7 User Examples
7.4 Two-position Controller for Heating and Cooling (Example 4)
Manual
188
SIPART DR24 6DR2410
C79000-G7476-C153-03
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.
y
Switching output (heating)
PID controller
SPR
SPR
PUM
PUM
Switching output (cooling)
- 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), --
Δ
y
Period: tM from 0.1 to 1000 s
Minimum pulse length: tAE
Heating:
Complex functions: SPr1 and PUM1
Section y = SPA to SPE (100 %, heating), +
Δ
y
Period: tM from 0.1 to 1000 s
Minimum pulse length: tAE
Regulation
ratio
Dead zone: no regulating pulses
Cooling --
Δ
y
H
Δ
y
1
0.5
0 %
SPE
SPA
Off
On
tAE
40 %
35 %
100 %
Cooling, example with
regulation ratio = 50 %
Heating, example with
regulation ratio = 50 %
y
h0
h0
50
50
SPA
tM
tM
tM
tM
1
0.5
Off
On
0
SPE
tAE
Содержание 6DR2410
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