ABB i-bus KNX RC/A 8.2 Mounting And Operation Instructions page 12

Device connection
see illustration
(1) Feed-in and supply
The feed-in can be single, two or 3 phase (50/60Hz). Phase L1 is the internal supply of the
device and of the connected modules. The feed-in is passed on to the position of the modu-
les. Operation of a 3-phase 230/400 V-network is permissible. Multi-connection of the same
phase not permitted if it is separately protected by several circuit breakers (danger of over-
loading the neutral conductor).
(2) Connection of ABB i-bus
(3) Auxiliary 24 V DC feed-in
Some modules (e.g. 24 V DC blind actuator) require a separate feed-in, these are connected
directly to the modules. To make wiring easier, 24 V DC can be connected here, which is fed
on directly to the modules via the connecting cables. Terminals 7/8 serve for looping through
the 24 V DC. The connecting cable is enclosed with the modules.
The terminals can carry a constant maximum current of 8 A.
(4) Manual control and LED display
To operate the module function manually the module is to be selected first via the rotary
selection switch ("Module select"). After this the module can be controlled via the button and
the state displayed via the LEDs (for more detail see section 4.3). If no module is selected,
the state of the bus voltage can be displayed with the aid of the control buttons.
LEDs lit continuously 5 bus voltage OK
LEDs flashing 5 bus voltage not OK
(5) Programming key and LED
Please note that the programming key and LED only function when the power supply is con-
nected.
Background: To keep the consumption of the bus voltage low, the device is not supplied from
the bus.
1
KNX
®
EN