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CASCADE CONNECTION
4.2.1
Bus connection
The bus connections are made on the MANAGING "M01" low voltage terminal blocks of the connected thermal modules in cascade.
Heating module 1
Heating module 2
M
D
D
D
m
1
2
3
S1=ON
S1=OFF
S1=OFF
S1=OFF
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9 10
9 10
11 12 13 14
11 12 13 14
15 16 17 18
15 16 17 18
19 20 21 22
19 20 21 22
1
2
3
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9 10
9 10
11 12 13 14
11 12 13 14
15 16 17 18
15 16 17 18
19 20 21 22
19 20 21 22
1
2
3
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11 12 13 14
11 12 13 14
15 16 17 18
15 16 17 18
19 20 21 22
19 20 21 22
1
2
3
N.B. The cable marked with a dotted line is the one joining BUS 2 on the first managing unit (Mm) with BUS 2 on the second man-
aging unit (Md) (connect terminal 19 to 19 and 20 to 20). Connect the system sensor (T_syst_2) to terminals 13 and 14 on the Mm.
4.2.2
Setting the main parameters
Some parameters are essential in order for the system to operate in cascade and setting these parameters is a determining factor
for correct system operation.
Par.73
Parameter 73 must be set as follows:
− On the Mm module, set: Managing
− On the Md module, set: DEP 1
Typical parameters for a cascade of cascades
The parameters below are specific to controlling a cascade of a cascades. All of these parameters must be set on the Mm.
The parameter 167 is used for defining the number of direct cascades connected together to form a cascade of cascades.
This parameter must be set on the Mm. In the example shown, the following must be set:
− Parameter 167 = 2
The parameters 158,159, 160 and 161 must be set using the formula below:
− Par. 158 = Par. 75*(N+1)
− Par. 159 = Par. 76*(N+1)
− Par. 160 = Par. 142*(N+1)
− Par. 161 = Par. 143*(N+1)
Where N is the number of modules in the cascade connected to the Mm.
Heating module 3
D
D
M
D
D
4
5
d
1
2
S1=OFF
S1=OFF
S1=OFF
S1=OFF
S1=OFF
4
5
6
7
8
9 10
11 12 13 14
15 16 17 18
19 20 21 22
1
2
3
4
5
6
7
8
9 10
11 12 13 14
15 16 17 18
4
5
6
7
8
9 10
11 12 13 14
15 16 17 18
19 20 21 22
1
2
3
4
5
6
7
8
9 10
11 12 13 14
15 16 17 18
4
5
6
7
8
9
10
11 12 13 14
15 16 17 18
19 20 21 22
1
2
3
4
5
6
7
8
9
10
11 12 13 14
15 16 17 18
94
4.3
Operation with the primary sensor
The system sensor present on the primary system (see block di-
agrams 1 and 3) allows the setpoint sent to the individual mod-
ules 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
D
which the setpoint modulation is started
3
86
proportional parameter for setpoint modulation
87
integrative parameter for setpoint modulation
S1=OFF
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 modulat-
ed 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:
19 20 21 22
169
defines the maximum setpoint decrease
170
defines the maximum setpoint increase
171
defines the time (from the start of the request) from
19 20 21 22
which the setpoint modulation is started
19 20 21 22
176
defines the proportional term for setpoint modulation
177
defines the integrative term for setpoint modulation
CASCADE CONNECTION
4.5
Parameter 148: operating mode of the
cascade
It is possible to adopt cascade management which can be mod-
ified 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 fol-
lowing graph.
The shut-off values of the lines with the y axis are the sum or
the difference of the values of the corresponding parameter in
relation to the value of the setpoint sent by the Manging module
to the modules.
Clear Demand
(no time)
Setp + Par 146
Remove Depending faster
Time = Par 143
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
Setp + Par 145
Remove depending
-1
-1
-1
-1
Time = Par 76
Setp + Par 78
Setpoint
Power Balance
Setp - Par 77
Add Depending
-1
-1
-1
-1
Time = Par 75
Setp - Par 144
Add Depending faster
+1
+1
+1
+1
+1
+1
+1
+1
+1
+1
+1
+1
+1
+1
+1
+1
Time = Par 142
95
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