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PAGE 16 — STOW G-4.5R A.C. GENERATOR— OPERATION & PARTS MANUAL — REV. #3 (03/13/06)
STOW G-4.5R — GENERAL INFORMATION
STOW G-4.5R Familarization
General Inspection Prior to Operation
This generator has been thoroughly inspected and accepted
prior to shipment from the factory. However, be sure to check
for damaged parts or components, or loose nuts and bolts,
which could have become disloged in transit.
The
STOW Model G-4.5R
generator has been designed as
a portable lightweight power source for 60 Hz (single-phase)
vibrators, lighting facilities, power tools, submersible pumps
and other industrial and construction machinery.
This generator is powered by a 9.0 HP ROBIN air-cooled
gasoline engine. The alternator, a brushless revolving-field
type, is permanently aligned to the engine through rigid
coupling.
The generator is mounted on rubber vibration isolators that
have a steel base backplate which is attached to the
protective steel pipe carrying frame. The protective carrying
frame is made of steel tubing and fully wraps around the
generator to protect against damage.
This portable generator is supplied with a electrical
control
panel
. The control panel includes items as listed below.
Control Panel
The generator control panel has the following componets:
■
NEMA 5-20R, GFCI duplex receptacle, (120V, 20 amps)
■
NEMA L5-20R, twist-lock receptacle (125V, 20 amps)
■
NEMA L5-30R, twist-lock receptacle (125V, 30 amps)
■
NEMA L6-20R, twist-lock receptacle (250V, 20 amps), (S/N
5498030 and below)
■
NEMA L14-20R, twist-lock receptacle (125/250V, 20 Amps),
S/N 5498031 and above.
■
Circuit breaker, 2-pole, 15 amps
■
AC Voltmeter
■
Operation Switch
■
Idle Control Switch
■
Full Power Switch
■
Oil Alarm Lamp (S/N 5498030 and below)
■
Ground Terminal (S/N 5498030 and below)
Excitation System
The STOW G-4.5R generator uses a magnet attached to a
flywheel to produce AC voltage from a lamp coil beneath
the flywheel. As the magnet passes the coil it produces
approximately 19-22 AC volts.
This voltage (19-22 VAC) is then sent to the control box that
contains three rectifying diodes:
z
Excitation (diode 1)
z
Battery (diode 2)
z
Slow Down (diode 3)
The AC voltage will pass through the excitation diode that
converts the voltage to DC power.
This DC power is then sent to the excitation windings housed
within the main windings commonly called the "stator".
This voltage is then transferred into the rotor through
induction. The rotor contains two diodes within it which rectify
the DC voltage and send it out through the main windings,
as AC voltage.
Engine
The four-cycle air-cooled
ROBIN
gasoline engine is designed
to meet every performance requirement of this generator.
Reference Table 1, for engine specifications.
Figures 3A through 3D shows the basic controls and
indicators for the G-4.5R generator.
NOTE
In keeping with
STOW's
policy of constantly
improving its products, the
specifications quoted herein
are subject to change without
prior notice.
Circuit Breaker
To protect the generator from an overload,
a 2-pole, 15 amp
circuit breaker is provided on the control panel. Make sure
to switch this circuit breaker to the "OFF" position prior to
starting the engine.