Multiquip Portable AC Generator GA4.5R - Manual (Page 13)

GA-4.5R/GA-4.5RA A.C. GENERATOR — OPERATION & PARTS MANUAL — REV. #1 (11/27/06) — PAGE 13
GA-4.5R/GA-4.5RA — GENERAL INFORMATION
GA-4.5R/GA-4.5RA 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 MQ Model GA-4.5R andGA-4.5RA generators have 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.
These generators are 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.
These generators are 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),
GA-4.5RA has two.
■ NEMA L5-20R, twist-lock receptacle, (125V, 20 amps)
■ NEMA L5-30R, twist-lock receptacle, (125V, 30 amps)
■ NEMA L14-20R , twist-lock receptacle, (125/250V, 20 amps)
■ Circuit Breaker, 2-pole, 15 amps
■ AC Voltmeter
■ Operation Switch
■ Idle Control Switch
■ Full Power Switch
Excitation System
The GA-4.5R/GA-4.5RA 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 2A through 2E show the basic controls and
indicators for the GA-4.5R/ GA-4.5RA generators.
NOTE
In keeping with Multiquip's
policy of constantly
improving its products, the
specifications quoted herein
are subject to change without
prior notice.
Before connecting this generator to any building’s electrical
system, a
licensed electrician must install an isolation
(transfer) switch. Serious damage to the building’s
electrical system may occur without this transfer switch.
DANGER - ELECTRICAL SYSTEM HAZARDS