenes via 1-bit

objects

Description

Sending the current actual values for brightness and temperature

Number and usage of the channels

Use of the universal channels C1, C2, C4 and C5:

• with all weather measured values

• as mere brightness or temperature thresholds

The channel C3 is a mere sun protection channel.

Setting of the brightness condition

Setting of the temperature condition

Setting of both measured values – temperature and brightness – for the send condition

Telegram type and send behaviour for satisfied and non-satisfied send conditions for C1, 2, 4, 5.

Second telegram for C1, 2, 4, 5.

Setting of the telegram type for satisfied and non-satisfied send conditions.

Setting of the brightness threshold for dawn/dusk and the remaining thresholds (max. 3) for height and/or slat positions.

Delay times for increasing and decreasing brightness.

Setting of the desired height and slat positions in case the different thresholds are exceeded.

Setting of the relevant height in case the thresholds are exceeded.

Setting of the value to be sent in each case if the thresholds are exceeded.

Setting of the scene to be sent in each case if the thresholds are exceeded.


3



2.2 Communication objects

2.2.1 Object characteristics

The weather station has over 27 communication objects.

Some objects can assume various functions and names depending on their configuration.

No Function

0

Physical value

1

Physical value

4

Switch

5

Priority

Value

Switch

Priority

Value

Object name

Brightness value

Temperature value

C1.1 brightness threshold /

temperature threshold /

universal channel

C1.2 identical to C1.1.

6

Input C1

EIS type

2-byte

EIS 5

2-byte

EIS 5

EIS 1

EIS 8

EIS 14

EIS 1

EIS 8

EIS 14

Behaviour

Send

Send

Send

Send

7

8

13

Input

Switch

Priority

Value

9

Switch

Priority

Value

11 Input

12 Drives up/down

Height

C1 teach in



universal channel


C2 teach in

C3 up/down

C3 blinds

C3 shutter

EIS 1

8-bit

EIS 2

EIS 1

EIS 8

EIS 14

EIS 1

EIS 8

EIS 14

Receive

Send

Send

1-bit

Receive

EIS 1

8-bit

EIS 2

Receive

1-bit

EIS 7

EIS 6

Send

Send

Value C3 send value EIS 14

Send

14

Position

Send

15 Morning=1 / Evening=0

Scenes 1 + 2

C3 slats

Scenes 3 +4

C3 sun control

EIS 1

EIS 2

EIS 1

1-bit

EIS 1

Send

Receive


4



Continued

No Function Object name

17 Input

18 Switch

Priority

Value

19 Switch

Priority

Value

21 Input

22 Switch

Priority

Value

23 Switch

Priority

Value

25 Input

C3 teach in



universal channel


C4 teach in



universal channel


C5 teach in

EIS type Behaviour

EIS 1

8-bit

EIS 14

EIS 1

EIS 8

EIS 14

Receive

Send

EIS 1

EIS 8

EIS 14

Send

1-bit

EIS 1

Receive

8-bit

EIS 14

EIS 1

EIS 8

EIS 14

EIS 1

EIS 8

EIS 14

Receive

Send

Send

EIS 1

8-bit

EIS 14

Receive

2-byte

EIS 5

Send

Number of communication objects:

Number of group addresses:

Number of associations:

27

108

108


5



2.2.2 Object description

2.2.2.1 Physical values

•

Object 0 "Brightness value"

Sends the current brightness value either if there is a change in brightness and/or cyclically

(depending on the configuration).

Only the value measured directly by the weather station is sent.

Received external actual values (C6, C7) are not considered.

•

Object 1 "Temperature value"

Sends the current temperature value either if there is a change in brightness and/or cyclically

(depending on the configuration).

2.2.2.2 Universal channels C1, C2, C4, C5

•

Object 4, 8, 18, 22 "Cx.1 Brightness threshold", „Cx.1 Temperature threshold“,

„Cx.1 Universal channel“

This is the first output object of a universal channel.

The function of the object depends upon the selected telegram type (see parameter page for first object: C1.1, C2.1, C4.1, C5.1).

