Multiquip MQ Multiquip Portable Generators ga-6h - Manual (Page 15)

GA-6H/GA-6HA A.C. GENERATORS — OPERATION & PARTS MANUAL — REV. #0 (06/02/05) — PAGE 15
GA-6H/GA-6HA — GENERAL INFORMATION
GA-6H/GA-6HA FAMILIARIZATION
Generator
The Multiquip GA-6H and GA-6HA generators have been
designed as a portable dual purpose power source for 60
Hz (single phase) lighting facilities, power tools, submersible
pumps and other industrial and construction machinery.
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
generators to protect against damage. See Figures 3A
through 3E for the basic controls and indicators for the GA-
6H/GA-6HA generators.
These portable generators are supplied with a electrical
control box. To reduce vibration caused by the engine, the
control box is also placed on rubber isolators.
Control Box
The control box is provided with the following:
■ 120/240V twist-lock output receptacle (single phase) .
■ 120V twist-lock receptacle (2) (single phase).
■
120V GFCI single phase duplex output receptacle (GA-
6HA has two).
■
21 amp main circuit breaker .
■ AC Voltmeter
■ Ground Terminal
■ Full Power Switch
■ Idle Control Switch
■ Operation Switch
Excitation System
The GA-6H/GA-6HA-series generators use a magnet
attached to a flywheel to produce AC voltage from a lamp
coil beneath the flywheel. As the magnetic 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.
Alternator
The alternator, a brushless revolving-field type, is
permanently aligned to the engine through rigid coupling.
Engine
These generators are powered by a 11 HP, air-cooled, 4-
stroke
HONDA gasoline engine. Reference Table 2, for
engine specifications.
Before connecting this generators to any building’s
electrical system, a licensed electrician must install an
isolation (transfer) switch.
Serious injury or death may result without this transfer
switch.
WARNING WARNING WARNING WARNING WARNING