| 4.7.4 | Single duct | |
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Single duct, | In single duct applications, the controller controls an actuator (valve, damper, VAV | ||
heating or cooling | system, etc) | ||
| – | in heating/cooling mode with changeover (automatic or manual), | |
| – | heating only mode, | |
| – | or cooling only mode. | |
Cooling only is factory set (P01=1).
The output signal for the air flow can be limited to a minimum and maximum value if required (see section 4.6 "additional features").
Modulating control 3-position, PWM or DC 0 … 10 V
The diagram below shows the control sequence for continuous PI control.
Heating only (P01 = 0) |
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Y10 | XpH |
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| H |
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100% |
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Vmax |
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| max |
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Vmin |
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| min |
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0% |
| W | TR [°C] |
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Changeover (P01 = 2, 3) |
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| Changeover |
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Y10 | XpH | XpC |
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| H | C | ||
100% |
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Vmax |
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|
| max |
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|
| |
Vmin |
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|
| min |
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|
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0% |
| W |
| TR [°C] |
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|
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Cooling only (P01 = 1) |
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Y10 |
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XpC | C | |
100% | ||
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Vmax | max | |
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Vmin | min | |
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0% |
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W | TR [°C] |
T[°C] | Room temperature | XpH | Proportional band “Heating” |
w | Room temperature setpoint | XpC | Proportional band “Cooling” |
Y10 | Control command “Valve” | Vmin | Min. limitation for output |
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| Vmax | Max. limitation for output |
Note The diagrams show the PI controller’s proportional part only.
Setting the sequence and the control outputs
Refer to sections 4.5 (applications), 4.7.1 (sequences) and 4.7.3 (outputs).
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Siemens | RDG100, RDG100T, RDG110, RDG140, RDG160 Basic Documentation | CE1P3182en |
Building Technologies | Functions | 28 May 2009 |