176
EN 3340.758.003a - 2014-11
TROUBLESHOOTING
MM9000 Rev C.8 01/13
Page 176
MM9000 ClearCommand User Manual
Troubleshooting
10.11.1.3 Servo Throttle Equal Synchronization Troubleshooting
A
SYMPTOM:
The green LED is lit solid, though the Engine RPM’s differ by a significant
amount.
B
SYMPTOM:
One or both of the engines continually changes RPM (hunts). Will not
synchronize properly.
C
SYMPTOM:
Will not synchronize..
10.11.2 Active Synchronization
10.11.2.1 Basic Active Synchronization Troubleshooting
A
SYMPTOM:
The green LED is lit solid, though the Engine RPM’s differ by a significant
amount.
Cause
Remedy
a.
The throttle travel from Idle to Full is set
differently on the Port and Starboard
Processors.
a.
Scroll to Function Codes E2 and E3 on both Processors and
compare the Values.
The Values of E2 and E3 must be the same for both Processors.
b.
The engines run at different RPM’s with
equal travel of the Governors’/
Carburetors’ selector lever.
b.
While underway at cruising speed, decrease the Value of
Function Code E3 on the Processor running at the higher RPM
until both engine are at the same RPM.
This is not a normal condition and is masking the actual problem
with the engine. Top speed may be sacrificed by doing so.
Install Tach Senders and enable Active Synchronization with
Function Code E7.
c.
Excessive back-lash in the push-pull
cable(s) or linkage.
c.
Remove the excessive back-lash or install Tach Senders and
enable Active Synchronization with Function Code E7.
d.
Excessive bends in the push-pull cable(s).
d.
Reroute the push-pull cable(s) or install Tach Sender and enable
Active Synchronization with Function Code E7.
Cause
Remedy
a.
A Control Head’s Command Signal is
varying.
a.
Scroll to the Diagnostic Menu Function Code H0. Go to the
appropriate Station A/D Count’s display. The Value should not
change by more than +/- 1 A/D Count.
If so, check the connections and if good, replace the Control
Head.
b.
The push-pull cable’s travel from Idle to
Full is too short.
b.
Lengthen the Governor or Carburetor’s selector lever and attach
the push-pull cable to a point where the travel is in excess of 2.00
inches (50,8mm).
Cause
Remedy
a.
Excessive bends in the push-pull cable(s).
a.
Reroute the push-pull cable(s) or install Tach Sender and enable
Active Synchronization with Function Code E7.
Cause
Remedy
a.
The Tach Sender signal has been lost by
one or both Processors.
a.
Scroll to Function Code H0. Go to the Value for the Tach
Sender’s input frequency. If the frequency displayed is 0000, the
signal has been lost and the system diverted to Equal Throttle
Synch. Correct the wiring or replace the Sender.
Summary of Contents for MM9000
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