Brightness Setting - Gira 5142 00 Product Documentation

4.2.4.1.14 Brightness setting

The brightness of all status LEDs, the labelling field illumination and the LCD backlighting of the
push button sensor can be defined in the ETS. The parameter "Brightness for all LEDs" on the
parameter page "General" can be used to set the regular illumination brightness of all LEDs in
6 levels (level 0 = OFF, level 1 = dark, etc. Level 5 = bright).
Optionally the brightness can be changed during operation of the push button sensor, controlled
by a 1-bit communication object. Changing may be advisable, for example, to reduce the
brightness during nighttime hours. If switchover of the brightness via the object is required, then
it is necessary to set the parameter "Night reduction for reduced brightness ?" on the parameter
page "General" to "Yes". In this case the communication object "LED night reduction" becomes
visible in the ETS. As soon as a "1" telegram is received via this object, the push button sensor
redirects to the "Brightness for all LEDs during night reduction" configured in the ETS. If a "0"
telegram is received via the object, the push button sensor redirects back to the regular
brightness.
The switchover of the LED brightness is always performed softly by means of a brief dimming
process. Dimming up to a higher level value results in quicker dimming than with dimming to a
lower level value. This results in a slow soft dimming that is pleasing for the human eye. The
dimming speeds are fixed and therefore not changeable.
If in the event of an active night reduction there is a change of state in the display function of
any desired status LED, of the labelling field illumination or of the LCD backlighting (e.g. ON
after OFF), then all switched-on LEDs of the push button sensor are switched on with the
regular brightness for a duration of 30 seconds. In this manner it is possible in night operation,
especially with heavily reduced brightness values or even with switched-off LEDs, to identify
status changes more easily or in any case.
i In the ETS it is possible to perform configuration in accordance with the possible selection
of required stage values for the regular and reduced brightness. No check is made whether
a reduced brightness level is configured for the reduced brightness level. This also makes it
possible to use the object to switch over the object to larger brightness levels in
comparison to the regular brightness. It is recommended, however, to set the brightness
value for the night reduction lower than the regular brightness.
i After a device reset the regular brightness for switched-on LEDs is always valid. A
switchover via the night reduction only takes place if the corresponding object is written by
a telegram after a reset.
i When the status LED is activated via the regular display function or via the superposed
function, it is possible to let the status LED flash. The same applies for the labelling field
illumination. During flashing the LEDs switch synchronously between the "switched-on" and
"switched-off" states in the active brightness. This is not interpreted as a change of state of
the display function, by means of which the brightness is therefore also not switched over
automatically.
i When a display alarm message is active the status LEDs, the labelling field illumination and
the LCD backlighting of the push button sensor always flash with the regular brightness.
The push button sensor automatically deactivates the night reduction for the duration of the
display alarm message, and tracks it again, when the alarm message is switched off and
the object for the night reduction is still "1"-active.
Order No. 5142 00
Order No. 5145 00
Software "Push button sensor 3 plus"
Functional description
Page 106 of 281