Beretta 20141085, Installation Manual, Page: 87 / 112

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4.3 Operation with the primary sensor
The system sensor present on the primary system (see block dia-
grams 1 and 3) allows the setpoint sent to the individual modules to
be modulated on the basis of the difference between the setpoint and
the value read on the delivery manifold of the primary system.
The following parameters regulate this modulation:
79
defines the maximum setpoint decrease
80
defines the maximum setpoint increase
81
defines the time (from the start of the request) from which the
setpoint modulation is started
86 proportional parameter for setpoint modulation
87
integrative parameter for setpoint modulation
4.4 Operation with the secondary sensor
When the secondary system is present (see block diagrams 2 and
4), the setpoint sent to the individual modules to be modulated on the
basis of the difference between the setpoint and the value read on the
delivery manifold of the secondary system.
In the same way that modulation is based on the system sensor, the
following parameters intervene:
169
defines the maximum setpoint decrease
170
defines the maximum setpoint increase
171
defines the time (from the start of the request) from which the
setpoint modulation is started
176 defines the proportional term for setpoint modulation
177
defines the integrative term for setpoint modulation
4.5 Parameter 148: operating mode of the
cascade
It is possible to adopt cascade management which can be modified
according to different strategies. These different strategies can be set
using the parameter known as "Cascade mode" Par. 148.
4.5.1 Par 148 = 0
The start-up/shutdown law of each module is based on the following
graph.
The shut-off values of the lines with the y axis are the sum or the dif-
ference of the values of the corresponding parameter in relation to
the value of the setpoint sent by the Manging module to the modules.
Setp + Par 146
Clear Demand
(no time)
Remove Depending faster
Time = Par 143
Remove depending
Time = Par 76
Power Balance
Add Depending
Time = Par 75
Add Depending faster
Time = Par 142
Setp + Par 145
Setp - Par 144
Setp + Par 78
Setpoint
Setp - Par 77
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