Engine start sequence for a run coil system
In this example, the Engine > Start sequence > Run coil > During start attempts parameter is set to Follow crank. The engine
speed (RPM measurement) and/or the Remove start (release crank relay) digital input do not disengage the crank before there is
Running detection.
Table 8.14
Successful engine start sequence for a run coil system
1
t2
t1
Start
attempts
Run coil
Running
detection
Crank
(1)
(2)
(3)
(4)
t1 = Run coil before crank (optional)
t2 = Crank on (Parameters > Engine > Start sequence > Crank > Crank on)
1. Start attempts: The engine starts during the first start attempt.
2. Run coil: Engine > Run coil (digital output). The controller activates the
Run coil at the time in the Run coil before crank parameter. If Running
detection is ON, the engine is regarded as started, and the Run coil
remains activated.
3. Crank: Engine > Crank (digital output). The controller activates the Crank
output. If Running detection changes from OFF to ON, cranking stops.
4. Running detection. The engine is regarded as started when Running
detection is ON.
Figure 8.6
Failure of engine start sequence for a run coil system
1 2 3
t3
t2
t1
Start
attempts
Run coil
Running
detection
Crank
(1)
(2)
(3)
(4)
Start failure
(5)
t1 Run coil before crank (optional)
t2 Crank on (Parameters > Engine > Start sequence > Crank > Crank on)
t3 Crank off (Parameters > Engine > Start sequence > Crank > Crank off)
1. Start attempts: Parameters > Engine > Start sequence > Start attempts > Normal = 3.
2. Run coil: Engine > Run coil (digital output). The controller activates the Run coil at the time in the Run coil before crank
parameter. If Running detection is still OFF after cranking, the controller deactivates the Run coil for the time in the Crank off
parameter. This ensures that the engine is stopped if the engine start was not detected. The engine cannot be started during the
Crank off time.
3. Crank: Engine > Crank (digital output). The controller activates the Crank output for the Crank on time, and deactivates it for
Crank off time.
4. Running detection. There is no running detection.
5. Start failure. The controller activates the Start failure alarm after the last unsuccessful start attempt.
Start prepare (optional)
You can use the optional Engine > Start prepare digital output with a stop coil or a run coil system.
DESIGNER'S HANDBOOK 4189340911K UK Page 294 of 521
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