Telegram type Format Sent telegrams

Switching command

Priority

EIS 1

(On/Off)

EIS 8

On/Off

2 Bit Telegram:

Function Value

no priority (no control)

Priority OFF (control: disable, off)

Priority ON (control: enable, on)

0

2

3

Value EIS

(0-255)


6



•

Object 5, 9, 19, 23 "Cx.2 brightness threshold", "Cx.2 temperature threshold",

"Cx.2 universal channel"

This is the second output object of a universal channel.

This object enables an additional telegram to be sent if required.

If on the parameter page C1.1 (or C2.1 etc.) the parameter "Should a second telegram be sent?” is set to YES then a further parameter page (C1.2 or C2.2, C4.2, C5.2 etc.) and the associated object

(object 5) are added.

The telegram type can be parameterized independently of the first output object.

The same setting options are available for this purpose as for the first output object (see table above for object 4).

The cycle time and the disabling behaviour are valid together for both objects (objects 4+5).

•

Object 6, 10, 20, 24 "Lock Cx"

A "1" on the object sets the locked status for the relevant channel - provided the channel has been configured for it.

The behaviour on setting and cancelling the locked status can be selected on the parameter page

"C1.1" (or C2.1, C4.1, C5.1).

The locked status can be cancelled again with a "0".

•

Object 7, 11, 21, 24 "Teach in Cx"

If the value $80 (128 as a decimal number) is sent to this object then the previously parameterized value for the brightness threshold is replaced by the current actual brightness value and saved.

The newly saved value is sent via object 40 to the bus as confirmation that the teach in process was successful. For further information refer to the Appendix: The teach in function


7



2.2.2.3 Sun protection channel C3

•

Object 12 "Up/down"

This object is used to completely open or close the sun protection devices.

0 = raise

1 = lower

•

Object 13 "C3 scenes 1 + 2", "C3 value", "C3 blind", "C3 shutters"

The function of this object depends on the parameter "Telegram type" on the parameter page

"C3 blind / shutters / value / scenes".

Telegram type

Send value

Format

EIS 14

8-bit

Sent telegrams

Sends a value between 0 and 255

Blind

Shutters / textile sun protection

Scenes via

1-bit telegram

EIS 2

8-bit

EIS 8

1-bit

Sends the required blind or shutter height from 0% to 100% to the blind actuator in 1% increments

In this configuration, this object and the following object are used to realize a scene control.

2 scene objects are required to distinguish between 4 scenes, e.g. object 13 + object 14 (or objects 27+28 , objects 34+35).

Depending on which object sends which status, one of 4 scenes can be called.

Object 13 sends

Value Meaning

Object 14 sends

Value Meaning

The last received telegram is always decisive for the recipient

(actuator).


8



•

Object 14 "C3 slats", "C3 scenes 3+4"

The function of this object depends on the parameter "Telegram type" on the parameter page

"C3 blind / shutters / value / scenes". It is only present for blinds and scene control.

Telegram type

Blind

Format Sent telegrams

EIS 2

8-bit

Sends the required slat position from 0% to 100% in 1% increments to the blind actuator

Scenes via

1-bit telegram

EIS 8

1-bit

See object 13

•

Object 15 "C3 Sun control"

This object is only present if on the parameter page "C3 Blind / shutters / value / scenes“ the activation of the sun control is set to "via object".

A "1" on the object activates the sun control and the weather station sends the necessary height and position telegrams to the actuator.

The sun control is deactivated with a "0", and the drives are then no longer controlled by the weather station.

•

Object 16 "Safety"

If safety is set (= 1) then the 2 objects (e.g. C3 height and C3 slats) of the affected channel no longer send. The reaction to the start of safety is left to the actuator.

On cancellation of safety (=0):

During the daytime: the delay timers are re-triggered and the current channel status is re-sent. This means that the actuator is sent the new settings from the weather station after the end of the safety phase.

During the night, the parameters "Reaction to sun control OFF" or "reaction to twilight" apply depending on what is configured (activation of the sun control via object or dawn/dusk threshold).

The safety telegrams can be generated by a rain and wind sensor.


