KNX/EIB
Switch Actuator with Secure
42
Note: in order to prolong the service life of relay and controlled equipment, the pulse period shall
be set as long as possible.
In the 1 bit control mode, pulse width control (PWM) is only used to control the action of the
driver when the driver is in fault, forced operation mode, safe operation mode and bus voltage is
restored.
Parameter “Control type”
The heating actuator can either be controlled via the 1 bit communication object Switch or the 1
byte communication object Control value (PWM). Options:
1 bit (on-off control)
1 byte (continuous)
In the control mode of “1bit”, the function of the heating actuator is as the same as the common
switch actuator: the thermostatic room controller control the output by the common switch command.
During a malfunction when the control signal is not received by the room thermostat, the relay will
undertake an autonomous PWM calculation. PWM cycle time is used for this purpose.
In the control mode of “1 byte”, the sending value of the room thermostatic controller is from 0 to
255 (corresponding from 0% to 100%), which is so called “continuous-action control”. 0% means the
valve is closed and at 100% fully open. It will adjust the output control via pulse width modulation.
Note: under the dynamic regulation function, each time the telegram of continuous regulation is
received, the channel will recalculate the duty cycle of the pulse according to the new control value,
when the time is up, and perform the action.
Parameter “Reply the status of channel for continuous control”
It is visible when selecting “1 byte (continuous)” in the parameter “Control type”, which is used to
report the status of the controlled valve, with 2 options according to the type of the controlled devices:
1 bit and 1 Byte. Options:
Nothing
Yes, 0% =“0”, otherwise “1”(1 bit)
Yes, 0% =“1”, otherwise “0”(1 bit)
Yes, continuous control value ( 1 byte )
