Siemens AVS75.39 Series User Manual page 95

Mixing valve Xp
Mixing valve Tn
Modulating preheat Tv
Siemens
Building Technologies
By setting the right proportional band Xp for the mixing valves actuator, the control
behavior of the actuator is matched to those of the plant (controlled system).
The proportional band Xp influences the controller's P-action.
The P band Xp is the range by which the input variable x (controlled variable) must
change to adjust the output variable y (manipulated variable) throughout the entire
positioning range. The smaller the value the greater the jump. The illustration
depicts the reciprocal value 1/Xp = Kp.
By setting the right integral action time Tn, the control action of the mixing valve's
actuator is matched to the behavior of the plant (controlled system).
Tn influences the controller's I-response.
It is the required of the I-portion to undertake the same manipulated variable
change at the given input signal (controlled variable), as immediately provided by
the P-portion. The smaller the Tn the larger/faster the slope.
By setting the right derivative action time, the control action of the mixing valve's
actuator is matched to the behavior of the plant (controlled system).
Tv influences the controller's D-behavior. With Tv = 0, the D-action is deactivated.
User manual RVS43.345
The settings in detail
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CE1U2354en_021
2013-09-02