18
OPM-171/B
OPERATING CONDITIONS
NORMAL OPERATION
This generator set is designed to be operated under load
and the accumulation of operating hours without load can
cause unburned fuel from the combustion chamber to build
up in the exhaust system. This is called wet stacking and can
result in fouled injectors and carbon buildup in the exhaust
pipes, turbo and exhaust valves.
The Diesel Oxidation Catalyst (DOC) on the engine has to
reach target temperatures during operation for the fuel
to burn completely. The generator set should be given a
minimum average load of at least 25% to achieve these
conditions and avoid damage from wet stacking.
If the engine is cold at start up run it for 2-5 minutes and
then load the generator. Idling longer than this is more
likely to damage the engine than extend its life
If the generator application is for emergency standby the
generator should be exercised at least monthly ideally
under load. Load banking the generator at least annually
will help keep the engine in good condition.
HARSH ENVIRONMENTS
OPERATIONS
Some applications require the generator to operate in
harsh environments. One of the most common hazards are
extremely dusty conditions. In harsh conditions it is often
necessary to take additional steps to keep the equipment
clean and operating at its peak. Maintenance intervals on
lubricant and filter changes may need to be shortened. An
oil quality testing program can also provide early warnings
or oil degradation. Efforts may need to be made to reduce
the amount of dust and debris entering the housing and
generator components.
COLD WEATHER OPERATIONS
The minimum natural starting temperature with glow plugs
is -5°F. The minimum starting temperature with glow plugs
and block heater is -13°F.
The degree of fluidity of the diesel oil can may be reduced
at low temperatures due to the separation of the paraffin.
This results in the filters becoming clogged.
The ASTM D975 or EN590 specifications distinguish
different classes of diesel fuel, identifying the characteristics
of those that are best adapted to low temperatures.
Oil companies must respect these standards, which provide
for the distribution of fuels adapted to the climatic and
geographical conditions in various countries.
This generator-engine set needs load and should not idle
for long periods of time.
If the generator set will be run in extremely cold
environments it may be beneficial to provide means to
reduce air circulation to increase the temperature of the
enclosure.
Inspect the CV filters and hoses regularly during cold
operation looking for signs of freezing. If the line freezes it
will cause pressure to build in the crankcase and may cause
an engine seal failure. An optional CV hose heater kit is
available to install and is recommended for units operating
in temperatures below 14°F. If the engine operates below
optimal temperatures for long periods of time damage may
occur.
It is possible for water to collect and freeze in the lines and
manifolds of the air system preventing the compressor
from operating. Starting the generator with the compressor
unloaded until the enclosure is warmed will prevent this
issue.
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