MYLOS
®
Building Automation |
Planning and use 69
MYLOS
®
Building Automation
Planning and use
7.3.3 PWM controller
The PWM controller has the same continuous control as a continuous controller. The only difference is that with a
PWM controller the 1-byte control value (0...255) is converted to a on/off ratio (0 and 1). For example, if a control value
of 70% is output, the make time will be 7 minutes and the break time 3 minutes at a default cycle time of 10 minutes.
This transfers the advantages of continuous control (control to the desired setpoint, no oscillations) to drives that
are designed for on/off signals only, such as electrothermal drives.
T
21 ûC
Sollwert
Istwert
t
1
=30%
=30%
=40%
^
^
=50% ^
=70% ^
^
0
t
10 min
Continuous room heating or cooling in spite of the ON/OFF value of the
control value depends on the thermal inertia of the heating or cooling element.
