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Siemens Building Technologies
Basic Documentation RVP540 / RVP550
CE1P2488en
HVAC Products
Description of the EXP settings
18.10.2002
5.58 P-band of the heating circuit (Xp)
•
Adapting the control characteristic to the plant’s behavior (controlled system).
•
P-band of the PI controller can be adjusted
Setting the proportional band for control of the mixing valve actuator used for the heat-
ing circuit.
Setting range
Unit
Factory setting
1...100 K
24
The proportional band defines within which change of the control variable
Δ
x (
Δ
T of the
return) the whole correcting span y (valve travel) is traversed.
The smaller the proportional band, the greater the change of the manipulated variable
Δ
y at a given change of the control variable
Δ
x.
2392
Z
08
Tn
y
t
Xp
1
t
x
5.59 Integral action time of the heating circuit (Tn)
•
Adapting the control characteristic to the plant’s behavior (controlled system)
•
I-part of the PI controller can be adjusted
Setting the integral action time for control of the mixing valve actuator used for the
heating circuit.
Setting range
Unit
Factory setting
10...873 s
90
The integral action time is the period of time the controller’s I-part would require to pro-
duce the same change of the manipulated variable as the P-part
An adjustment of the integral action time changes the valve’s rate of response.
The longer the integral action time Tn, the slower the response of the controlled sys-
tem.
For graph, refer to operating line 711
EXP
.
Benefit
Description
Setting
Effect
Example
Benefit
Description
Setting
Effect
