69 | Operation
5. Press OK to confirm new offset and close the dialog.
See Figure 63: Follow Up Sensor Example on page 69 for example of Laser selected as follow up sensor.
Figure 63: Follow Up Sensor Example
2.5 Operational Scenarios
Guidelines to be followed when using the DP system in different situations.
2.5.1 Before Using Auto Position Nearby Other Objects
Apart from the manual actions required to make the system operational and set it in Auto Position Mode, there are also
guidelines to let the system learn environment forces present at the time.
Before setting the vessel into Auto Position Mode, first ensure a safe distance to other objects. Such a distance from
target should be at least 500 meters. When the vessel is holding position on this location the operator can give the
command to move 200 meters towards the target. Then the operator can check again and move another 200 meters
towards the target.
Closely monitor against overshoot when the vessel reaches a new stabilization point at 100 meters from the target.
At this point the operator should activate extra position reference systems, such as a Laser Sensor. If everything is
working properly the operator can give the command to move 75 meters towards the target and again check for position
overshoot.
Now the vessel is at 25 meter from the target location. The operator can give the command to move another 20 meters
towards the target. At this point the operator checks again that system will not overshoot more than feasible and is
holding position properly. The command can be given to move the last 5 meters and position the vessel on the target Set
Point.
2.5.2 Vessel Losing Position
When the vessel is in auto position nearby another object and loses position more than acceptable, the operator should
immediately engage system into manual control and sail away to a safe location.
Possible causes for position loss may be high wind, current conditions, failure of multiple position sensors, loss of
thrusters or loss of power. The system activates an alarm when the worst case failure occurs and the vessel cannot hold
position, caused by thruster or PMS failure (Diagnostics and Alarms on page 70).
2.5.3 Losing Redundancy (DP2)
When the vessel is in auto position with a DP2 requirement and it is suffering loss of a DP station, the redundancy will no
longer be available. The system will keep position, but the operator should move the vessel to a safe location where the
DP2 requirement is no longer required.
Other tasks such as cargo transfer should be stopped. The operator should notify other operators to end their sessions
so that the vessel can move away immediately thereafter.
2.5.4 Strong Current Force
When the vessel cannot hold position caused by a strong current force, rotating the vessel with the bow or the stern into
current may be a solution. This action should also be taken if the Worst Case alarm is activated to prepare the vessel for
possible thruster or PMS failures.
Содержание Alphatron Marine AlphaDynaPos
Страница 1: ...AlphaDynaPos Ship Automation and Navigation system Operation Manual www jrc am ...
Страница 5: ...5 Contents 4 2 Appendix B Checklist for Taking DP system into Operation 85 ...
Страница 13: ...13 Introduction III 3 System Overview DP2 Figure 2 system Overview DP2 ...
Страница 14: ...14 Introduction III 4 Sensor Overview Figure 3 Sensor Overview ...
