Propulsion engine control systems.
A A vessel must have two independent means of controlling each propulsion engine. Control
must be provided for the engine speed, direction of shaft rotation, and engine shutdown.
• One of the means may be the ability to readily disconnect the remote engine control linkage
to permit local operation.
• A multiple engine vessel with independent remote propulsion control for each engine need
not have a second means of controlling each engine.
B In addition to the requirements of paragraph (a), a vessel must have a reliable means for
shutting down a propulsion engine, at the main pilothouse control station, which is
independent of the engine's speed control.
C A propulsion engine control system, including pilothouse control, must be designed so that a
loss of power to the control system does not result in an increase in shaft speed or propeller
pitch.
The ZF Marine Propulsion Systems Miramar ClearCommand 9000 Series (servo throttle, solenoid clutch
version) marine engine controls offer single lever control of speed and direction. Each enclosure houses an
independent Control Processor and requires separate power supplies. The system operates on 12 or
24VDC power and can have up to five remote stations depending on the application. The system
sequences the operation of speed and shift in order to prevent an inexperienced operator from mishandling
the engine or transmission.
A standard feature is an alarm contact (normally open) to interface with the main alarm system of the
vessel. This switch will open and activate the alarm system with a power loss or CPU failure. In addition, ZF
Marine Propulsion Systems Miramar provides audible tones at the Control Head locations to indicate
system faults.
DESIGN VERIFICATION TEST PROCEDURE
The ClearCommand 9000 Series (servo throttle, solenoid clutch version) Propulsion Control System is
compliant to the environmental design standards in 46 CFR 62.25-30.
The following test procedure covers the 2 items included in the Qualitative Failure Analysis; 1) Control
Head Potentiometer failure, and 2) Loss of power supply.
A Failure: Control Head Potentiometer failure.
• Results: The Processor will shift to Neutral (if needed) and throttle will go to Idle, (if needed).
• Test Procedure:
• Turn power on to both Port and Starboard Processors. Take command at a Control Head.
• Move the Port and Starboard Control Head levers to approximately ½ Ahead.
• Locate the green wire coming from the Port Control Head in command, connecting to pin 6
of the respective terminal block on the ClearCommand 9000 Series circuit board.
Disconnect it from the ClearCommand 9000 Series circuit board.
• The Port Processor will shift to Neutral and throttle will go to Idle.
• The Port Control Head will give an alarm tone indicating a faulty potentiometer.
• Move the Port and Starboard Control Head levers back to Neutral. Reconnect the green
wire.
• Repeat for Starboard side.
B Failure: Power failure to ClearCommand 9000 Series
(A power failure to the ClearCommand 9000 Series circuit board will have the same results as a failed
microprocessor)
Item No. Failed Component Alarm Status Initial Result final Outcome
1.
ZF Marine Propulsion
Systems Miramar Control
Head
Audible tone will sound at
Control Head
Throttle resets to Idle. No increase in Engine RPM
Clutch Shifts to Neutral. No increase in shaft speed.
2. Loss of Power Supply Alarm Circuit will OPEN.
Throttle remains at last
commanded position.
Clutch Shifts to Neutral No increase in shaft speed.
To Next Page
Loading...
Need help?
General
