A
Master appliance is number 1
B
The first slave appliance is number 3 (number 2 does not exist).
C
The second slave appliance is number 4; and so on.
There are two options for cascade control management:
Adding supplementary appliances successively (traditional control)
Adding supplementary appliances simultaneously (parallel control)
1 First appliance starts running when system temperature is 3°C
below setpoint.
2 After 4 minutes the second appliance starts running if ΔT< 6K and
the system temperature is still more than 3°C below setpoint.
3 After 8 minutes the third appliance starts running if ΔT< 6K and the
system temperature is still more than 3°C below setpoint.
4 First appliance stops running when system temperature is 3°C
above setpoint.
5 After 4 minutes the second appliance stops running if ΔT< 6K and
the system temperature is still more than 3°C above setpoint.
6 After 8 minutes the third appliance stops running if ΔT< 6K and the
system temperature is still more than 3°C above setpoint.
1 All appliances in cascade start running when system temperature
is 3°C below setpoint.
2 First appliance stops running when system temperature is 3°C
above setpoint.
3 After 4 minutes the second appliance stops running if ΔT< 6K and
the system temperature is still more than 3°C above setpoint.
4 After 8 minutes the third appliance stops running if ΔT< 6K and the
system temperature is still more than 3°C above setpoint.
Temperature type cascade algorithm; the setpoint sent to the running
appliance is:
Output; requested by the zones.
Temperature; output setpoint requested by the zones + error calculation.
Output type cascade algorithm; the setpoint sent to the running boiler is:
Output; according to PI algorithms.
Temperature; -90°C
Required components
The required components depends on required cascade configuration.
Tab.76 Required components
Components
Details
SCB-10
For cascade master control.
PCB with S-BUS connection
(e.g. GTW-25, CB-01)
For slave connection per slave appliance.
S-BUS cable
Cable to connect the appliances via the S-BUS connections.
Terminator connector
120 Ohm / 0,5 Watt. Connect the terminator resistor on the first and the last S-BUS connection
in the cascade.
Cascade set
Depending on the cascade configuration.
Hardware configuration
Connect the required cascade components according the given
instructions.
Fig.99
Cascade numbering
AD-3000964-01
B
C
A
Fig.100 Traditional cascade control
management
AD-3000960-02
4
0
8
4
x
8
-3K
+3K
T
T
T
T
6
5
4
1
2
3
Fig.101 Parallel cascade control
management
AD-3000961-02
4
0
8
4
x
8
-3K
+3K
T
T
T
T
4
3
2
1
9 Installer instructions
86
C 340 / C 640
7762666 - v.02 - 29092020
