ABB i-bus KNX Product Manual page 79

ABB i-bus® KNX FUNCTION
If a frost alarm occurs, the blind/shutter will be moved to the position defined in the parameterPosition
for frost alarm and operation will be disabled.
The order of priority of alarms can be defined in the Order of priority of weather alarm, disabling and
forced operation.
NOTICE
The blind/shutter can freeze in place at temperatures below 0 °C. Attempting to move the frozen
blind/shutter can damage the drive.
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In case of a weather alarm, the blind/shutter cannot be operated via other group objects, manual op-
eration or the i-bus® Tool until the weather alarm is canceled. Travel range limits are not taken into ac-
count with weather alarms.
The sensors can be cyclically monitored by the device, and they can cyclically send the alarm status to
the device. If the device does not receive the alarm status within a defined monitoring time, the device
assumes that the sensor is faulty or communication is interrupted. The blind/shutter is moved to the
defined alarm position and disabled for all outputs upon which the alarm acts.
The monitoring cycle in the device should be at least four times as large as the cyclic transmission time
of the sensor. As a result, the parameterized alarm reactions will not be triggered immediately if a sig-
nal is missing (e.g. due to high bus load).
When a wind, rain or frost alarm is canceled, the blind/shutter will be moved to the position defined in
the parameter Position on cancellation of weather alarm, disabling and forced operation and operation
will be enabled.
4.1.3.1.4 Disable
The function Disable can be used to move the blind/shutter to a defined Position on disabling and dis-
able operation. When disabling is canceled, the blind/shutter is moved to the parameterized Position on
cancellation of weather alarm, disabling and forced operation and operation is enabled.
If the blind/shutter is disabled in its position, it cannot be operated via other group objects, manual
operation or the i-bus® Tool until disabling is canceled. Travel range limits are not taken into account
during disabling.
Higher-priority safety functions will continue to run.
Example:
With appropriate parameterization, this function can be used to monitor a terrace door. When the ter-
race door is opened, blind/shutter will be moved to the upper end position and disabled in this posi-
tion.
4.1.3.1.5 Forced operation
The function Forced operation can be used to set the output to a defined state and disable it. 1-bit or 2-
bit forced operation can be used for this purpose.
Use the function Frost alarm .
Note
Note
Note
Product manual | SAH/S x.x.7.1 | 2CDC505173D0211 Rev. A 79