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Typical intermittent alarms not described in other chapters are:
Alarm "2010 Filter: Pos source change", which appears if differential GPS used in filter positioning has changed
its operation mode either from differential mode to normal mode or normal mode to differential mode. If used
steering mode is "Goto Track" also alarm "2492 Route: Needs diff Pos" appears, if DGPS has changed it's mode to
normal mode.
alarm "2457 Route: Outside chl limits", which appears when the own ship is goes outside the planned channel.
Alarm "2455 Route: off course", which appears, if the system needs more than a set limit (the limit is available in
Installation parameters) to keep the track. This alarm is repeated every 5 minutes, if the condition continues.
Alarm "2456 Route: WP approach error", which appears, if because of for example decreasing speed the own ship
is more than waypoint approach alarm time + 100 seconds away from the wheel over point after the user have
already acknowledged alarm "2451 Route: WP approach alarm" to enable the next automatic turn. After the alarm
2456 the next turn is not enabled and the system will generate a new alarm "2451 Route: Wp approach alarm" when
appropriate.
Alarm "2460 Pilot: ROT will be exceed", which appears, if the set radius value in the Trackpilot panel together
with the current speed of the ship request rate of turn which is over the limit set in Route Parameter Max. rate of
turn.
Alarm "2461 Route: ROT will be exceed", which appears, if the planned radius for next waypoint together with the
current speed of the ship request rate of turn which is over the limit set in Route Parameter Max. rate of turn. This
alarm is activated if the own ship is within value WP approach alarm time set in Route Parameters from the wheel
over point,
alarm "2469 Trackpilot: off course", which appears, if the trackpilot needs more than a set limit (the limit is
available in Installation parameters for Go To Waypoint mode. Go To Track mode uses fixed value of 30 degrees)
to keep the track. This alarm is repeated every 5 minutes, if the condition continues.
Alarm "2475 Route: Needs filter on", which appears, if the position from the Kalman filter is not available. This
alarm is repeated every 15 seconds, if the condition continues. NOTE: If you used Goto Track mode, then the
system changes automatically to Goto Waypoint mode and generates alarm "2489 Route: Changed to Goto WP".
Alarm "2476 Route: Needs log sensor", which appears, if the position from the Kalman filter cannot be compared
against an independently operating log. This alarm is repeated every 15 seconds, if the condition continues.
NOTE: If you used Goto Track mode, then the system changes automatically to Goto Waypoint mode and generates
alarm "2489 Route: Changed to Goto WP".
Alarm "2492 Route: Needs diff Pos", which appears if the Filter did not have high precision position sensor for
track steering. Selected sensors must include at least one high precision sensors. If you used Goto Track mode, then
the system changes automatically to Goto Waypoint mode and generates alarm "2489 Route: Changed to Goto
WP".
374 • • • • Steering with EMRI Trackpilot
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