ABB i-bus KNX Product Manual page 81

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ABB i-bus KNX
Parameters
7.6.6.1.2 PI continuous (0...100%), PI PWM (On/Off)
The following parameters are enabled if the PI continuous (0...100%), PI PWM (On/Off) option has been
selected in the Basic-stage heating control value type parameter.
7.6.6.1.2.1 —
Dependent parameter
I-proportion
Options:
The standard value depends on the option selected in the Basic-stage heating parameter in the
Application parameters parameter window.
The I-proportion stands for the integral time in a control. The integral proportion causes the room
temperature to approach the setpoint slowly and also to reach it finally. Depending on the system type
used, the integral time may need to have different values. In principle the following applies: The more
sluggish the overall system, the larger the integral time is.
7.6.6.1.2.2 —
Dependent parameter
P-proportion
Options:
The standard value depends on the option selected in the Basic-stage heating parameter in the
Application parameters parameter window.
The P-proportion stands for the proportional range in a control. It fluctuates around the setpoint and in a PI
control is used to change the speed of the control. The smaller the value set, the faster the control reacts.
However, the value should not be set too small because otherwise there may be a risk of overshoot.
7.6.6.1.2.3 —
Dependent parameter
Extended settings
Options:
0...100...255 min
01.0...01.0...10.0 K
No
Yes
VC/S 4.x.1 | 2CDC508220D0211 Rev. A 79