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Fig.24
Traditional cascade control
management
4
+3K
-3K
3
2
1
0
4
8
T
T
Fig.25
Parallel cascade control
management
2
+3K
-3K
1
0
4
8
T
T
5
Installation examples
5.1
The SCB-01 expansion PCB
Fig.26
SCB-01 PCB
Status
Status
Nc
C
No
Nc
7837115 - v.01 - 10012023
5
6
x
4
8
T
T
AD-3000960-02
3
4
x
4
8
T
T
AD-3000961-02
0-10
C
No
0
+
AD-3001514-01
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.
T Duration between start and stop of boilers can be changed with
parameter NP009.
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.
T Duration between start and stop of boilers can be changed with
parameter NP009.
Temperature type cascade algorithm; the setpoint sent to the running
boiler 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
The type of cascade algorithm can be changed with parameter NP011.
The SCB-01 has the following features:
Two potential free contacts for status notifications
0–10 V output connection for a PWM system pump
Expansion PCBs are automatically recognised by the control unit of the
boiler. If expansion PCBs are removed, the boiler will show an error code.
To resolve this error, an auto-detect must be carried out after removal.
5 Installation examples
21
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