Condensing Section Refrigeration System; Figure 2.9 70 Amp Alternator - Carrier Supra 950MT Operation & Service Manual

12VDC Terminal (D+, Output)
Ground Terminal (B-)
Alternator/Regulator
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 positive battery terminal when
charging battery in unit. Connecting charger in reverse will destroy the rectifier diodes in alternator.
The alternator supplies power for operation of the system controls and charging the unit battery, if equipped.
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 (DC) and voltage by passing AC energy through a three-phase, full-wave rectifier system. Six silicon
rectifier diodes are used.
The regulator is an all-electronic, transistorized device. No mechanical contacts or relays are used to perform the
voltage regulation of the alternator system.
The regulator is an electronic switching device. It senses the voltage appearing at the auxiliary terminal of the alter-
nator and supplies the necessary field current for maintaining the system voltage at the output terminal. The output
current is determined by the load.
2.4.2

Condensing Section Refrigeration System

The condensing section mounted refrigeration system equipment includes the compressor, condenser/subcooler,
accumulator, filter drier, receiver, compressor pressure regulating valve, main heat valve (MHV), and the receiver
pressure valve (RPV).
a. Compressor
The compressor assembly includes the refrigerant compressor, suction and discharge service valves, high pres-
sure switch, unloader, and the suction pressure transducer. The compressor draws refrigerant gas from the evapo-
rator and delivers it to the condenser at an increased pressure. The pressure is such that refrigerant heat can be
absorbed by the surrounding air at ordinary temperatures.
62-11863

Figure 2.9 70 Amp Alternator

2-12
R e g u l a t o r, B r u s h H o l d e r,
Brushes (Internal)
Positive Output Terminal (B+)