2.10 Engine Synchronization (Twin Screw)
Engine Synchronization must be selected during Set Up to have automatic synchronization.
Synchronization is automatic and only operates when the Ahead clutch is engaged, consequently it can be
left ON full time. When synchronization has been selected during set up, the Control System will always
power-up with synchronization ON.
In order for synchronization to become active and work toward synchronizing the engines' RPM's, the
Synchronization Criteria listed below must be met.
2.10.1 Synchronization Criteria
• Both Control Heads must be commanding 5% or greater of the throttle range.
• The Control Head levers must be within 10% of one another (+/- approximately 6 degrees).
• Both Control Head levers are commanding Ahead clutch engagement.
2.10.2 Synchronization Types
The following types of synchronization use the same criteria, indications, and are turned ON and OFF
as described in following Sections.
2.10.2.1 Equal Throttle Synchronization (Twin Screw) (default)
Equal Throttle synchronization simply commands the same throttle to both engines (i.e. push-pull
cables travel the same distance; electronic signals are the same). With Equal Throttle Synchronization
the Processors do not
receive tachometer signals representative of the engines RPM's.
NOTE: The Control System offers two types of synchronization, Active or Equal Throttle.
NOTE: The use of Value 03 for Function Code E7 should be avoided in the 9000 Series Processors with
mechanical throttle control.
Symptom
:
When selected, Value 03 (Active Synchronization, no Synch if Tach signal lost) for Function Code E7
(Synchronization) may give the operator the appearance that synchronization is not functioning. This is due to
the fact that the Control Head’s green Synch indication LED does not light until both engine RPM’s are within
the “Active Synch Deadband”. “Active Synch Deadband” is the maximum allowable difference in engine RPM,
where the Processors consider the system synchronized adequately. Once obtained, the control system does
not attempt to match
the RPM’s any closer.
When in this Mode of Operation, there is no indication to the operator that the Control Head levers are
matched close enough to start the synchronization process. Additionally, the green indication LED does not
blink while working toward synchronization.
Cause
:
Function Code E7, Value 03, is operating as designed. Due to the imprecise positioning of mechanical push-
pull cables, the ability to position the cables within the “Active Synch Deadband” is severely impaired.
Solution
:
All Processors with mechanical throttle control, where synchronization is desired, must set the Value of
Function Code E7 to Value 01 (Active Synchronization reverts to Equal Throttle Synchronization if Tach Signal is
lost)
CAUTION: The Control System will remain synchronized as long as the Control Head's levers are in close
proximity to one another. If a lever is moved to a point where the 10% throttle window is exceeded, a 10%
increase or decrease in engine RPM would occur with one engine, resulting in a sudden change in the vessel's
direction.
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