General Mechanical And Electrical Specifications For Coupling With Engine - Sincro SK225 Serie Manual De Uso

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.
22
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.