Table of Contents
Advertisement
7
Operation
7.1
Cascade control
Fig.122
Cascade numbering
A
Fig.123
Traditional cascade control man
agement
4
+3K
-3K
3
2
1
0
4
8
Fig.124
Parallel cascade control manage
ment
2
+3K
-3K
1
0
4
8
7667004 - v.01 - 12072017
Up to 7 boilers equipped with the Inicontrol 2 can be managed in cascade
with the Diematic Evolution mounted in the master boiler. The system sen
sor is connected on the master boiler. All the boilers from the cascade are
connected by a S-BUS cable. The boilers are automatically numbered:
B
C
There are two options for cascade control management:
Adding supplementary boilers successively (traditional control).
Adding supplementary boilers simultaneously (parallel control).
AD-3000964-01
5
6
x
4
8
AD-3000960-01
3
4
Cascade algorithm type temperature, the setpoint sent to the running boil
er is :
Power; requested by the zones.
Temperature; flow setpoint requested by the zones + error caculation.
Cascade algorithm type power, the setpoint sent to the running boiler is :
x
4
8
AD-3000961-01
Power; accordingly PI algorithms.
Temperature; -90°C
A The master boiler is number 1.
B The first slave boiler is number 3 (number 2 does not exist).
C The second slave boiler is number 4; and so on.
1 First boiler starts running when system temperature is 3°C below
set point.
2 After 4 minutes the second boiler starts running if ΔT< 6K and the
system temperature is still more than 3°C below set point.
3 After 8 minutes the third boiler starts running if ΔT< 6K and the
system temperature is still more than 3°C below set point.
4 First boiler stops running when system temperature is 3°C above
set point.
5 After 4 minutes the second boiler stops running if ΔT< 6K and the
system temperature is still more than 3°C above set point.
6 After 8 minutes the third boiler stops running if ΔT< 6K and the
system temperature is still more than 3°C above set point.
1 All boilers in cascade start running when system temperature is
3°C below set point.
2 First boiler stops running when system temperature is 3°C above
set point.
3 After 4 minutes the second boiler stops running if ΔT< 6K and the
system temperature is still more than 3°C above set point.
4 After 8 minutes the third boiler stops running if ΔT< 6K and the
system temperature is still more than 3°C above set point.
7 Operation
25
Advertisement
Table of Contents
