Siemens RVA63.280 - Temperature-Time Integral

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Siemens Building Technologies Basic Dokumentation RVA63.280, RVA53.280 CE1P2374E
Landis & Staefa Division 19.04.2001
2.42.3 Temperature-time integral
This temperature-time integral generates the locking signal for restricting the heating
circuits.
Diagram Procedure
a to b Within a foreseeable period of time, the actual boiler temperature (TKx)
will not lie within half the switching differential of the boiler temperature
setpoint.
è
èè
è Locking signal will be built up
btoc,
dtoe
Within a foreseeable period of time, the actual boiler temperature (TKx)
will lie within half the switching differential of the boiler temperature
setpoint.
è
èè
è Locking signal will remain at a constant level
ctod,
etof
Within a foreseeable period of time, the actual boiler temperature (TKx)
will lie above TKw.
è
èè
è Locking signal will be decreased
f
The actual boiler temperature (TKx) exceeds the boiler temperature
setpoint.
è
èè
è Locking signal will be set to 0 %.
TKx
2378Z11
t
a b
TK
TKw
0%
t
y
x%
cd ef
SDK/2
a Start of d.h.w. heating
TK boiler temperature
TKw Boiler temperature setpoint
TKx Actual value of the boiler temperature
SDK Switching differential of the boiler
tTime
Y Locking signal
Diagram