Siemens AVS75.39 Series User Manual page 94

Multistage burner
Integrals for stage 2
Release integral of
burner stage 2
Reset integral of burner
stage 2
Modulating burner
(damper actuator/UX)
Damper actuator run time
Example
Positioning pulses
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Siemens
Building Technologies
Line no. Operating line
2220 Release integral stage2/mod
2221 Reset integral stage2/mod
The temperature-time integral is a continuous summation of the temperature
differential over the time. In this case, the decisive temperature differential is the
amount the temperature exceeds burner's switch-on or switch-off setpoint.
Through the generation of the temperature-time integral, it is not only the period of
time that is considered, but also the extent of the crossing. This means that when
the exceed is significant, burner stage 2 will be released or locked earlier than
when the exceed is small.
When, with burner stage 1, the temperature drops below the switch-on setpoint by
the release integral set here, the controller will release burner stage 2.
When, with burner stages 1 and 2, the temperature drops below the switch-off
setpoint by the reset integral set here, the controller will lock burner stage 2.
Line no. Operating line
2232 Damper actuator run time
2233 Modulating Xp
2234 Modulating Tn
2235 Modulating Tv
To ensure that control of the modulating burner works optimally, the damper
actuator running time must be set.
It must be noted that the running time to be set only relates to the range.
Running time of damper actuator (90°) = 120 seconds.
Minimum position of damper actuator = 20°.
Maximum position of damper actuator = 80°.
Hence, the damper actuator running time effective for the control is as follows:
120 s ( * 80 20 )
80
90
For control operation, running time-dependent minimum positioning pulses are
active that are defined as follows:
Actuator running time TS
7.5 s - 14.5 s
15 s - 29.5 s
30 s – 59.5 s
60 s – 119.5 s
>120 s
User manual RVS43.345
The settings in detail
s
Minimum pulse length
~ 200 ms
~ 300 ms
~ 500 ms
~ 1.10 s
~ 2.20 s
CE1U2354en_021
2013-09-02