Rolls-Royce Helicon X3, User Manual

Page: 12 / 140

Safety
Page 4 of 6 Doc. No.: 13S000411
Revision: A
Copyright © 2010 Rolls-Royce plc
3 Safety Instructions
This Rolls-Royce system is a remote control system that is controlling propulsion units
on the vessel. By operating the system, the thrusts direction and pitch/speed
performance can be controlled.
The operator must at all times be aware of:
• Consequences of operating the system to prevent injury to people, damage of
equipment, damage to the vessel operated and damage to the surroundings.
3.1 Safety Functions
A number of safety functions are included in the system. These functions will become
operative if a failure should occur in the propeller control system itself, or in external
systems connected to the propeller control system.
Note: The backup control system has only interface to the control levers. The
backup control system does not have interface to external control
systems like Dynpos, Joystick or Autopilot
Note: No azimuth restrictions or load control functions are included in the
backup system. When operating using the backup system, the operator
must be careful not to overload the engine or the propeller system. If a
load control system is included in the Rpm Drive, this will still be in
operation.
Note: The safety functions described underneath will only be available if the
thruster(s)/gear(s) have got the described function in the first place.
3.1.1 Pitch Control
The pitch control is one of the redundant functions in the control system. The backup
control system will automatically be engaged if a serious failure occurs in the normal
control system. This includes loss of power supply to the normal control system, halt in
the normal control cpu, failure on the normal control order potentiometer in the lever on
the manoeuvre station currently in command, failure on the normal control field bus and
failure on the normal control feedback potentiometer. Alarm will be given in the control
system and in the ship's alarm system.
3.1.2 RPM Control Electric Engine
The RPM control is a redundant function in the control system. The backup control
system will automatically be engaged if a serious failure occurs in the normal control
system. This includes loss of power supply to the normal control system, halt in the