Technical Manual Temperature Controller
MDT technologies GmbH •
51766 Engelskirchen • Papiermühle 1
Tel.: +49-2263-
880 • Fax: +49
-2263-4588
• [email protected] • www.mdt.de
41
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.
“o the o t ol alue is o e ted to a pulse idth odulatio ith o l the t o o ditio s
a d
.
4.5.3.1 PWM cycletime
The
leti e, „PWM
leti e , se es the o t olli g fo al ulati g the le gth of the o
-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.
Cooling system
Split Unit (4K/90min)
Cooling ceiling (5K/240 min)
Adjustment via control
parameter
Adjustment of the used cooling system
Individual parameterization available by
Adjust e t ia o t ol pa a ete
Proportional range (K)
1K-8K
[2K]
By choosing heating/cooling system as
Adjust e t ia o t ol pa a ete , the
proportional range can be
parameterized freely
Reset time (min)
15min
–
210 min
[150 min]
By choosing heating/cooling system as
Adjust e t ia o t ol pa a ete , the
reset time can be parameterized freely
Send control value cyclic
Disable, 1 min, 2min, 3min, 4 min,
5min, 10min, 15min, 20min, 30min,
40min, 50min, 60min
[Disable]
Activation of cyclic sending of the
control value with adjustment of the
cyclic time
Use additional level
No
Yes
Activation of an additional level
available, only for heating (4.5.6)
PWM cycletime (min)
5min, 10min, 15min, 20min, 25min,
30min
[10min]
describes the whole time off an on-
pulse and an off-pulse
