Furuno FEA-2107 Operator's Manual page 486

29. Steering With Yokogawa PT-500A
Alarm "2469 Autopilot: off course", which appears, if the autopilot needs more than a set limit (the limit is
available in Installation parameters for Track mode). This alarm is repeated every 5 minutes, if the condition
continues.
Alarm "2471 AP mode Conflict - Use AUTO", which tells that ECDIS and Yokogawa autopilot cannot perform
Track steering mode. First change mode from "NAVI" to "AUTO" and then check that preconditions for route
steering are fulfilled.
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.
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.
Alarm "2488 Integrated Steering lost", which appears, if the connection to the autopilot is lost during automatic
Route Steering and the used integrated steering mode cannot be continued. NOTE: Normally you get first alarm
"2480 Autopilot Receive error"
Alarm "2497 Route: Stop - Sensor Fail", if no gyro data is received or if conditions of alarm 2475 or 2476 has
been valid for last minute.
Alarm "2506 Route:Use AUTO control" is instruction for user to change steering mode to AUTO. This alarm is
generated if there are not sufficient conditions to continue Track mode (i.e. alarm 2475 or 2476 has been valid 10-15
seconds).
Alarm "2511 Route:Auto resume disable", if alarm 2471 has been generated and later condition for alarm 2471
disappears without changing steering mode from "NAVI" to "AUTO" or "HAND". First change steering mode to
"AUTO" or "HAND" and then check that preconditions for route steering are fulfilled.
Alarm "2512 Use NFU rudder control", if rudder servo unit cannot be controlled by Yokogawa steering control
unit, this alarm is generated to request a change to Non Follow Up control of rudder(s). First change using System
Selector Switch from "FU" to "NFU" and then use Non-Follow Up steering lever to control rudder(s).
Alarm "2514 Route:Complete turn", this alarm is generated if there are not sufficient conditions to continue Track
mode during turn (i.e. alarm 2475 or 2476 has been valid 10-15 seconds). Vessel will complete the turn with
planned conditions.
Alarm "2515 Conflict - NAVI Compl. turn" which tells that ECDIS and Yokogawa autopilot cannot perform
Track steering mode after turn. Autopilot uses planned radius to complete the turn. After turn is completed, first
change mode from "NAVI" to "AUTO" and then check that preconditions for route steering are fulfilled to start
Track steering mode again.
Alarm "2516 Autopilot: Drift limit", which appears, if the autopilot needs more than a set limit to compensate
drift(the limit is available in Installation parameters for Track mode (max drift compensation)). This alarm is
repeated every 5 minutes, if the condition continues.
29.4.7 Collision avoidance maneuver during automatic route
steering
Often the route steering is interrupted by a collision avoidance maneuver, but there are also several other reasons to
interrupt the route steering.
There are several possibilities to set the collision avoidance or any other maneuver:
• Use Non Follow Up steering lever to control directly rudder pumps
• Use Follow Up rudder control (Change mode from "NAVI" to "HAND").
• Use local Autopilot Heading control (Change mode from "NAVI" to "AUTO").
Now the route steering is disabled until mode "NAVI" in Yokogawa Autopilot panel is selected again. Note that for
going back to route steering the ship heading must point to the next waypoint and vessel must be located inside the
channel limits, otherwise an alarm is given.
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