NAVIS NavDP 4000. Operation Manual
– maximal power limits (in %, represented as scales) for each generator (this parameter is set in the Pow Lim param-
eter page);
– maximal power limits (in %, represented as scales) for each thruster (this parameter is set in the Thr Lim parameter
page);
– position of each circuit breaker and the tie breaker;
– current value of power input from each thruster.
Based on this information, the PMF continuously monitors the power system and produces recommendation to the
Controller and the Thrust Allocation function, so that the upper limits for the generators and thrusters would not be
exceeded. The generator upper power limits set in the Pow Lim parameter page are normally smaller compared to the
limits of the vessel’s Power Monitoring system (PMS), so that the vessel’s PMS interferes when the
NAVIS NavDP 4000
cannot keep the generator’s load within predetermined limits.
6.4.2
Generator/Engine Overload Protection and Blackout Prevention
Automatic reducing thrusters’ pitch/rpm is used for generators/bus bars overload protection.
Automatic reducing of propellers’ pitch/RPM is used for main engine overload protection.
Generator Overload Protection and Engine Overload Protection functions can be turned on/off from
PARAM
window,
PWR LIM
tab (see Figure 6.34).
Figure 6.34: Overload Protection Settings
In case generator/engine overload protection is turned off, in the Power window main engine (ME) and/or bus name
and the numerical value of the corresponding fields AVAIL are highlighted in yellow (see figure 6.35).
Figure 6.35: Diesel Protection off and Blackout Prevention off
At some problems in power signals of Generator, its Overload Protection Function will be automatically turned off.
6.4.3
Power Alarms
Generates an alarm when power limits are exceeded.
NAVIS NavDP 4000
interfaces each generator by means of the signals listed below.
Generator Breaker Status
— discrete feedback signal;
Generator Power
– analog (voltage or current) feedback signal for PMS function.
Besides that, for all tie breakers the
Tie Breakers Status
signal is used.
For each Main Engine, the
Main engine Power
feedback signal is used.
6.4.4
Power View
The Power View provides you with all the information about the thruster and generator load, the positions of the
circuit breakers and tie-breakers. It is displayed in Power window. Use the Select window softkey on SYS panel to open
the Power window.
An example of power window is shown in Figure 6.36.
The Power View window is divided into 3 areas:
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