149
EN 3340.758.003a - 2014-11
TROUBLESHOOTING
MM9000 Rev C.8 01/13
Page 149
MM9000 ClearCommand User Manual
Troubleshooting
10.5.1.2 One Long - Three Short Tones
This tone indicates that there is an invalid command signal at the Station-in-Command.
The Processor expects a DC voltage, representative of the Control Head’s present lever position. This
voltage is referred to as the “
Command Signal
”. In normally functioning Control Heads, the command
signal is between approximately 0.8VDC at Full Astern to 4.10 VDC at Full Ahead.
The command signal is converted by the Processor to a digital representation, referred to as an A/D
Count. More on A/D Counts later. If the command signal drops below 0.6VDC or exceeds 4.40 VDC,
the tone will be generated.
At the same time the tone is heard, throttle command drops to Idle and the clutch will be commanded
to Neutral. The following items will cause this to occur:
•
An open or high resistance connection between the Control Head and Processor.
•
Out of calibration Control Head.
•
A defective Control Head.
•
A defective A/D Converter in the Processor.
The exact cause of the malfunction can be found as follows:
A
Check the Processor’s Display for error messages. Most likely, one of error messages
13
thru
32
will be shown. The exact number shown depends on which remote station is
experiencing the problem and whether the command signal was too high or too low.
B
Enter the Diagnostic Menu as outlined in Section 10.4: Troubleshooting Diagnostic Menu.
C
Depress the Up or Down (Scroll) Push Button until the appropriate Remote Station is
displayed.
•
The Remote Station are identified by the position of the decimal points.
•
Station 1 has no decimal point after the first digit to the far right. The
remaining three digits all have decimal points.
•
If the digit to the far left had no decimal point following it, but the remaining
three do, this would represent Station 4.
D
The examples in Figure 10-14: Display Examples of Remote Stations are shown with no
Control Heads connected to any Remote Stations. When a Control Head is connected, the
Figure 10-14: Display Examples of Remote Stations
S
TATION
1
S
TATION
4
S
TATION
2
S
TATION
5
S
TATION
3
Summary of Contents for MM9000
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