Table of Contents
Advertisement
®
ABB i-bus
KNX
Planning and application
4.1.2
Automatic control
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 dependingon the control value. For example, the following control value
ranges can be programmed for the corresponding fan speeds:
Control value
0...
10... 39 %
40... 69 %
70...100 %
In addition to manual control via the communication objects Switch speed x, Fan speed switch or Fan
speed up/down, the blower actuator can also operate in automatic mode together with one or more control
values. Communication objects Control value A and Control value B are available for this, or Control value
if there is only one input variable.
Automatic mode is enabled in the parameter window A: Fan or CDE: Fan via the parameter Enable auto-
matic operation. The number of assigned communication objects for the control values is defined in the -
Automatic control parameter window.
An automatic operation parameterized in ETS only becomes active after the first download. With a subse-
quent download, the automatic operating state (active, inactive) is retained as it was before the download.
There is however an exception when system properties such as the number of control value inputs, fan
control (changeover, step control) or the fan speed count (1/2/3) has been changed. In these cases, auto-
matic mode is activated if it has been enabled in ETS.
Automatic mode is switched off either by a manual control telegram via the communication objects Switch
speed x (x = 1, 2, 3), Fan speed switch or Fan speed up/down, or if a telegram with the value 0 is received
via the communication object Automatic ON/OFF.
Automatic mode can be reactivated by the communication object Automatic ON/OFF.
Activating one of the four limitations or forced operation does not end automatic operation. By using a
range limit (several fan speeds are permissible), a limited automatic control with several fan speeds is
possible.
84 2CDC508116D0203 | FCL/S x.6.1.1
Fan speed
9 %
0 (fan off)
1
2
3
Advertisement
Table of Contents
