GVS K-BUS
○
R
KNX/EIB
Thermostat
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39
Options: 0 ... 255
In the parameter "control parameter of heating / cooling system",when the option is "user-defined
parameter", this parameter is visible and is used to set parameter values of I (integral time).The integral
time must be appropriately set. If it is too large it will make adjustment very slow and oscillation
unobvious.If it is too small it will cause adjustment very fast and oscillation.0 means not using integral
term.
Parameters "invert control value"
Options: no
yes
Here it sets the method of control object sending control value,
normal transmit or negative transmit, to suit
control value to the type of valve.
If you select "no", the control object "Heating / Cooling control value “will send normal control
values.
If you select "yes", control object "Heating / Cooling control value" will send negative control value. If
control value is "off or 0%," negative control value will be "on or 100%"; If control value is "on, or 100%,"
negative control is "off or 0%"; If control value is "60%", then negative control value is 40%.
Parameters "minimum control value in%"
Options: 0 ... 30
This parameter is used to set the minimum allowable value of the PI control value. When control
value calculated from PI is less than the set minimum value, Thermostat will send the minimum 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 small, it will cause the valve open for a
very short time and close for very long, it may be not long enough to open the valve, thus will not make a
good regulation of room temperature and the valve will be easily damaged.
Parameter "maximum control value in%"
Options: 70 ... 100