9



•

Object 17 "C3 teach in"

All of the brightness thresholds of a sun protection channel can be taught in with this object. Each threshold is addressed individually.

Teach in code Threshold

Hex Dec

For more detailed information refer to the Appendix: The teach in function .

The newly saved values are sent via object 40 to the bus as confirmation that the teach in process was successful.

2.2.2.4 Feedback object

•

Object 40 "Brightness thresholds"

This object can send the current settings of the brightness thresholds either automatically or on request.

A request is triggered by sending any value between $00 and $7F (or between $84 and $FF) to the teach in object.

The values $80, $81, $82, $83 being reserved for the teach in function.

Feedback options

Situation

After downloading the application

Behaviour

All of the brightness thresholds of all of the channels are sent one after another.

After teaching in a threshold

On sending a request

(on teach in object)

All of the brightness thresholds of the concerned channel are sent one after another.

All of the brightness thresholds of the concerned channel are sent one after another.

The brightness thresholds are sent in the same order as they appear in the ETS

(see table below)

Thresholds that are not active will not be sent (e.g. brightness threshold 3 as channel was parameterized only with 2 thresholds).


10



Sending order: After download every used brightness thresholds will be sent

Channel Threshold

1 Brightness

Note

2 Brightness

3

Dawn threshold

is always sent

Brightness threshold 1

is always sent



only if channel was parameterized as a brightness sensor or as an universal channel only if 2 or 3 thresholds were parameterized

(Parameter: „how many brightness thresholds“)

4 Brightness

5 Brightness

only if channel was parameterized as a brightness sensor or as an universal channel

As a result of the restrictions due to EIS5, some values are rounded up or down, so for example the value 10000 Lux may be displayed as either 9999.36 ($4FA1) or 10004.48

($4FA2).


11



2.3 Parameters

2.3.1 Measured values

Designation

Send brightness value in the event of a change of

Values

Not due to a change

10 %, but at least 1 lx




Meaning

Send only cyclically (if enabled)

Only send if the new value differs on more than 10%, 20% etc… from the last sent one.

However, if a change of 10% corresponds to a brightness change < 1 lx, then the value is not sent until the change is at least

≥1 lx.

How often should the current brightness value be sent again?

Send brightness value cyclically

Do not send cyclically

Every minute

Every 2 min.

Every 3 min.

…

Every 30 min.

Every 45 min.

Every 60 min.

Send temperature in the event of change of

Not due to a change

0.5 °C

…

1.0 °C

2.5 °C

Send temperature cyclically Do not send cyclically

Every minute

Every 2 min.

Every 3 min.

…

Every 45 min.

Every 60 min.

Manual setting: -64 .. 64 Temperature offset in 1/10°C (-64 .. 64)

Only send cyclically (if enabled)

Send if the value has changed for example by 0.5°C or 1°C since it was last sent.

How often should the current temperature be sent again?

Manual Offset, case sent value differs from the actual ambient temperature.

Example:

Ambient temp. = 20°C

Sent temp.= 22°C

Offset = -20 (i.e. 20 x 0,1°C)


12



2.3.2 Channel use

Designation

Function of

C1, C2, C4, C5

Function of

C3

Values

Brightness sensor

Temperature sensor

Universal channel

Sun protection

Meaning

Function of the universal channels:

Brightness condition only

Temperature condition only

Condition with brightness and temperature linked in an AND operation

This channel has fixed settings as sun protection channels, with one dawn/dusk threshold and up to 3 further brightness thresholds for blind or shutter controls


13



2.3.3 C1, C2, C4, C5 as brightness thresholds

Designation

Brightness condition

Light hysteresis

Values below 2 lx to over 90,000 lx (in 147 increments)




Meaning

Should the condition be satisfied when the brightness is below or

above the selected value?

The hysteresis prevents frequent switching after small changes in brightness.

Depending on the selected condition, it can be either negative or positive.

Example with 20% hysteresis:

Condition: "ABOVE 4500 Lux"

= satisfied from 4500 lx and no longer satisfied at 4500 lx - 20%

Condition: "Below 4500 Lux"

= satisfied below 4500 lx and no longer satisfied at 4500 lx + 20%

Response time when it gets lighter and the selected threshold is passed as a result.

