Example: Running detection ON
The following sequence diagram is an example of how Running detection changes during an engine start. Running detection
changes from OFF to ON when one running feedback detects that the engine is running.
Figure 8.2 Running detection ON sequence diagram
Set point
Set point
Frequency
RPM
Digital
running
detection
(1)
(2)
(3)
Running
detection
(4)
1. Frequency: The engine starts and the frequency rises above the set point.
2. RPM: (MPU/W/NPN/PNP input). The engine starts and the RPM rises above the set point.
3. Digital running detection: Engine > Feedback > Digital running detection (digital input). In the example, the response of this
input is slower than the other running detection inputs.
4. Running detection: Running detection changes from OFF to ON when any running feedback (in this case, the frequency) rises
above the Detection set point.
Example: Running detection OFF
The following sequence diagram is an example of how Running detection changes during an engine stop. Running detection
changes from ON to OFF when none of the running feedbacks detect that the engine is running.
Figure 8.3
Running detection OFF sequence diagram
Set point
Set point
Frequency
RPM
Digital
running
detection
(1)
(2)
(3)
Running
detection
(4)
1. Frequency: The engine slows down and the frequency drops to 2 Hz below the set point.
2. RPM: (MPU/W/NPN/PNP input). The engine slows down and the RPM drops to 5 % below the set point.
3. Digital running detection: Engine > Feedback > Digital running detection (digital input). In the example, the response of this
input is slower than the other running detection inputs.
4. Running detection: Running detection changes from ON to OFF when none of the running feedbacks detect that the engine is
running.
DESIGNER'S HANDBOOK 4189340911K UK Page 286 of 521
To Next Page
Loading...
