Figure 8.7
Engine stop sequence for a stop coil system
t1
t2
*
Stop
Stop coil
Cooldown
Running
detection
(1)
(3)
(4)
(2)
Figure 8.8
Engine stop sequence for a run coil system
t1
*
Stop
Run coil
Cooldown
Running
detection
(1)
(3)
(4)
(2)
t2
t1 Cooldown (
Configure > Parameters > Engine > Stop sequence > Cooldown > Normal
)
t2 Extended stop (
Configure > Parameters > Engine > Stop sequence > Extended stop > Stop coil activated
)
*
Up to this point, the engine can be restarted immediately, without completing the stop sequence.
1.
Stop
. The stop command can come from the controller, an operator, or an external source. See the
Engine stop flowchart
for
more information.
2.
Cooldown
(optional). The controller allows the genset to run for the time configured. There is no cooldown for shutdowns, an
emergency stop, or an operator stop by pressing the engine stop push-button again. Temperature-dependent cooldown is also
possible (see below).
3.
Stop engine
:
•
Stop coil
:
Engine > Stop coil
(digital output). The controller activates the stop coil digital output until running feedback is
OFF. The controller then keeps the stop coil activated for the time in the (optional)
Extended stop
parameter.
•
Run coil
:
Engine > Run coil
(digital output). The controller deactivates the run coil digital output after the cooldown period.
The genset cannot restart during the time in the (optional)
Extended stop
parameter.
4.
Running detection
. When the running detection is OFF, the controller regards the engine as stopped.
Temperature-dependent cooldown
Temperature-dependent cooldown stops the engine cooldown when the engine coolant water temperature reaches the configured
threshold before the cooldown timer expires. The cooldown can be shorter than when just a timer is used, which reduces fuel use.
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