Parameters for colour temperature

The settable colour temperature range of a group or single device can be limited by defining a lower and upper colour temperature value. This parameter defines the lower colour temperature value, which is not undercut in any operating state of the gateway. In this way, the colour temperature of the controlled lamps of the DALI operating devices can be limited individually and adapted to the respective application.

The configured minimum colour temperature must be lower than the maximum colour temperature.

The settable colour temperature range of a group or single device can be limited by defining a lower and upper colour temperature value. This parameter defines the upper colour temperature value, which is not exceeded in any operating state of the gateway. In this way, the colour temperature of the controlled lamps of the DALI operating devices can be limited individually and adapted to the respective application.

The configured maximum colour temperature must be greater than the minimum colour temperature.

At this point, the colour temperature value can be specified that is set when the device is switched on.

Track: When switching on, the internally tracked colour temperature most recently specified and in the "Brightness 0%" state is preset. The tracked colour temperature value is not influenced by an ETS programming operation or by a bus voltage failure ("no change"). When the bus/mains voltage returns, the colour temperature active most recently before the bus/mains voltage failure is restored. Hence, this colour temperature is taken into account as a colour temperature value to be tracked when switching on. As long as no colour temperature value could be tracked yet, the default value is "2.700 K", which is optionally limited by the minimum or maximum colour temperature.

Preset: The set colour temperature is set when receiving an ON telegram via the communication object "Switching - Setting" or when receiving a central telegram with the polarity "activated".

Memory value (value before the last switch-off): When switching on, the colour temperature is set that was active and stored internally before switching off the last time. This memory value is stored in a non-volatile manner in the gateway so that the value is retained after the bus or mains voltage returns. After an ETS programming operation, the memory colour temperature value is predefined to "2.700 K". This value is optionally limited by the minimum or maximum colour temperature.

Setting of the switch-on colour temperature value.

The switch-on colour temperature as a value specification can be configured basically within a range of 1,000...10,000 K. If the switch-on colour temperature is outside the range defined by the minimum or maximum colour temperature, the gateway limits the switch-on colour temperature to the defined limits.

This parameter is available only in the setting "Switch-on colour temperature = preset".

This parameter defines the dimming behaviour for absolute dimming using the object "Colour temperature - Setting" for a group or single device.

jumping to: As soon as a new colour temperature value is specified, it is instantly jumped to. Even if colour temperature values are instantly jumped to, the dimming procedure on DALI operating devices always takes a very short time. This dimming procedure is dependent on the system. The colour temperature value jumped to will be dimmed to within 0.7 seconds (short fading). This time cannot be altered.

dimming to: Once a new colour temperature value is specified, it is set by means of the configured dimming step time for absolute dimming.

Fading: As soon as a new colour temperature value is specified, it is set by means of the configured fading time for absolute dimming. The dimming process then always takes exactly the set time, regardless of the initial value of the dimming process.

Absolute dimming is triggered by specifying a colour temperature value. This value can be specified either by the 2-byte communication object "Absolute colour temperature - Setting" available in each group or single device according to KNX DPT 7.600 or by the 6-byte combination object "Absolute dimming (brightness and colour temperature) - Setting" according to KNX DPT 249.600 for the combined control of brightness and colour temperature.

The dimming speed for absolute dimming of the colour temperature can be configured here.

The absolute dimming of the colour temperature always takes place within the range limited by the configured minimum and maximum colour temperature. This range is divided into 255 dimming steps. The duration of a complete dimming process within this colour temperature range is calculated with to the formula: t = 255 x time between two dimming steps [ms].

This parameter is available only in the setting "When receiving a colour temperature value = dimming to".

Setting the fading time for absolute dimming.

This parameter is available only in the setting "When receiving a colour temperature value = fading".

Relative dimming of the colour temperature can be triggered either by the 4-bit communication object "Relative colour temperature - Setting" available for each group or single device or by the 3-byte combination object "Relative dimming (brightness and colour temperature) - Setting".

