Bedienungsanleitung Siemens RVP351 (Seite 47 von 108) (Englisch)

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Siemens Basic Documentation RVP340, RVP350, RVP351 CE1P2545en

Building Technologies 11 Function block: Boiler 15.03.2011

If there is no more deviation before the minimum burner running time has elapsed,

the burner will nevertheless continue to operate until that time has elapsed (burner

cycling protection). This means that the minimum burner running time has priority.

Maximum limitation of the boiler temperature is maintained, however, which always

leads to burner shutdown.

+ 0,5

2522D14

- 0,5

SD Switching differential T

Boiler temperature setpoint

t Time T

Actual value of boiler temperature

Boiler temperature Y

Burner control signal

Note on setting: When controlling a 1-stage burner, the reset integral of the second

stage should be set to zero.

11.4.2 Control with 2-stage burner

For 2-position control with a 2-stage burner, the variables that can be set are the

switching differential and the minimum burner running time – the latter now apply-

ing to both stages – plus the following variables:

 The release integral (FGI) for the second stage. This is the variable generated

from the progression of temperature (T) and time (t). If the maximum limit is ex-

ceeded, the second burner stage is released and can be switched on. Prerequi-

site is that the minimum locking time for the second stage has elapsed.

FGI =





dtT

where: T = ( w  0.5

SD  x ) > 0

 The reset integral (RSI). This is a variable generated from the progression of

temperature and time. If the maximum limit is exceeded, the burner is locked

and shuts down.

RSI =





dtT

where: T = ( x  w + 0.5

SD ) > 0

 The minimum locking time for the second stage, which is the period of time on

completion of which the second stage can switch on at the earliest

The controller compares the actual value of the flow temperature with the setpoint.

If it falls by half the switching differential (x < w  0.5

SD) below the setpoint, the

first burner stage is switched on. At the same time, the minimum waiting time for

the second burner stage commences and the release integral is being generated.

The controller ascertains for how long and by how much the flow temperature re-

mains below w  0.5

SD. It continuously generates the integral based on the pro-

gression of temperature and time.

If, on completion of the minimum locking time, the flow temperature lies below

w  0.5

SD, and the release integral reaches the set maximum limit, the second

burner stage is released and switched on. The flow temperature rises.

If the flow temperature exceeds the setpoint by half the switching differential

(x = w + 0.5

SD), the second burner stage is switched off again, but remains

Setting parameters

Control process

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