ABB Busch E-contact System Manual page 79

The blackboard light can be activated via a push-button connected to the 6494-500 Extension
unit connection .
Notice
When determining the luminosities and setting of the device, pay attention to the
different brightness distributions in the room.
Depending on the reflection conditions in the room or at the workstation, a
considerably lower brightness value is determined at the mounting site of the
device. If it should be switched on, for example, when the brightness at the
workstations drops below 300 lux, you must set a value on the device, for
example, to about 80 lux.
The "Take over current brightness" app function indicates the current brightness
at the mounting site. This value can be taken over directly for simplified
commissioning.
Notice
When making the setting, pay attention to the legal requirements for luminosities
at the pupils' desk.
Examples of switching
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Fig. 31: Examples of switching: Classroom DALI light control with
[1] Optional: 6494-500 Extension unit connection to dim the lighting up and down in a targeted
manner.
[2] 6819/35-xxx-500 Universal BT, DALI
[3] When using voltage enabling of DALI operating devices.
[4] 6819/39-xxx-500 Universal, DALI extension unit
[5] 6819/39-xxx-500 Universal, DALI extension unit
[6] DALI operating device
[7] Extension push-button for manual switching of the lighting. Not required if the 6494-500
Extension unit connection is used.
System Manual 2CKA001473B9577
Information about planning and application
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