ABB i-bus KNX Product Manual page 72

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ABB i-bus KNX
Start-up
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Only after reaching lower end position: The tensioning or slot positioning is only executed when the
blind/shutter is moving to the lower end position. The following parameter appears:
70 2CDC 506 051 D0204 | JRA/S
Time for tensioning/slot positioning
in ms [0...5,000]
Options: 0...5,000
This parameter is used to set the time during which the blind/shutter is to be moved in the opposite
direction after a DOWN movement.
Note
Tensioning only takes place after a DOWN telegram. When it is activated, then tensioning/slot
positioning is triggered by the following types of travel telegrams:
Direct telegrams (DOWN, Position, Scene...)

 Automatic telegrams
 Manual telegrams via the manual operation buttons
 Safety telegram, e.g. Weather alarm, Forced operation
Here, the above-mentioned travel telegrams must last longer than the time set for
tensioning/slot positioning.
The length of tensioning/slot positioning must be shorter than the determined or parameterized
total travel time for the DOWN movement.
The tensioning/slot positioning time influences the position calculation and the status
communication objects. The value for the current position after tensioning/slot positioning is fed
back. Thus, in the case of a travel telegram during active cloth tensioning/slot positioning, a
position value smaller than the length of the tensioning is fed back.
Example:
Total travel time DOWN in s
Position telegram in %
Time for tensioning/slot positioning in s
Position feedback in %
60 s ≙ 100 %
50% ≙ 30 s
0.5 s ≙ [(100 % x 0.5 s / 60 s)] = 0.8 %
= 50 % - 0.8 = 49.2 %