General Mechanical And Electrical Specifications For Coupling With Engine - Sincro SK225 Serie Manuel D'utilisation Et De Maintenance

5. GENERAL MECHANICAL AND
ELECTRICAL SPECIFICATIONS FOR
COUPLING WITH ENGINE
As an independent unit, designed to be built into a generating
set, it is impossible to apply all the signal decals on the
generator during production. These decals, indicating
a potential hazard or risk due to live components are
supplied loose and have to be applied by the constructor
of the generating set.
These generators are designed to operate at a temperature
between -20°C and 40°C and at a maximum altitude of
1000m a.s.l.
The nominal performance indicated on the plate refers
to operation within these temperature and altitude limits.
Contact Sincro Technical Office for operate outside
these parameters.
At temperatures over 40°C and/or altitudes above 1000m
a.s.l. a derating should be applied (see table).
Ambient temp. (°C)
40
1
Altitude (m)
1000
1
Power factor 1
1
For all "UL" generators, don't consider these data and
contact the Sincro Technical Office.
The generators are fitted with an air ventilation system,
protective guards and drip-proof covers; they are not
suitable for outdoor installation unless an adequate
protective shelter is provided. When under storage,
awaiting installation or in standby, it is advisable to use
anticondensation heaters to protect the windings from
damp.
In the event of installation inside a closed housing, make
sure that the cooling air temperature for the generator
does not rise above standard.
The canopy must be constructed so that the engine air
vent in the canopy is separate from the generator air vent,
especially if the air inlet in the canopy has to be supplied by
the cooling fan. What's more, the generator air vent should
be constructed to prevent humidity from entering by fitting
suitable protections. The canopy should be designed so
that there is a minimum clearance of 50mm between the
generator air vent and any flat surface.
20
45 50 55 -
0,96 0,92 0,88 -
1500 2000 2500 3000
0,96 0,93 0,90 0,86
0,8 0,7 0,6 0,5
1 0,93 0,88 0,84
A drop in cooling air flow or inadequate
protection of the generator can lead to
damage and/or malfunction of the windings.
WARNING!
The space around the air exit protection grid must be free.
The generator's rotor is dynamically balanced in factory.
The engine induces quite complex vibrations, including
harmonics with different frequency that, when added to the
generator vibrations, can cause substantial vibration levels
dangerous for the generating set operation. Therefore it
is essential that the plant engineer takes all necessary
measures to ensure alignment and provide a firm base and
supports in order to prevent vibrations from exceeding the
standard.
The alternator is designed to work with vibration's values
as reported in ISO 8528-9.
Alignment of single bearing generators is critical because
-
it may give rise to vibrations along the coupling between
engine and generator. For this purpose special attention
-
must be given to the alternator to engine assembly,
providing a solid base and implementing anti-vibration
-
dampers to support the engine/alternator assembly.
-
Dual bearing generators require a rigid frame to support
-
the engine/generator so that a good base is established
for a precise alignment. This frame should be anchored to
-
the base with anti-vibration dampers. In order to minimize
twist oscillations, it is advisable to use a suitably sized
flexible joint.
In belt transmissions applied to dual bearing generators
it is essential that the pulley diameters and constructions
permit the load applied to the shaft to be centred with the
length of the nub. The acceptable loads can be requested
directly to the Sincro Technical Office.
The terminal box contains the insulated terminals for
connecting the phases and neutral and for the earth
connection.
The generator is supplied without a
connection to earth; to make this connection
refer to relevant local regulations. An
inefficient earth connection or safety cut-out
WARNING!
can cause injury or death.
The neutral is NOT connected to the housing.
The generator fault currents are available on request to help
the plant engineer in sizing the plant and its components.
An error in installation, use, maintenance
or replacement of parts can cause severe
injury or death, not to mention damage to
the machinery. All work on electrical and/or
WARNING!
mechanical parts must be carried out by a
qualified specialist.