Cascade - Siemens AVS75.39 Series User Manual

Operating
mode/strategy
Lead strategy
Output band minimum /
maximum
Control
Integral generator
sequence
Release integral source
seq
Reset integral heat
source seq
Siemens
Building Technologies
6.10

Cascade

Line no. Operating line
3510 Lead strategy
Late on, early off ¦ Late on, late off ¦ Early on, late off
3511 Output band min
3512 Output band max
Late on, early off
Additional heat sources are switched on as late as possible (output band max) and
switched off again as early as possible (output band max). This means that the
smallest possible number of heat sources are in operation, or additional heat
sources operate with short on times.
Late on, late off
Additional heat sources are switched on as late as possible (output band max) and
switched off again as late as possible (output band min). This leads to the smallest
possible number of switch-on/off actions for the heat sources.
Early on, late off
Additional heat sources are switched on as early as possible (output band min) and
switched off again as late as possible (output band min). This means that the
largest possible number of heat sources are in operation, or additional heat
sources operate with the longest possible on times.
The values are used as switching on/off criteria according to the selected lead
strategy.
Line no. Operating line
3530 Release integral source seq
3531 Reset integral source seq
3532 Restart lock
3533 Switch on delay
3534 Forced time basic stage
The settings can be used in addition to the output range as switch-on or switch-off
criterion.
When, with the heat sources currently in operation, the amount of heat produced
falls short of demand by the release integral set here, another boiler will be
switched on.
When the value is increased, additional heat sources are switched on at a slower
rate.
When the value is decreased, additional heat sources are switched on at a faster
rate.
When, with the heat source currently in operation, the demand for heat is
exceeded by the reset integral set here, the heat source with the highest priority is
shut down.
When the value is increased, the generators operate for longer periods of time (in
the case of surplus heat).
When the value is decreased, the heat sources are switched off at a faster rate.
User manual RVS43.345
The settings in detail
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CE1U2354en_021
2013-09-02