Generator Information And Theory; Gasoline, Ethanol, Propane; Yamaha Inverter And Conventional Generators - Yamaha EF4500iSE Theory & Diagnostics Manual

GENERATOR INFORMATION AND THEORY

Introduction
The purpose of this manual is to provide training
and information for Yamaha dealers who may not be
familiar with Yamaha Generators. It will help build a
better understanding of how Yamaha Generators
work, basic troubleshooting techniques, and tips for
dealership personnel.
The Importance of Warranty Registration
It is important to warranty register every applicable
Yamaha product sold by your dealership. It is essen-
tial for customer satisfaction and insures your cus-
tomer can receive warranty service from an
authorized Yamaha dealer should the need arise.
Furthermore, warranty repairs performed on a
unit not warranty registered, will not be consid-
ered for reimbursement . Warranty registrations
also assist Yamaha with contact information in the
event of a recall or safety related issue.

Gasoline, Ethanol, Propane

All models of Yamaha generators run on regular
gasoline. Up to 10% ethanol is acceptable for run-
ning conditions. However, ethanol tends to attract
moisture which will lead to poor performance, so it
should not be used when storing a generator for
more than a few days.
Currently, there are no propane conversion kits
available that Yamaha Motor Corporation, U.S.A.
supports. Further, Yamaha recommends against the
use of any aftermarket generator propane conver-
sion kits.

Yamaha Inverter and Conventional Generators

The AC power created by conventional generators is
known as "raw" power. The electricity produced by
the stator (coils) and rotor (magnets) is delivered to
the outlet without modification of the AC sine wave.
In addition, conventional generators must run at
3,600 rpm in order to maintain the required 60 Hz
cycle. The power generated by a conventional gen-
erator depends on a constant engine speed. Any
fluctuation of rpm will create peaks (spikes) and val-
leys in the AC sine wave. Conventional generators
rely on large, heavy stators and rotors, which means
a heavier generator. Conventional generators are
typically less fuel efficient at low output levels
because they must run at 3,600 rpm at all times.
Generator Information and Theory
Inverter generators differ from conventional genera-
tors in many ways. Inverter generators (Yamaha
models with Smart Throttle) do not rely on rpm to
control frequency (Hz). A highly specialized control
unit manages functions such as AC power modifica-
tion, rpm, circuit breaker protection, overload warn-
ing, and electrical output. Inverters do not need to
run at 3,600 rpm as most use a 3-phase multi-pole
stator. The inverter can produce more electricity with
fewer revolutions versus a single-phase conven-
tional generator. Typically, multi-pole coils work in
conjunction with numerous permanent magnets to
produce higher output at a lower rpm. Less revolu-
tions means higher fuel economy at lower outputs
and quieter operation.
Inverter generators also provide very stable and
clean power. The AC power produced by the multi-
pole coil is rectified into DC power – the control unit
then inverts the DC power back into AC power. This
final inversion creates clean, high-quality electricity.
In most cases, the electricity produced by a Yamaha
Inverter Generator is cleaner than most commercial/
residential power.
*
HIGH QUALITY
AC
*
PWM: Pulse Width Modulation is very clean and
stable output with a waveform distortion ratio of
2.5% or less. This low distortion ratio means the
output is cleaner than most commercial / residential
power, making it safe to run sensitive computer
equipment, televisions, and microchip-controlled
power tools.
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