ABB i-bus KNX Product Manual page 87

ABB i-bus® KNX FUNCTION
4.1.9.2 Blind/shutter control with slat adjustment
Fig. 30: Blind/shutter control with slat adjustment
After the blind/shutter moves up, the slats are usually open. The slats are closed and the blind/shutter is
moved down during a downward movement. The slats are opened and the blind/shutter is moved up
during an upward movement.
To adjust the slat angle in a targeted manner, short movements can be executed. The blind/shutter is in-
crementally moved in the required direction for a time defined in the parameter Duration of slat adjust-
ment (step). Alternatively, in the parameter Determine slat adjustment time, the total duration for slat
turning can be used to determine the On duration.
The smaller the duration of slat adjustment is, the more accurately the slat angle can be adjusted.
The device cannot process times shorter than 50 ms. The calculated time (quotient of total duration
for slat turning and the number of slat adjustments) must therefore always be longer than 50 ms.
NOTICE
Setting a minimum run time that is too short can damage the connected drive.
►
4.1.9.3 Reference movement
Each output continuously determines the current position of the blind/shutter and the slats based on
the individual movements.
Temperature fluctuations and aging processes can cause slight inaccuracies in determining the position.
In order to maintain high position accuracy, the position is updated in the device's memory when an end
position is reached.
If travel range limits prevent the end positions from being reached, the group object Trigger reference
movement can be used to trigger a reference movement to the upper or lower end position. After the
reference movement, the blind/shutter is moved to the position defined in the parameter Position after
reference movement.
If the reference movement was not completely ended, the position of the blind/shutter or the shutter is
unknown and is therefore not displayed. A reference movement is performed automatically on the first
movement command after the device is started (download, bus voltage recovery or ETS reset).
If the output is disabled by an alarm, the reference movement will be performed after the alarm is can-
celed.
Note
Pay attention to technical data for the connected drive
Product manual | SAH/S x.x.7.1 | 2CDC505173D0211 Rev. A 87