2.10.2.2 Active Synchronization (Twin Screw) (default Disabled)
Active Synchronization must be enabled during Set Up and a Tach Sensor Wire Harness must be used.
The Processors each receive a tachometer signal representing engine RPM from their respective
engines. These signals are compared with one another over a serial communication line. If the
Synchronization Criteria is met, the throttle command signal of the engine running at the higher RPM is
lowered, until the RPM's of both engines match.
2.10.3 Synchronization Indications
The green LED located on the Control Head indicates the status of synchronization.
• In Active Synchronization the green LED blinks every time there is a change in the
commanded throttle.
• When the green LED is lit steady, the engines are synchronized.
• When the green LED is not lit, the engines are not synchronized and the Control System is not
attempting to do so.
2.10.4 Turning Synchronization OFF:
A Ensure that the Control Head's levers are positioned to a point where Synchronization Criteria
are met.
B Press and hold the transfer button until the green LED blinks twice and then goes out
(approximately 2 seconds).
C Synchronization is now OFF.
2.10.5 Turning Synchronization ON:
A Ensure that the Control Head's levers are positioned to a point where Synchronization Criteria
are met.
B Press and hold the transfer button until the green LED lights (approximately 2 seconds).
• The green LED will blink as the system is working toward synchronization.
• The green LED will become solid when the engines are synchronized.
2.10.6 Turning Synchronization ON and OFF when Control Head Levers are not within a 10% (6
degree) Window of One Another:
The actual synchronizing of the engines occurs when the Control Head levers are within the 10%
(approximately 6 degrees) window of one another. However, synchronization can be turned ON or
OFF when the Control Head levers are apart more than the 10% (approximately 6 degrees) window of
one another.
• When synchronization is turned ON by pressing the transfer button, the green LED will light
after two seconds and stay lighted as long as the transfer button is depressed.
• When turning OFF synchronization by pressing the transfer button for two seconds, the green
LED will blink twice indicating that synchronization is turned OFF.
NOTE: In order for Equal Throttle Synchronization to work properly in Systems with mechanical Throttles, the
bends in the push-pull cables must be kept to a minimum. There can be no back-lash in the linkage or cables.
Both Governors or Carburetors must provide equal engine RPM with equal movement of their selector levers. If
these conditions can not be met, Active Synchronization is recommended.
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