This setting prevents conflicting telegrams from being sent in response to temporary fluctuations in brightness.

Delay when brightness increases

Delay when brightness decreases

None

5 seconds

10 seconds

20 seconds

30 seconds

1 minute

2 minutes

3 minutes

5 minutes

10 minutes

15 minutes

None

5 seconds

10 seconds

20 seconds

30 seconds

1 minute

2 minutes

3 minutes

5 minutes

10 minutes

15 minutes

2.3.4 C1, C2, C4, C5 as temperature thresholds

Designation

Temperature condition

Values below –10°C to over 40°C

(in 1K increments)

Temperature hysteresis 1°C

1.5°C

2°C

2.5°C

Response time when it gets darker and the selected threshold is passed as a result.


Meaning

Should the condition be satisfied when the temperature is below or


The hysteresis prevents frequent switching after small temperature changes.

It can be negative or positive depending on the selected condition

(above or below xx°C) (see table above: Light hysteresis).


14



2.3.5 C1, C2, C4, C5 as universal channels

Designation

IF brightness

Light hysteresis

Values

Any below 2 lx to over 90,000 lx (in 147 increments)





Meaning

Ignore brightness

Should the brightness condition be satisfied when the brightness is

below or above the selected value?

The hysteresis prevents frequent switching after small changes in brightness.


Example with 20% hysteresis:

Condition: "ABOVE 4500 Lux"

= satisfied from 4500 lx and no longer satisfied at 4500 lx - 20%

Condition: "Below 4500 Lux"

= satisfied below 4500 lx and no longer satisfied at 4500 lx + 20%

Response time when it gets lighter and the selected threshold is passed as a result.



AND temperature

Temperature hysteresis

None

5 seconds

10 seconds

20 seconds

30 seconds

1 minute

2 minutes

3 minutes

5 minutes

10 minutes

15 minutes

None

5 seconds

10 seconds

20 seconds

30 seconds

1 minute

2 minutes

3 minutes

5 minutes

10 minutes

15 minutes

Any below –10°C to over 40°C

(in 1K increments)

1°C

1.5°C

2°C

2,5°C

Response time when it gets darker and the selected threshold is passed as a result.


Ignore the temperature.

Should the condition be satisfied when the temperature is below or


The hysteresis prevents frequent switching after small temperature changes.



15



2.3.6 C1.1, C2.1, C4.1, C5.1, and C1.2, C2.2, C4.2, C5.2 (second telegram)

Designation

Telegram type C1.1

If all conditions are met

Telegram

Values

Switching command

Priority

Value

No telegram,

Send following telegram once,

Send cyclically

Switch-off command

Switch-on command

Meaning

1-bit ON/OFF telegram

2-bit EIS 8

1-byte 0 ... 255

Send behaviour if the weather conditions are satisfied.

For telegram type "Switching command"

For telegram type "Priority" No priority

Priority, ON (down)

Priority, OFF (up)

Telegram 0 ... 255 For telegram type "Value"

If not all conditions are met No telegram,

Send following telegram once,

Send cyclically

Telegram Switch-off command

Switch-on command

Send behaviour if at least one condition is satisfied.

For telegram type "Switching command"

For telegram type "Priority"

Cycle time (if used)

Behaviour when setting the lock

No priority

Priority, ON (down)

Priority, OFF (up)

Telegram 0 ... 255

Every minute

Every 2 min.

Every 3 min.

Every 5 min.

Every 10 min.

Every 15 min.

Every 20 min.

Every 30 min.

Every 45 min.

Every 60 min.

Ignore locks

Do not send

Same as for unsatisfied condition

For telegram type "Value"

How often should the telegrams for

CX.1 and CX.2 be sent?

No lock possible

Does not send while the lock object is set.

The affected channel behaves as though the condition was not satisfied.


16



Continued

Designation

Behaviour when releasing the lock

Values

Do not send

Update channel

Should a second telegram be sent?

Yes

No

Meaning

Not automatically resent when the disable is cancelled

The current channel status is sent immediately as soon as the disable is cancelled.

