Kohler 300EFOZCS, Операция

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TP-7126 5/20 47 Section 2 Operation
2.5 Load Profile
Whenever operating the generator set, Kohler Co.
recommends maintaining the minimum load profile
indicated in Figure 2-2. Maintaining the load profile
prevents corrosion formation on internal engine
components when they’re exposed to the breakdown of
exhaust gases. Extended light loading may result in
engine “wet stacking.”
Minimum Engine HP
Load Requirement
Maximum Ideal Engine HP
Load Requirement
30% load 70% load
Figure 2-2 Load Profile
Unburned Fuel (Wet Stacking) occurs when
water/fuel vapor condenses in the exhaust system. At
normal
combustion temperatures, water stays
vaporized but at low combustion temperatures, it
condenses back to a liquid. When running the generator
set under normal loads (30% load or more) for long
periods of time, diesel exhaust stays hot enough to
prevent water/fuel vapor from condensing. Conversely,
if the generator set is subjected to light loads (30% or
less) for long periods of time, water/fuel vapors
accumulate and may result in the following conditions to
develop:
D
Cylinder wall glazing
D
Fuel on water
D
Crankcase oil dilution
D
Wet stacking
Note: Consult the engine manufacturer’s guidelines for
more details on unburned fuel and wet stacking.
The operator should perform all of the prestart checks.
Start the generator set according to the starting
procedure in the controller section of this manual. While
the generator set is operating, listen for a smooth-
running engine and visually inspect the generator set for
fluid or exhaust leaks.
2.6 Controller Operation
Note: Opening seacock. Before starting the generator
set, open the seacock to allow cooling water
passage. Failure to do so could damage the
seawater pump impeller and cause serious
engine overheating damage.
Note: Transfer switch. Check that the marine
ship-to-shore transfer switch, if equipped, is in
the ship position.
Note: If the generator set does not start after 3 crank
attempts (an overcrank fault occurs):
1) Close the seacock.
2) Completely drain the water from the
exhaust system at the silencer’s drain plug.
3) Do not attempt generator set restart.
4) Contact an authorized Kohler
r
distributor/dealer.
A water-filled exhaust piping and silencer may
further hinder generator starting and cause
seawater entry into the engine cylinders through
the exhaust valves. Water ingested into the
engine may cause major engine damage that the
Kohler Co. warranty does not cover.
The controller operation includes several types of
starting and stopping functions as detailed below. The
controller buttons, lamps, and alarm horn functions are
summarized in Figure 2-3.