Siemens LMS14 User Manual

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Building Technologies Division User Manual LMS14… CC1U7471en
6 The settings in detail 28.01.2015
6.12.7 Boiler control
Boiler control comprises all functions that translate a request (boiler temperature
setpoint) to an output signal (control of burner as a percentage).
Such functions include:
 Frost protection for the boiler
 2-position control
 Modulating control
 Limitation and output of manipulated variable
 Chimney sweep
 Controller stop
 Manual control
The boiler loop is in the form of a single temperature control loop.
Ts ol l TIstP
KK
PWMT

Strecke
T
T
K K
Strecke
Pv
n
Boiler
setpoint
Pneumatical /
electrical
ratio
Adjustment of
manipulated
variable
Setpoint preselection Controller
K Sensor Sensor
Figure 52: Boiler control – modulating control
Key
Line no. Meaning
KFühler Sensor characteristic
KP Controller gain 1/XP
KPWM Conversion factor for positioning signal
KStell Fan characteristic
KStrecke Gain of controlled system
TStrecke Temperature of controlled system
P Pressure
PWM Fan control
TFühler Temperature acquired by sensor
TIst Actual value of temperature
Tn Integral action time
Tsoll Temperature setpoint
Tv Derivative action time
Modulating control

Siemens LMS14 Specifications

General

Brand	Siemens
Model	LMS14
Category	Control Unit
Language	English