Sincro HB 2 Manual Para El Uso Y Mantenimiento página 20

ENGLISH
Ambient temp. (°C) 40 45
1 0,96
Altitude (m) 1000 1500 2000 2500 3000 -
1 0,96
Power factor 1 0,8
1 1
Important!
A drop in cooling air flow or inadequate
protection of the generator can lead to
damage and/or malfunction of the wind-
ings.
The generator is supplied without a con-
nection to earth; to make this connection
refer to relevant local regulations. An inef-
ficient earth connection or safety cut-out
WARNING!
can cause injury or death.
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 mechanical parts must be carried
out by a qualified specialist.
20 - HB - Maggio 2004 - Rev. 00
The generators in the HB range are designed to operate at a maximum
temperature of 40°C and at a maximum altitude above sea level of
1000m at s.l.
The nominal performance indicated on the plate refers to operation within
these temperature and altitude limits.
At temperatures over 40°C and/or altitudes above 1000m at s.l. a loss
of performance should be expected (see table on the left).
The Sincro Technical Office should be advised of any environmental
conditions that worsen the above limits.
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 of anticondensate heaters
to protect the windings from damp.
Before the initial start-up or after long shutdowns check the insulation
resistance towards earth of all windings (always remember to unhook the
voltage regulator before carrying out this test): the results must be over
2MOhm. If this is not the case, the alternator alone should be oven dried
at 60 ÷ 80°C for 3 hours. Before carrying out this operation remove the
voltage regulator. As an alternative to oven drying hot air at 60 ÷ 80°C
50 55 - -
can be blown through the alternator for at least 1 hour.
0,82 0,88 - -
In the event of installation inside a closed housing, make sure that the cooling
0,93 0,90 0,86 -
air temperature for the generator does not rise above standard.
The housing must be constructed so that the motor air vent in the housing is
0,7 0,6 0,5 -
0,93 0,88 0,84 -
separate from the generator air vent especially if the air inlet in the housing
has to be supplied by the cooling fan. Whatʼs more, the generator air vent
should be constructed to prevent damp from entering by fitting a suitable
filter. The housing should be designed so that there is a minimum clearance
of 50mm between the generator air vent and any flat surface.
If specified on order, the generator can be fitted with air filters.
Important! A drop in cooling air flow or inadequate protection of the
generator can lead to damage and/or malfunction of the windings.
The generator rotor assembly is factory balanced dynamically with full key.
The motor induces quite complex vibrations, including overtones that,
when added to the generator vibrations, can cause substantial vibration
levels damaging for the electricity 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 pre-
vent vibrations from exceeding the standard.
Dual bearing generators require a rigid frame to support the motor/
generator so that a good base is established for a precise alignment.
This frame should be anchored to the base with antivibration plugs. In
order to minimise 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 and not to exceed 2000N.
For greater shaft lengths the acceptable loads can be requested directly
from the Sincro Technical Office.
Alignment of single bearing generators is critical because it may give
rise to vibrations along the coupling between motor and generator. For
this purpose special attention must be given to the alternator to motor
assembly, providing a solid base and implementing anti-vibration plugs
to support the motor/alternator assembly.