62-11637
2–6
2.3.4
Alternator
Electrical power for the control system and for charging
the battery is provided by the 12 VDC alternator.
a. Alternator Operation
CAUTION
!
Observe proper polarity when installing
battery. Negative battery terminal must
be grounded. Reverse polarity will
destroy the rectifier diodes in alternator.
As a precautionary measure, disconnect
the negative and then the positive battery
terminal when charging battery in unit.
The alternator converts mechanical and magnetic
energy to alternating current (AC) and voltage, by the
rotation of an electromagnetic field (rotor) inside a
three-phase stator assembly. The alternating current
and voltage is changed to direct current and voltage by
passing AC energy through a three-phase, full-wave
rectifier system. Six silicon rectifier diodes are used.
The regulator is an electronic switching device. It
senses the system voltage level and switches the volt-
age applied to the field in order to maintain proper sys-
tem voltage.
b. Voltage Regulator Operation
The Integral regulator is an all-electronic, transistorized
device. No mechanical contacts or relays are used to
perform the voltage regulation of the alternator system.
The electronic circuitry should never require adjust-
ment and the solid state active elements used have
proved reliable enough to warrant a sealed unit. The
system is temperature compensated to permit the ideal
charging rate at all temperatures.
2.3.5
Power Train
that transfers power from the engine to the condenser
and evaporator fans. The system consists an upper
and lower belt, gear box, fan shaft and clutch.
2.3.6
Compressor
The compressor assembly includes the refrigerant
compressor, suction and discharge service valves, high
pressure switch, compressor discharge temperature
sensor and the suction and discharge pressure trans-
ducers. The compressor draws refrigerant gas from the
evaporator and delivers it to the condenser at an
increased temperature and pressure. The pressure is
such that refrigerant heat can be absorbed by the sur-
rounding air at ambient temperatures.
Figure 2.4 Power Train
2.3.7
Unloaders
The compressor is equipped with unloaders as standard
equipment. Unloaders are used as a compressor capac-
ity control to unload the cylinder banks during periods of
reduced cooling loads. This provides closer temperature
control and reduces the power required to operate the
compressor; thus reducing fuel consumption.
a. Major Working Parts
• Solenoid and valve system.
• Spring loaded piston type bypass valve.
• Spring loaded discharge check valve (located on
the valve plate).
Condenser Fan
Clutch
Fanshaft
Assembly
Evaporator Blower
Upper Belt
Upper Idler
Gear Box
Lower Belt
Lower Idler
Unidrive
Содержание Transicold X4 7300
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