Automatic Travel Detection - ABB i-bus KNX Product Manual

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ABB i-bus KNX
Planning and application
4.1.1

Automatic travel detection

Note
Automatic travel detection is only available for devices of type JRA/S x.y.5.1.
In the case of devices of type JRA/S 4.230.5.1 and JRA/S 8.230.5.1, automatic travel detection via
detection of end positions must always be parameterized in pairs for both outputs of a root (e.g. A+B,
C+D, etc.). The connected drives should be of the same type or have the same current consumption.
Mixed parameterization is not permitted and can lead to errors in travel time detection. Example:
Parameter
Detect travel times
(up/down)
Detect travel times
(up/down)
The travel times of the devices are determined using the automatic travel detection. Current recognition is
used to measure the length of the current flow, required by the drive for the movement from the lower to
the upper end position and vice-versa. The advantage of this is that aging processes and temperature-
related influences on the blind/shutter, e.g. expansion of the ribbons or cords of blinds, can be
compensated. This allows more accurate positioning of the blind/shutter. In addition, travel detection
simplifies and accelerates commissioning and sends an error message, if the current flow is interrupted on
the connected drive.
Travel detection takes place automatically during operation or optionally via the communication object
Trigger travel
positions or for position feedback.
Important
The travel times must be at least 3 seconds long, in order to be taken into account by the travel
detection. Travel times of less than 3 seconds are signaled as drive errors.
At the factory, internal travel times of 60 seconds for an UP or DOWN movement are preset in the as-
delivered state. If a device is freshly programmed or is reprogrammed with automatically determined
and saved travel times or installed in a different system, then the following must be taken into account:
If the parameter Delete saved travel times after download is parameterized with Yes, then the travel
times previously saved in the devices are overwritten with the default settings (infinite travel time). The
travel times measured during the first travel detection are then saved and declared valid.
If a further run time measurement occurs, then this is completed. The newly-measured value is then
compared with the currently saved value. If the deviation is > 5 %, then the output switches off and an
error message is output.
Bit no. 8 Drive error in the communication object Status information is set.
The LEDs of the affected output flash alternately.
The new travel times are only valid and are saved when


Output A
Parameter option
Yes – via detection of end
positions
No – set travel times
detection. The determined travel times serve as the basis for the calculation and activation of
A continuous movement takes place from the lower to the opper end position and vice-versa or
The travel times were determined using Trigger travel detection.
Output B
Parameter option
Yes – via detection of end
positions
Yes – via detection of end
positions
JRA/S | 2CDC 506 051 D0204 111
Note
OK
Not permitted