GVS K-BUS
○
R
KNX/EIB
Thermostat
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This parameter is used to set the maximum allowable value of the PI control value. When control
value calculated from PI is larger than the set maximum value, Thermostat will send the maximum value.
If you use a Thermostat to control an actuator using PWM (Pulse Width Modulation) mode, this
parameter is very necessary. In PWM mode, if the PI control value is very large, it will cause the valve
open for a very long time and close for very short, it may be not long enough to close the valve, thus will
not make a good regulation of room temperature and the valve will be easily damaged.
Parameters "send control value at variation of%"
Options: 0 ... 15
This parameter is visible only when the control type is "continuous PI control" visible. Only when
setting the certain amount of change of control value, the object "heating / cooling control value" sends
current control value to the bus. 0 means not using this parameter.
Parameter "period of sending control value (1 ... 255 min)"
Options: 0 ... 255
This parameter sets time interval of control value cyclically send control value to the bus. 0 means
not using this parameter.
Each time it sends a control value to the bus, cyclical sending time will be re-timing.
Note: the cycle time here should corresponds to the monitoring time of temperature control
actuator , therefore the time of cyclical sending telegram should be half or less of the monitoring time of
temperature control actuator to prevent that, temperature control actuators fail to monitor because of
omission of cyclical telegram, and mistakenly judge Thermostat breaks down.
Parameter "PWM cycle time (1 ... 255 min)"
Options: 1 ... 255
This parameter is visible only when the control type is "switching PI control" ,and is used to set the
period of control object cyclical sending switch value. Thermostat sends switch value according to the
duty cycle of control value. For example, if the period is set to be 10mins,control value is
80%,Thermostat will send an open packet every 8 min, and send an closed packet every 2 min, and
continue to cycle this way. If the control value changes, the duty cycle of Thermostat sending open/close
telegram will change, while the period is still the time set by parameters.
If the control object sends a fully open or fully closed packet, the Thermostat will still cyclically send
telegrams.