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.
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