Power Monitoring And Blackout Prevention; Power Monitoring - NAVIS NavDP 4000 Series Operation Manual

Thrusters
– When weather is bad or environment changes direction slowly.
– When fast DP maneuvers are required.
– When accurate station keeping is the highest priority for intermediate environment.
Prohibited Azimuth Sector — prohibit thrust direction for particular azimuth thruster to avoid thruster-to-thruster and
hull-to-thruster interaction, see Figure 6.31.
See Section 6.1.2, page 102 for Thrust Ability diagram.

6.4 Power Monitoring and Blackout Prevention

The PMS Function acts in addition to the vessel's Power Management system. The function is active in all operational
modes.
The PMS function can be turned on/off from PARAM window, PWR LIM tab (see Figure 6.32).
In case PMS monitor function is turned off by the operator, the red-colored text "PMS Function Off" is displayed on
the Master CPU panel (see Figure 6.33).
NOTE! NAVIS NavDP 4000 cannot control the generator load and power shar-
ing. The only way to influence the generator load is the thruster load
control.
Therefore, NAVIS NavDP 4000 assigns the thrust demand to each thruster so that:
– to provide good performance in a particular operational mode;
– to avoid generator's overload and provide blackout prevention.

6.4.1 Power Monitoring

The goals mentioned above may conflict, therefore NAVIS NavDP 4000 tries to achieve a trade-off between them.
The following data is considered:
– current power output of each generator;
– current power input of external consumers;
Doc. 000.JDP-10000-OME, rev.3.3.13/"2102.$–17A-Advanced"
Figure 6.31: Prohibited Azimuth Sector
Figure 6.32: PMS Function Turning On/Off
Figure 6.33: PMS Function Off on the Master CPU Panel
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