Generac Power Systems NP-50G Series User Manual

Generac NP-50G Recreational Vehicle Generator
Figure 5 — Switches for Engine
Safety Shutdown
■ HIGH TEMPERATURE SHUTDOWN
A high temperature switch (Figure 5) with normaily-open (N.O.)
contacts is mounted near the oil filter. If engine 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 boost” circuit (Figure
6). During engine cranking only, a positive DC (battery) volt¬
age is delivered through the diode, resistor, brushes and slip
rings, and 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 suf¬
ficiently strong magnetic field is available to produce “pick-up”
voltage in the stator windings.
Figure 6 — Field Boost Circuit
■ OVERVOLTAGE PROTECTION _
A solid state voltage regulator (Figure 7) controls the gener¬
ator’s AC output voltage. This regulator supplies an excitation
current to the rotor. By regulating the rotor’s excitation cur¬
rent, the strength of its magnetic field is regulated and, in turn,
the voltage delivered to connected electrical loads is con¬
trolled. When the AC frequency is 60 Hz, voltage is regulated
at 120 volts (voltage-to-frequency ratio is 2-to-1).
Figure 7 — Solid State Voltage Regulator
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The voltage regulator also incorporates a “voltage surge pro¬
tection circuit.” This circuit prevents troublesome surges in the
generator AC output voltage. Voltage surge is a common cause
of damage to electronic equipment.
■ 25-HOUR BREAK IN PERIOD
The first 25 hours of operation is the break-in period for the
generator. Properly breaking in the generator is essential to
minimize fuel consumption and provide maximum engine per¬
formance. During this 25-hour break in period, follow this
procedure:
• Run the unit at varying electrical loads, to help seat engine
piston rings properly.
• Check engine oil level frequently. Add oil if needed. It is
normal for the generator engine to consume more oil than
is normal until the piston rings have properly seated.
• For the 75-hour operation following the break in period,
avoid light electrical loads. Load the generator at 50% (or
more) of its rated wattage capacity. Repeated light loads
during these 75 hours can cause improper seating of engine
piston rings, resulting in blowby and high oil consumption.
• After operating the unit for 25 hours, complete the tasks rec¬
ommended under “25-Hour Check Up.”
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Recreational Vehicle Generator
11

Generac Power Systems NP-50G Series Specifications

General

Brand	Generac Power Systems
Model	NP-50G Series
Category	Portable Generator
Language	English