ABB i-bus
KNX
Planning and application
164 2CDC 505 056 D0208 | SA/S
4.3.4
Pulse width modulation – calculation
With pulse width modulation, control is implemented by a variable mark-space ratio.
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 % on. t
CYC
is the so-called PWM cycle time for continuous control.
Please note
Pulse width modulation leads to frequent switching of the outputs. The limited number of switching
operations with normal Switch Actuators should be considered! Electronic Switch Actuators should
preferably be used.
Содержание i-bus SA/S 2.6.2.1
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