If "Yes" is selected then a new parameter page appears

(e.g. C1.2) with a second send object. It can be used to send 2 different telegrams at the same time on the same channel.

The cycle time and the disabling behaviour apply jointly to both telegrams (e.g. C1.1 and C1.2).


17



2.3.7 Sun protection channel: C3 thresholds

Designation

Light measurement via

Dawn/dusk threshold

How many brightness thresholds?

Values

Internal sensor

2 lx ... 500 lx

(in 36 increments)

1 threshold

2 thresholds

3 thresholds

2000 lx ... 60 klx Brightness threshold 1



6000 lx ... 70 klx

10 klx ... 80 klx



10 s (for test purposes only)

1 ... 20 min.

(in 1 minute increments)

10 s (for test purposes only)

5 ... 20 min.

(in 1 minute increments)

Meaning

Fixed setting

Threshold for detection of the start/end of the day.

3 thresholds enable accurate positioning of the blind slats or 3 different shutter positions.

The 3 threshold values must be entered in order of magnitude

(smallest first) and be separated by at least 4000 lx. Non-permitted values are automatically corrected in the device.

(refer to the Appendix, Auto correction of the thresholds for sun protection channels )

Only for initial start-up and tests.

Response time when it gets lighter and a threshold is passed as a result.

This delay prevents conflicting responses from the drives to temporary fluctuations in brightness.

Only for initial start-up and tests.

Response time when it gets darker and a threshold is passed as a result.

This delay prevents conflicting responses from the drives to temporary fluctuations in brightness.


18



2.3.8 C3 blinds

This heading appears on the parameter page of C3 if “Blind” was selected as the telegram type.

Designation

Telegram type

Activation of sun control

Values

Scenes via 1-bit telegrams

Send value

Blind

Shutters / textile sun protection

Via dawn/dusk threshold

Meaning

Purpose of the sun protection channel

Reaction to dawn

Via object

Raise & sun control ON

Raise & single sun control

The automatic sun control becomes active immediately after the dawn/dusk threshold is exceeded.

The automatic sun protection is activated via the relevant sun control object (e.g. via a timer).

When the dawn/dusk threshold is exceeded the blind is raised and positioned accordingly when the threshold 1 is exceeded.

If the value drops below threshold 1 then the blind is raised again.

As above, except that the blind is not raised again until dusk.

The "single" function is used as a calming measure for the facade, to prevent continuous raising and lowering of the drives.

See Appendix: Parameter: "SINGLE sun control" (sun protection channels) )


19



Continued

Reaction to sun control ON

Raise & sun control ON

Raise & single sun control

Not until dawn: start & sun control ON

Drive height from threshold 1

Turn slats between threshold 1 and 2

Turn slats between threshold 2 and 3

Turn slats above threshold 3

Reaction to dusk

0% ... 100%

(in 2.5% increments)

0% ... 100%


0% ... 100%


0% ... 100%


Sun control OFF & raise,

Sun control OFF & lower

Reaction to sun control OFF

Sun control OFF & raise,

Sun control OFF & lower,

Sun control OFF & lower at dusk/dawn

Only visible if the sun control is activated via an object.

When the sun control object is set:

Raise the blind and position it according to a further threshold.

As above, except that the blind is not raised again until the sun control object is reset.


The blind is not raised until the sun control object has been set and the dawn/dusk threshold has been exceeded.

The blind is lowered once after threshold 1 is exceeded.

Slat position when threshold 1 is exceeded.



Should the blind be raised or lowered in the evening?

Only visible if the sun control is activated via an object.

Upon resetting the sun control object:

Raise the blind

Lower the blind

Do not lower until the light has dropped below the dawn/dusk threshold.


20



3 Appendix

3.1 Sun protection channel (C3)

3.1.1 Blind application:

When the threshold 1 is exceeded the blind is lowered via the first object (height), and the slats are moved into a first position via the second object.

When the threshold 2 is exceeded the slats are moved to a second position.

When the threshold 3 is exceeded the slats are moved to a third position.

