ABB i-bus
KNX
Commissioning
SA/S | 2CDC 505 056 D0208 119
3.2.5
Operating mode Heating Actuator
In
Heating Actuator
operating mode the Switch Actuators are generally used as setting elements for
electro-thermal valve drives. Room temperature can be controlled in conjunction with a room thermostat or
room thermometer which controls the Switch Actuator.
Various types of control are possible, e.g. PWM, 2-point control (1 bit) or continuous control (1 byte).
Every individual output of a Switch Actuator can be controlled via a 1 bit control value. For this purpose,
the
Switch
communication objects for the outputs have to be connected with the
Control value
communication objects of the room thermostats/temperature controllers.
Please note
The parameters of the room thermostat must be set to
continuous 2-point control
or
switching 2-point
control
.
With so-called continuous control, a 1 byte value [0...255] is used as an input signal. This input signal is
used in the Switch Actuator in accordance with the parameterizable cycle time in the ON and OFF
command of the switch rela
y. At 0 %, the valve is closed, and at 100 % it is fully open. Intermediate values
are calculated via pulse width modulation (PWM).
For further information see:
Pulse width modulation – calculation
, p. 164
Please note
Electromechanical Switch Actuators, including SA/S Switch Actuators, have mechanical contacts.
On the one hand this achieves electrical isolation and very high switching capacity, on the other it is
associated with switching noise and mechanical wear.
Important
When
Heating Actuator
operating mode is selected, the service life of the switching contacts must be
considered, see
Technical data
, from p. 9.
This is essential if the output is used as a continuous controller.
Considering these aspects, it can be useful to use an Electronic Switch Actuator, Fan Coil Actuator or Fan
Coil Controller from the ABB i-bus
®
KNX range. These actuators do not feature electrical isolation and
have a considerably smaller, but quite sufficient, switching capacity. Mechanical wear and switching noises
are not an issue.
Содержание i-bus SA/S 2.6.2.1
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