ZF Marine ClearCommand 9000 Series Installation, Operation And Troubleshooting Manual page 236

able component of the system allows the propulsion engine to overspeed or the
pitch of the propeller to increase.
184.620 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.
(a) 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.
(b) 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 Mathers ClearCommand 9000 Series (electronic throttle, servo 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 Mathers provides audible tones at the Control Head locations to indicate system
faults.
ITEM FAILED
NUMBER COMPONENT
1 ZF MATHERS
CONTROL HEAD
2 LOSS OF POWER
SUPPLY
Design Verification Test Procedure
The ClearCommand 9000 Series (electronic throttle, servo clutch version) Propulsion Control
System is compliant to the environmental design standards in 46 CFR 62.25-30.
(1) One of the means may be the ability to readily disconnect the remote
engine control linkage to permit local operation.
(2) A multiple engine vessel with independent remote propulsion control
for each engine need not have a second means of controlling each
engine.
ALARM
STATUS
AUDIBLE TONE WILL
SOUND AT CONTROL
HEAD
ALARM CIRCUIT
WILL OPEN
INITIAL
RESULT
THROTTLE RESETS
TO IDLE
CLUTCH SHIFTS TO
NEUTRAL
THROTTLE RESETS
TO IDLE
CLUTCH REMAINS
AT LAST
COMMANDED
POSITION
Appendix B-8
FINAL
OUTCOME
NO INCREASE IN
ENGINE RPM
NO INCREASE IN
SHAFT SPEED
NO INCREASE IN
ENGINE RPM
NO INCREASE IN
SHAFT SPEED