3.1.2 Shutters / textile sun protection application:

When the threshold 1 is exceeded the shutter is moved to a first position via the first object (height).

When the threshold 2 is exceeded the shutter is moved to a second position via the first object

(height).

When the threshold 3 is exceeded the shutter is moved to a third position via the first object (height).

The user has the option of reducing the number of thresholds to two or one.


21



3.2 The teach in function

3.2.1 Principle:

All parameterized brightness thresholds can be directly adapted locally.

The teach in process takes place via a telegram, as a result of which the current measured value replaces the previously parameterized threshold value.

The brightness thresholds are taught in via an object (1 per channel).

Each threshold is addressed via its own teach in code (see table below).

If for example the value $80 (decimal equivalent: 128) is sent as a teach in command to the teach in object of a sun protection channel then the (previously parameterized) value of the dusk/dawn threshold is replaced by the current brightness value, and this new value is saved.

The same applies to the brightness thresholds 1...3 with $81 to $83 as the teach in commands.

The values are automatically corrected in the event of an incorrect input – see below: Auto correction of the thresholds for sun protection channels.

With a universal channel the brightness threshold is taught in with the code $81 (129 dec.).

The currently configured selection "above XY Lux" or "below XY Lux" is kept, only the Lux value is changed.

Example: The configuration is > 5000 lx and the teach in object is activated at a brightness of 4000 lx.

Result: The new threshold is now > 4000 lx.

Teach in code and threshold values for sun protection channels

Teach in code

Hex Dec

Threshold Lower threshold

2 lx

2 klx

6 klx

10 klx

Teach in code and threshold values for universal channels

Teach in command

$81

Threshold

Brightness condition

Lower limit

2 lx

Upper threshold

500 lx

60 klx

70 klx

80 klx

Upper limit

90 klx


22



3.2.2 Auto correction of the thresholds for sun protection channels

The values which are to be taught in must be in the right order in relation to each other, and they must be separated by at least 4000 lx.

The teach in brightness threshold 3 must be greater than the brightness threshold 2, which in turn must be greater than the brightness threshold 1 etc.

If this is not the case then the values are corrected according to the following rule:

The last threshold to have been taught in determines the others if the difference between the thresholds was too small.

If a value is taught in for threshold 3 which is < threshold 2, then thresholds 1 and 2 are lowered accordingly.

If the values fall below the lower limits (or above the upper limit for dawn) then they should apply as parameters.

The automatic correction is only concerned with the lower limits.

(Exception: dawn/dusk threshold)

During teach in

If the teach in values are not OK then only the last one is valid – the others are adapted to it.

If the last entry is unusable then the thresholds in the table apply.

Threshold Lower limit Upper limit

Dawn/dusk threshold

Threshold 1

Threshold 2

Threshold 3

2 lx

2 klx

6 klx

10 klx

500 lx

60 klx

70 klx

80 klx

After downloading the application:

If the distance between the thresholds is too small then threshold 1 is taken as a reference and the others are made to follow it.


23



3.3 Parameter: "SINGLE sun control" (sun protection channels)


3.3.1 For a blind:

When the first threshold is exceeded the blind is lowered to the parameterized height, where it then remains for the whole day. It is not moved again until dusk (or via the sun control object).

However, the slats are still continuously repositioned using the current brightness value.

3.3.2 For shutters / value / scenes

It only leads to a telegram if the next-higher threshold is exceeded.

If the value drops below one of the three thresholds then no telegram is sent.

Accordingly, the shutter is lowered further and further as it gets lighter and stops at the position where it is when it starts to get a little darker. All other settings are made directly and manually by the user.

Similarly to the blind, the shutter is not moved again until dusk (or via the sun control object).

•

•

With normal sun protection, the drives are already raised if the value drops below threshold 1.

A telegram is always sent at the start and end of the day (raising, lowering), whether as a result of passing the dawn/dusk threshold or through the receipt of a sun control telegram.

•

This telegram is also sent in the evening if the threshold 1 was not exceeded during the daytime and therefore no conflicting telegram was sent.


24

Schneider Electric KNX- Brightness and Temperature Sensor-ETS Software System user guide

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