Two-Position Controller For Heating And Cooling (Example 4) - Siemens SIPART DR24 Manual

7 User Examples

7.4 Two-position Controller for Heating and Cooling (Example 4)

7.4 Two-position Controller for Heating and Cooling (Example 4)
D Problem
Two function blocks "split range" and two function blocks "pulse width modulation" follow a
continuous PID controller (see example 3) for the heating and cooling outputs.
PID controller
SPR
y
SPR
- Interfaces of the multi--function unit to the process:
See example 3 additional 2 digital outputs BA
- Equipment required
Standard SIPART DR24 controller
Front assignment see example 3
Cooling:
Complex functions: SPr2 and PUM2
Section y = SPE (0 %) to SPA (cooling), --Δy
Period: tM from 0.1 to 1000 s
Minimum pulse length: tAE
Regulation
ratio
h0
1
Cooling --Δy
0.5
0 %
SPE
On
Off
tM
Cooling, example with
regulation ratio = 50 %
188
PUM
PUM
50
Dead zone: no regulating pulses
SPA
35 %
tAE
tM
tM
Switching output (heating)
Switching output (cooling)
Heating:
Complex functions: SPr1 and PUM1
Section y = SPA to SPE (100 %, heating), +Δy
Period: tM from 0.1 to 1000 s
Minimum pulse length: tAE
Heating +Δy
50
SPA 40 %
0
tAE
tM
Heating, example with
regulation ratio = 50 %
Manual
h0
1
0.5
y
100 %
SPE
On
Off
SIPART DR24 6DR2410
C79000-G7476-C153-03