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ABB i-bus
®
KNX
Function
4.2
Monitoring and fault messages
The device continuously monitors the bus current, the mains voltage and the battery voltage. Faults are
indicated by LEDs directly on the device and reported via the floating changeover contact.
If an overload is present for more than 10 seconds, the fault message is logged, i.e., the potential-free
changeover contact and the corresponding LEDs remain in the fault position, even if the cause of the fault
message is no longer present and the KNX line is back in normal operation.
Once the fault has been corrected, the saved alarm can be acknowledged and deleted by pressing the
Reset button once. The potential-free contact switches to its idle position and the LED assumes the state
of normal operation.
If the fault has not been rectified before the reset button is pressed, the fault remains logged, the floating
changeover contact and the LED remain in the fault position.
4.2.1
Bus line monitoring
Overload/short circuit: The "I Overload" LED illuminates red if the bus line overloads. If the overload
causes bus currents of more than 1.2 A (e.g. in the event of a short circuit), the output voltage is
automatically switched off and the green "Un KNX" LED extinguishes. If the bus line is overloaded or short-
circuited for longer than 10 seconds, the floating changeover contact switches to the fault position.
4.2.2
Mains voltage monitoring
In the event of a mains voltage failure, the bus line is supplied from the connected accumulator. No faults
will occur in the system. If the mains voltage fails, the potential-free changeover contact switches to the
fault position and the "AC Input" LED extinguishes. When the mains power is restored, the floating
changeover contact will return to its idle position and the LED will illuminate green. A fault message is not
logged.
4.2.3
Battery voltage monitoring
A battery test is automatically performed at intervals of approx. 15 minutes. A manual battery test can be
triggered by pressing the Reset button. If there is a battery fault (battery voltage low Vbat < 10.6V), the
potential-free changeover contact switches to the fault position and the "Battery" LED extinguishes. The
"Battery" LED will flash if a faulty battery or a battery with reversed polarity is connected. When the cause
for the battery fault is remedied, the floating changeover contact will return to its idle position and the LED
will illuminate green. The fault message is not saved.
The "Battery" LED is off if no battery is connected.
In the worst case, it can take up to 15 minutes after the fault has occurred for the battery fault to be
displayed. Likewise, after the cause of the fault has been rectified, it may take 15 minutes for the floating
changeover contact to return to its idle position and for the LED to extinguish.
16 9AKK107992A4580_EN Rev. A | SU/S 30.640.2
Note
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