
Technical Manual
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Central Operation Unit Smart
MDT technologies GmbH •
51766 Engelskirchen • Papiermühle 1
Phone: +49-2263-
880 • Fax: +49-2263-4588 • [email protected] • www.mdt.de
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In PWM control, the controller switches the control value according to the value calculated in PI
control, taking into account the cycle time. The control value is thus converted into pulse width
modulation (PWM).
PWM cycle time
The PWM cycle time is used for PWM control to calculate the switch-on and switch-off pulse of the
control value. This calculation is based on the calculated control value. A PWM cycle comprises the
total time from the switch-on point to the new switch-on point.
Example:
If a control value of 75% is calculated with a set cycle time of 10 minutes, the control value is
switched on for 7.5 minutes and switched off for 2.5 minutes.
In principle, the slower the overall system, the longer the cycle time can be set.