ABB i-bus
®
KNX
Function
SU/S 30.640.2 | 9AKK107992A4580_EN Rev. A 15
4
Function
4.1
Device functions
The uninterruptible KNX power supply generates and monitors the KNX system voltage. The integrated
choke decouples the bus line from the power supply.
The power supply is connected to the bus line with a bus connecting terminal.
When the reset button is pressed, the overload indicator and the fault signal relay are reset. If the fault was
not corrected before the reset button was pressed, the fault is still present, the floating changeover contact
and the LED remain in the fault position. When the reset button is pressed, the bus line is not de-
energized. To de-energize the bus line, the bus connecting terminal must be disconnected from the power
supply.
Up to two 12 V lead gel accumulators can be connected to buffer the KNX system voltage in the event of
mains voltage failures. The batteries are charged via the SU/S 30.640.2. A temperature sensor is used to
control the charging voltage. In the event of a mains voltage failure, the SU/S 30.640.2 is powered by the
batteries.
ATTENTION –
The temperature sensor must be connected in any case so that the battery can be charged properly.
The fault of the device can be reported via a potential-free changeover contact. The potential-free
changeover contact is closed between terminals 4 and 5 in the normal state, and between terminals 5 and
6 in the event of a fault.
The following faults will cause the changeover contact to switch:
•
Mains voltage failure
•
Battery fault
•
Overvoltage and overload or short circuit of the bus line
Summary of Contents for i-bus KNX SU/S 30.640.2
Page 1: ... PRODUCT MANUAL ABB i bus KNX SU S 30 640 2 Uninterruptible KNX Power Supply 640 mA ...
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Page 42: ...ABB i bus KNX Appendix 42 9AKK107992A4580_EN Rev A SU S 30 640 2 13 3 Notes ...
Page 43: ...ABB i bus KNX Appendix SU S 30 640 2 9AKK107992A4580_EN Rev A 43 ...