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Siemens Basic Documentation RVP340, RVP350, RVP351 CE1P2545en
Building Technologies 11 Function block: Boiler 15.03.2011
released. The first stage continues to operate. If the flow temperature drops again,
the second stage is switched on again at x < w 0.5
*
SD. Now, the setpoint is
maintained with the help of the second burner stage.
If, however, the flow temperature continues to rise (x > w + 0.5
*
SD), the controller
starts generating the reset integral. It determines for how long and to what extent
the flow temperature remains above the setpoint by half the switching differential. It
continuously generates the reset integral based on the progression of temperature
and time. When the reset integral reaches the set maximum limit, the second
burner stage is locked and the first stage is shut down.
The minimum locking time and calculation of the release integral at x < w 0.5
*
SD are started when the switch-on command for the first burner stage is given.
Due to the time-temperature integral, it is not only the duration of the deviation that
is considered but also its extent when deciding whether the second stage shall be
released or locked.
SD Switching differential
w Boiler temperature setpoint
x Actual value of boiler temperature
1
0
INT
max.
FG
B2
1
0
Y
B2
t
FGI
RSI
2522D09
0
1
0
t
t
t
t
Y
B1
max.
T
Kw
+ 0,5
*
SD
T
Kw
- 0,5
*
SD
T
Kx
RSI
FG
B2
Release for burner stage 2 t Time
FGI Release integral T
Kw
Boiler temperature setpoint
INT Integral T
Kx
Actual value of boiler temperature
RSI Reset integral Y
B1
Control signal for burner stage 1
SD Switching differential Y
B2
Control signal for burner stage 2
11.4.3 Frost protection for the boiler
Frost protection for the boiler operates with fixed values:
Switch-on point: 5 °C boiler temperature.
Switch-off point: Minimum limit of boiler temperature plus switching differential.
48


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