The dimming speed for relative dimming of the colour temperature can be configured here.

The relative dimming of the colour temperature always takes place within the range limited by the configured minimum and maximum colour temperature. This range is divided into 255 dimming steps. The duration of a complete dimming process within this colour temperature range is calculated with to the formula: t = 255 x time between two dimming steps [ms].

An absolute colour temperature telegram can also be switched on by a group or single device in the "OFF" state, with the behaviour set by this parameter.

Switch-on: The group or single device in the "OFF" state is switched to the configured switch-on brightness by an absolute colour temperature telegram. The colour temperature is set to the colour temperature value received. If the dimming behaviour is configured to "jumping to", the intended colour temperature value is immediately preset. If the dimming behaviour is configured to "dimming to", the dimming process starts at the colour temperature value most recently set by the gateway or which was tracked in the "OFF" state. The dimming process is executed according to the set dimming step time. The dimming process stops after reaching the specified colour temperature. If the dimming behaviour is configured to "fading", the dimming process starts at the colour temperature value most recently set by the gateway or tracked in the "OFF" state. The dimming process is executed according to the set fading time. The dimming process then always takes exactly the set time, regardless of the initial value of the dimming process. The dimming process stops after reaching the specified colour temperature.

No reaction: The group or single device in the "OFF" state is not switched by the absolute colour temperature telegram. The group or single device remains switched off. The next time the device is switched on, the last colour temperature value received is tracked only if the "Switch-on colour temperature" parameter is configured to the "track" setting.

A relative colour temperature dimming telegram can also switch on a group or single device in the "OFF" state, with the behaviour set by this parameter.

Switch-on: The group or single device in the "OFF" state is switched on to the configured switch-on brightness by a relative dimming telegram of the colour temperature. The colour temperature is set to the configured switch-on colour temperature. Based on this colour temperature state, the colour temperature to be dimmed is dimmed.Based on this colour temperature state, the colour temperature to be dimmed is dimmed.Based on this colour temperature state, the colour temperature to be dimmed is dimmed. The relative dimming telegram that leads to switching on, specifies the dimming direction and dimming increment. The dimming process stops after reaching the specified colour temperature.

No reaction: The group or the single device in the "OFF" state is not switched on by the relative dimming telegram. The group or single device remains switched off. The next time the device is switched on, the colour temperature value dimmed last is tracked only if the "Switch-on colour temperature" parameter is configured to the "track" setting.

It is optionally possible to automatically change the colour temperature proportionally when dimming the brightness. This makes it possible with little project planning to simulate a thermal radiator using almost any colour temperature controllable lamp (perception of the light source such as an incandescent or halogen lamp). This parameter can be used to set the behaviour of the colour temperature during absolute dimming of the brightness for the application mentioned.

Change proportional to brightness: During absolute dimming of the brightness with a 1-byte brightness value, the colour temperature of the group or single device is also changed proportionally. The colour temperature becomes warmer when dimming down. The colour temperature becomes colder when dimming up. The colour temperature can also be controlled separately.

No change: The absolute dimming of the brightness by a 1-byte brightness value has no effect on the colour temperature of the group or single device. The colour temperature can be controlled only separately.

It is optionally possible to automatically change the colour temperature proportionally when dimming the brightness. This makes it possible with little project planning to simulate a thermal radiator using almost any colour temperature controllable lamp (perception of the light source such as an incandescent or halogen lamp). This parameter can be used to set the behaviour of the colour temperature during relative dimming of the brightness for the application mentioned.

Change proportional to brightness: During relative dimming of the brightness with a 4-bit dimming telegram, the colour temperature of the group or single device is also changed proportionally. The colour temperature becomes warmer when dimming down. The colour temperature becomes colder when dimming up. The colour temperature can also be controlled separately.

No change: The relative dimming of the brightness by a 4-bit dimming telegram has no effect on the colour temperature of the group or single device. The colour temperature can be controlled only separately.