FNM® Series HPE – Installation Manual – 5
Maxim
um no
-load
speed
[rpm]
Use at maximum power only for short periods of time.
The damage caused by improper use or lack of
compliance with the range of use in terms of
crankshaft speed, will not be covered by the
guarantee by CMD.
2.6 Power-rating for commercial use
Some units of the range, while having the same set-up of the
above versions can be supplied with calibrations at reduced
power for commercial use.
The power reduction is needed when the engine is used in
harsh conditions or for long continuous periods.
There are four classes and one sub-class of power-rating:
- Class A - Leisure Boats: The use at full load is limited to
10% of the total period of use. The maximum power can
be used for 1 hour every 10 hours of use. Outside of
periods of use at maximum load, the speed must be
reduced by at least 10% compared to that of maximum
power. The cruising speed must be 90% less than the
maximum power speed. Limit of use: 300 hours per year.
- Subclass A1 - Light Commercial Applications for
Special Use: For light boats in commercial applications
for special use. The guarantee conditions may vary
depending on the application, check the warranty terms
with the company representative.
- Class B - Light Commercial Applications: The use at
full load is limited to 12.5% of the total period of use. The
maximum power can be used for 1 hour every 15 hours of
use. Outside of periods of use at maximum load, the
speed must be reduced by at least 10% compared to that
of maximum power. The cruising speed must be 90% less
than the maximum power speed. Limit of use: 800 hours
per year.
- Class C - Medium-Heavy Commercial Applications:
The use at full load is limited to 20% of the total period of
use. The maximum power can be used for 1 hour every 5
hours of use. Outside of periods of use at maximum load,
the speed must be reduced by at least 15% compared to
that of maximum power. The cruising speed must be 90%
less than the maximum power speed. Limit of use: 1200
hours per year.
- Class D - Heavy Commercial Applications: The use at
full load is limited to 60% of the total period of use. The
maximum power can be used for 1 hour every 2 hours of
use. Outside of periods of use at maximum load, the
speed must be reduced by at least 15% compared to that
of maximum power. The cruising speed must be 90% less
than the maximum power speed. Limit of use: 3000 hours
per year.
The limits of use are summarized in the following tables:
Use limit at
maximum
power
(*): Check the terms of use with the company representative.
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