Generac 9600-3 Manuale Utente Scaricare il pdf (Pagina 11)

ADDITIONAL INFORMATION

This section discusses some of the engine protective

devices, overload protection and breaking in a new

generator.

AUTOMATIC LOW OIL PRESSURE

SHUTDOWN

The engine is equipped with a normally-open (N.O.) oil

pressure switch (Figure 4). Engine oil pressure holds

the switch open during cranking and operation. Should

oil pressure drop below about 2-6 PSI, the switch con

tacts close and the engine automatcially shuts down.

Figure 4 — Switches for Engine Safety Shutdown

HIGH TEMPERATURE SHUTDOWN

An oil temperature switch (Figure 4) with normally-open

(N.O.) contacts is mounted near the oil filter. If oil

temperature were to exceed about 284°F (140°C), the

switch contacts close and the engine shuts down.

FIELD BOOST

The Controller Circuit Board houses a field boost diode

and resistor which are not part of the automatic choke

circuit. These two components are part of a “field boosf

circuit (Figure 5). During engine cranking only, a posi

tive DC (battery) voltage is delivered through the diode,

resistor, brushes and slip rings, and to the generator

rotor. Application of this voltage to the rotor “flashes the

field” whenever it is started. Flashing of the field each

time the generator starts makes sure that a sufficiently

strong magnetic field is available to produce the re

quired “pick up” voltage in the stator windings.

OVER VOLTAGE PROTECTION

A solid state voltage regulator (Figure 6) controls the

generator’s AC output voltage. This regulator supplies

an excitation current to the rotor. By regulating the

rotor's excitation current, the strength of its magnetic

field is regulated and, in turn, the voltage delivered to

connected electrical loads is controlled. When the AC

frequency is 50 Hz, voltage is regulated at 120 volts

(voltage-to-frequency ratio is 2-to-1).

The voltage regulator also incoiporates a “voltage surge

protection circuit.” This circuit prevents troublesome

surges in the generator AC output voltage. Voltage

surge is a common cause of damage to electronic

equipment.

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Generac 9600-3 Manuale Utente Pagina 11

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