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Technical Manual – Room Temperature Controller SCN-RT1
Cooling system
Proportional range (K)
Reset time (min)
Send control value cyclic
Use additional level
PWM cycletime (min)
Table 36: PI control switching (PWM)
At the pulse width modulation, the controller switches the control value according to the calculated
value of the continuous control on and off. Thereby the control watches also the adjusted cycletime.
So the control value is converted to a pulse width modulation with only the two conditions "0" and
"1".
4.5.3.1 PWM cycletime
The cycletime, „PWM cycletime", serves the controlling for calculating the length of the on-pulse and
the off-pulse. This calculation occurs at the base of the calculated continuous value in percent. One
PWM cycle contains the time, which elapses from one switching on point to the other.
Example: If a control value of 75% is calculated and a cycletime of 10min is adjusted, the
control value will be switched on for 7,5min and switched off for 2,5min.
In principle you can say each carrier the system, each bigger the cycletime.
MDT technologies GmbH • 51766 Engelskirchen • Papiermühle 1
36
Phone: +49-2263-880 • Fax: +49-2263-4588 • knx@mdt.de • www.mdt.de
▪ Split Unit (4K/90min)
▪ Cooling ceiling (5K/240 min)
▪ Adjustment via control
parameter
1K-8K
[2K]
15min – 210 min
[150 min]
Disable, 1 min, 2min, 3min, 4 min,
5min, 10min, 15min, 20min, 30min,
40min, 50min, 60min
[Disable]
▪ No
▪ Yes
5min, 10min, 15min, 20min, 25min,
30min
[10min]
Adjustment of the used cooling system
Individual parameterization available by
"Adjustment via control parameter"
By choosing heating/cooling system as
"Adjustment via control parameter", the
proportional range can be
parameterized freely
By choosing heating/cooling system as
"Adjustment via control parameter", the
reset time can be parameterized freely
Activation of cyclic sending of the
control value with adjustment of the
cyclic time
Activation of an additional level
available, only for heating (4.5.6)
describes the whole time off an on-
pulse and an off-pulse
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