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ABB i-bus
®
KNX
Planning and application
FCC/S 1.X.X.1 | 2CDC 508 200 D0211 Rev A 368
Fig. 65: Example
2CDC072009F0118
12.5.1.1.2
Calculation
With pulse width modulation, control is implemented by a variable mark-space ratio.
Fig. 66: Calculation
2CDC072008F0118
During the time t
ON
the valve is opened and during the time t
OFF
it is closed.
On account of t
ON
= 0.4 x t
CYC
the valve is set to about 40 %. t
CYC
is the so-called PWM cycle time
for continuous control.