Rolls-Royce Helicon X3, User Manual

Page: 13 / 140

Safety
2
Page 5 of 6 Doc. No.: 13S000411
Revision: A Copyright © 2010 Rolls-Royce plc
normal control cpu, failure on the normal control order potentiometer in the lever on the
manoeuvre station currently in command and failure on the normal control field bus.
Alarm will be given in the control system and in the ship's alarm system.
3.1.3 Azimuth Control
The azimuth 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
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.
3.1.4 Dynpos and Joystick
If operating using an external Dynpos or Joystick system and a failure occurs either on
the pitch order, the rpm order or the azimuth order signal from the external system, the
external system is disengaged and the propeller responds to the control lever order on
the manoeuvre station in command. Alarm will be given in the control system and in the
ship's alarm system.
3.1.5 Autopilot
If operating using an external autopilot system and the azimuth lever order on the
manoeuvre station in command is changed more than the adjustable limit, normally 20
degrees, the autopilot is disengaged and the thruster will respond to the control lever.
This is indicated by blinking the Autopilot button, and the buzzer will sound until the
Autopilot button is pressed to acknowledge the mode change back to lever control.