ABB i-bus KNX, Product Manual, Page: 242 / 264

ABB i-bus
®
KNX
Planning and application
240 2CDC508134D0202 | FCA/S 1.x.x.1
4.1.1.1 Fan with changeover switch
Fans are usually controlled with a changeover switch.
The following control table results for a three-stage fan, which simulates the device with a group of switch
outputs:
Terminal 8 Terminal 9 Terminal 10
OFF 0 0 0
Fan speed 1 1 0 0
Fan speed 2 0 1 0
Fan speed 3 0 0 1
4.1.1.2 Fan with step switch
In some cases, the fan is controlled via a step switch. The following control table results for a three-stage
fan, which simulates the device with its outputs:
Terminal 8 Terminal 9 Terminal 10
OFF
0 0 0
Fan speed 1 1 0 0
Fan speed 2 1 1 0
Fan speed 3 1 1 1
The step switch cannot be switched on rapidly. If, for example, fan speed 3 is to be switched on from the
OFF state, fan speeds 1 and 2 must be controlled with the associated dwell times first.
4.1.2 Automatic operation
With automatic fan control a fan drive is connected directly to the device and switched via three floating
contacts. A single-speed, two-speed or three-speed fan can be connected.
The fan speed is set automatically depending on the control value. For example, the following control
value ranges can be programmed for the corresponding fan speeds:
Actuating value Fan speed
0…9 %
0 (fan off)
10…39 %
1
40…69 %
2
70…100 %
3
Important
The device is purely an actuator, which does not have a controller for a room temperature controller
(thermostat).