99
15.2.8 P
OWER MODE
2
–
M
AXIMUM BURNERS ON
Power mode 2 is designed to have as many depending burners on as possible. When the average burner power
of the active depending burners is above a set minimum power, another burner is started
Burner start-up
The next burner is started under the following conditions:
• When the average burner power of all depending burners is over the set minimum burner power + hysteresis.
o Sum of burner power of all depending [%] > minimum_power [%] * (depending in burn + 1) +
minimum_power_hysteresis.
Burner shut down
The last started burner will be stopped under the following conditions:
• When the average burner power of all depending burners is under the set minimum burner power.
o Sum of burner power of all depending [%] < minimum_power [%] * depending in burn.
Relevant variables
Specific Parameters
Level
(Default) Value
Range
Power_Mode
2: Installer
2
0…3
Minimum_Power
Minimum average boiler power setting
2: Installer
20%
1...100%
Minimum_Power_Hysteresis
Hysteresis for the minimum average burner power setting
2: Installer
40%
1...100%
15.2.9 P
OWER MODE
3
–
B
ALANCED BURNERS ON
Power mode 3 is designed to have a balanced water flow in systems with a header/manifold.
Burner start-up
The next burner is started under the following conditions:
• When the average burner power of all depending burners is over the set start rate for the next burner.
o Sum of burner power of all depending [%] > Start_Power_Threshold [%] * depending in burn.
Burner shut down
The last started burner will be stopped under the following conditions:
• When the average burner power of all depending burners is under the set stop rate for the next burner.
o Sum of burner power of all depending [%] < S Start_Power_Threshold [%] * depending in burn.
Relevant variables
Specific Parameters
Level
(Default) Value
Range
Power_Mode
2: Installer
2
0, 1, 2, 3
Start_Power_Threshold
Threshold rate before start the next burner. Condition:
at least 1 depending in burn state power [%] >
Start_Power_Threshold[%]
2: Installer
80%
1…100%
Stop_Power_Threshold
Threshold rate before start the next burner. Condition:
all depending in burn state Power [%] <
Stop_Power_Threshold [%]
2: Installer
25%.
1…100%
Start_Next_Depending_Delay
When the timeout is over the last dependent can be
started
2: Installer
200 sec.
0…1275 sec.
Stop_Next_Depending_Delay
When the timeout is over the last boiler can be stopped
2: Installer
180 sec.
0…1275 sec.
Hyst_Up_Stop_Burner
Hysteresis to stop burner. Condition: T_System above
Cascade_Se Hyst_Up_Stop_Burner
2: Installer
5 sec.
9 sec.
0…20 sec. 0…36 sec.
Hyst_Down_Start_Burner
Hysteresis to start burner. Condition: T_System below
Cascade_Setpoint - Hyst_Down_Start_Burner
2: Installer
5 sec.
9 sec.
0…20 sec. 0…36 sec.
Содержание S-CBX 105
Страница 2: ......
Страница 40: ...40 9 10 Flue Terminal Positioning ...
Страница 42: ...42 9 11 1 FIGURE 12 LINE G ...
Страница 55: ...55 11 5 Ladder Logic Diagram ...
Страница 56: ...56 11 6 Electrical schematics ...
Страница 57: ...57 ...
Страница 137: ......