OPX300K2 05/12
6
Mechanical Construction
STATOR
The stator frame is fabricated from rolled steel. The
round construction provides rigidity and strength to
resist excessive mechanical shocks. The stator core is
made of high quality silicon steel plates coated with
insulating fi lm for prevention of eddy currents. The
core is positioned along the internal surface of the
frame. The exciter fi eld core is made of special steel
plates capable of retaining a high degree of residual
magnetism.
BEARINGS
The long-life ball bearings are sealed to prevent grease
from escaping and to keep dirt out.
ROTOR
The rotor shaft is made of high quality carbon steel,
and is designed and manufactured to be mechanically
durable. The rotor is a salient revolving fi eld type
with the main fi eld core made from special steel plates
having superior magnetic characteristics. The fi eld
core elements, exciter rotor, rotary rectifi er and
cooling fan are integral parts of the same shaft.
VENTILATION
Cooling is provided by the cooling fan of the rotor
through suction ports and exhausted through outlet
ports. Every machine conforms to the cooling code
ICO1 of BS.
Initial Inspection and Coupling
INITIAL INSPECTION
If the generator is stored for long periods of time, store
in a clean, dry, ventilated area. After extensive stor-
age time, check the resistance of the coil insulation in
accordance with this manual (see
MAINTENANCE
,
page 11) before operation. Be sure there are no abnor-
mal sounds or any overheating during operation. It is
recommended that standby generators utilize a space
heater (op tional) in order to keep the coil insulation in
optimum working condition.
COUPLING WITH PRIME MOVER
PX-300K series single bearing generators make
centering and direct coupling easy. Coupling bolt size
and torque will vary according to the engine
manufacturer.
GROUNDING
The generator frame should be electrically grounded
to the base of the generator set. The neutral is not
grounded to the frame unless specifi ed.
