GVS K-BUS
○
R
KNX/EIB
Thermostat
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marketing@video-star.com.cn
Tel.
:
(
8620
)
39338986
Fax.
:(
8620
)
39338465
41
The two control type "continuous PI control" and "switching PI control" have same PI control value,
but different control object. The control object of "continuous PI" sends out PI control (1byte) directly,but
control object of "switching PI" outputs an "on / off" control telegram according to the duty cycle of control
object.
Parameters "Symmetrical hysteresis temperature (× 0.1
℃
)"
Options: 5 ... 50
This parameter is visible only when the control type "Two position control", and is used to set a
delay interval to prevent that the small decline or rise of temperature causes the frequent switching
on/off of actuator,and results in the frequent switching on/off of the valve. If the delay interval is set to be
too large,it will reduce the number of actuator’s action and extend actuator’s life,but it will reduce control
accuracy.For example, in the mode of heating, if temperature setpoint is 20
℃
, the delay interval is 2
℃
,
then the control object will send an "on" telegram at 19
℃
,open the valve, and start heating.When
temperature rises to 21
℃
, the control object will send an "off" telegram, close the valve and stop
heating.
Parameter "Control value type"
Options: 1bit (ON / OFF)
1byte (0% / 100%)
This parameter is visible only when the control type is "Two position control",and is used to set the
type of control object.
If the option is "1bit", the object "Heating / Cooling control value" sends "on" and "off";
If the option is "1byte", the object "Heating / Cooling control value" sends only "0%" and "100%."