Technichal Manual Heating Actuators AKH
MDT technologies GmbH •
51766 Engelskirchen
• Papiermühle 1
Tel.: +49-2263-
880 • Fax: +49
-2263-4588
• [email protected] • www.mdt.de
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4.4.1 PWM cycletime
The PWM cycletime is used for calculating the on and off pulses of the control value. This calculation
is based on the incoming control value. A PWM cycle includes the whole time which elapses from
one switch-on pulse to the next.
Example:
If a control value of 75% is calculated and PWM cycletime of 10min is
adjusted, the control value will be switched on for 7.5min and switched off for
2.5min.
The dynamic range of the PWM cycletime is shown at the following chart:
Sub function
Dynamic range
[default value]
comment
PWM cycletime
i ,
i , …,
i ,
i ,
20min, 25min, 30min
[10min]
Adjustment of the PWM cycletime
Table 31: PWM cycletime
In principle, two different options of adjusting the PWM cycletime enforced. On the one hand the
setting in which the valves open completely and close completely during one cycle. And on the other
hand the setting in which the cycletime is much less than the adjustment time of the valves and so a
average position of the valves is adjusted.
Both adjustment options and the usage of them are shown at the following section. If more than one
valve is adjusted, it is recommended to adjust to the slowest one.
