GVS K-BUS
○
R
KNX/EIB
Thermostat
www.video-star.com.cn
Tel.
:
(
8620
)
39338986
Fax.
:(
8620
)
39338465
36
which could receive 1byte type controlling value.)
If you select "Switching PI Control", the controlled object sends switch value and directly controls
the output of actuator by the switch command, which means the controlled object directly switches
solenoid valve. The period of cyclical transmitting of switch value can be set through parameter, and the
Thermostat will send switch value according to the duty cycle of control target value. For example,
assuming the cycle is 10mins (set in the Thermostat), the controlling value is 80%, then the valve will be
opened for 8mins, closed for 2mins, all cycles in this way . Thermostat will calculate the control value
every 30 seconds according to temperature conditions, ratio range and integration time.
If you select "Two Position Control", you can set a delay interval through parameter 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. The delay interval is symmetrically disposed above and below
the set temperature, e.g., in the cooling mode, if the set temperature is 21
℃
, the delay interval is 2
℃
,
then the controlled object will send an "on" or "100%" telegram at 22
℃
, and open the valve for cooling.
When the temperature drops to 20
℃
, the controlled object will send an "off” or "0%" telegram-, and
close the valve to stop cooling. Temperature setpoint is the temperature set under current working mode.
If you choose "fan coil Control", the type of communication object of control value will be the same
with that of "Continuous PI Control". In addition, the page "Fan Coil Heating / Cooling" is visible.
Different control types have different parameters and object, but most of them are similar. In order
not to repeat the description of these similar parameters, we do not make distinguish description of
parameters of different controlling types. If one type of control does not have some parameter, then it
does not have the function of the parameter.