14.5 Guideline for electrical and automation system
Load increase during ship acceleration, manoeuvring, and load transfer between generators
must be controlled according to instructions in chapter 2.2 Loading Capacity. The total load
increase rate on a recently connected generator (preheated engine) is the sum of the uploading
that is performed by the load sharing control and by the propulsion control.
Fastest possible loading up to high load should only be available by activating an “emergency
loading” function, which is indicated by an alarm in the control room and on the bridge. In
applications with highly cyclic load, e.g. dynamic positioning, maximum loading can be used
in operating modes that require fast response. Other operating modes should have slower
loading rates. Maximum possible loading and unloading is also required for e.g. tugs.
Load reductions from high load must be rate limited in normal operation as described in chapter
2.2 Loading Capacity. Crash stop can be recognised by for example a large lever movement
from ahead to astern. In the low load range, which is typically used during manoeuvring, the
load can be reduced without rate limitation.
The response to increase and decrease pulses from PMS or synchroniser is 0.1 Hz per second
by default, but the rate is adjustable. This is the rate for the speed setting. Actual speed and/or
load change at a much slower rate, especially when the adjustments are small. Recommended
deadband for load balancing (PMS control) is ±2% of rated power.
The engine can absorb 5% reverse power. Recommended setting for the reverse power
protection is 5% of rated power with 10 s delay.
DAAB605814 14-7
14. Automation SystemWärtsilä 46F Product Guide
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