ABB i-bus FCC/S 1 1 Series Product Manual page 189

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ABB i-bus KNX
Parameters
—
7.5.1.7.1.2.5.4 Dependent Parameter
Heating PWM cycle
This parameter is only visible on the selection of the PI PWM (On/Off) option.
Options:
Using the value set here, the cycle time for the control value for the PWM signal calculated from
the PI controller's control value is specified. Depending on the control value, the selected cycle
time is divided into an On and Off signal.
Therefore, a control value output of 33 % with a PWM cycle of 15 min signifies an On phase of five
minutes and an Off phase of 10 min.
The value is only sent if the control value changes (from 0 to 1 or vice versa).
At the start of a cycle a 1 is output and, corresponding to the control value, a 0 after the time x.
If the control value is 0 %, on reaching this control value a 0 is output once. The next value is
only sent if the control value changes.
Example:
Heating PWM cycle: 15 min
Control value: 33 %
Times
0 min
5 min
15 min
20 min
30 min
...
New control value: 0 %
Times
60 min
75 min
90 min
...
New control value: 66 %
Times
120 min
130 min
135 min
145 min
...
0...15...60
Note
Sent value
1
0
1
0
1
...
Sent value
0
–
–
...
Sent value
1
0
1
0
...
FCC/S 1.X.X.1 | 2CDC 508 200 D0211 Rev A 189