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ABB i-bus
KNX
Commissioning
SA/S | 2CDC 505 056 D0208 105
•
only with closed contact
: Falling below or exceeding the set current threshold value can only be
evaluated when the contact is closed. As a result, a current threshold undershoot is never
detected (as an error) on a contact opened via KNX (current flow interrupted). The precondition
for evaluation to work properly is that the contact is closed by a switch action via KNX. Manual
switching is not recognized, the current threshold evaluation is not interrupted. Thus manual
switching is interpreted as a circuit-breaker or load fault. The evaluation occurs in accordance
with the time set in parameter
Evaluation delay [0...255s] after contact closing
.
•
only with open contact
: Falling below or exceeding the set current threshold value can only be
evaluated when the contact is open. In this way, for example, you can immediately detect when
a switched-off contact is inadmissibly switched on manually. Evaluation occurs about one
second after opening the contact. The time is fixed for system reasons and cannot be
influenced. Monitoring occurs not just once after a contact change, but rather continuously
(about once a second).
How does evaluation function?
Current value is detected in accordance with the parameterized contact position. Should it
be different to the contact position parameterized on the output of the SA/S, the current
value is neither detected nor evaluated. Furthermore, the current value is not recorded
during the parameterized evaluation delay and therefore no comparison with the setpoint is
undertaken during this period. When the evaluation delay has elapsed, the present current
value is recorded and compared with the current threshold value.
The status of the current threshold value is only sent if there is a status change in
comparison to the previous status value.
When
only with closed contact
is selected, the current is only detected with a closed contact,
compared to the current threshold value, and sent if there has been a change. If the contact
is opened, there is no current detection and thus no evaluation. A prerequisite is that the
contact is opened by a switching telegram initiated via KNX. Manual switching is not
recognized. In this case, the SA/S assumes that there is a cable break or load fault.
If current detection goes ahead, the detected current value is compared to the current
threshold value, and sent if there has been a status change.
Содержание i-bus SA/S 12.10.2.1
Страница 1: ...ABB i bus KNX SA S Switch Actuators Product Manual ...
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