Simrad AP50 Autopilot
118 20222410 / B
7.3 Failure Mode Effect Analyses
Should a technical fault occur, provisions have been made for
safe operation according to the following table:
Cause of failure Effect
Power failure in autopilot supply Acoustic POWER FAILURE ALARM
given (operated by separate alarm
supply)
Ship does not respond to rudder
command
“Vessel of course” alarm given when off
course limit exceeded during transit
Analog board:
Processor stop or software lockup
Analog command line open after approx.
1 sec. or signal frozen (depends on
setting of switch S6 on the JD53 Dual
Analog Board).
Watchdog restart after 1.6 seconds.
“No rudder response” alarm after 5 sec.
Analog board:
Data line or power line open in
internal bus cable
After 5 sec:
Analog command lines open, signal
level frozen.
Steering gear Mode1 and Mode2 go off.
“No rudder response” alarm
Analog board:
Missing reference voltage for
rudder control electronics.
“No rudder cntrl voltage” alarm.
Analog command lines open, signal
level frozen.
Solid state board:
Missing supply, blown fuse, broken
connection, defect drive
electronics.
“No rudder response” alarm.
To Next Page
Loading...
Need help?
General
