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GDP-5H A.C. GENERATOR — PARTS & OPERATION MANUAL — REV. #2 (10/05/05) — PAGE 15
GDP-5H — GENERAL INFORMATION
GDP-5H FAMILIARIZATION
Generator
The Multiquip Model GDP-5H generator has 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. In addition
the Model GDP-5H has been designed as a power source
for 180 Hz, 3-phase concrete vibrators or other equipment
that may require 3-phase power for operation.
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. See Figures 4A through
4E for the basic controls and indicators for the GDP-5H
generator.
This portable generator is 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:
■
Three 230V twist-lock output receptacles (three phase).
■
240V twist-lock output receptacle (single phase).
■
120V twist-lock receptacle (single phase).
■
120V GFCI duplex output receptacle, (single phase).
■
60 Hz (single phase) circuit breaker.
■
180 Hz (three phase) earth leakage circuit breaker.
■
AC Voltmeter
■
Ground Terminal
■
Full Power Switch
■
Idle Control Switch
■
Operation Switch
Excitation System
The GDP-5H-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
This generator is powered by a 11 HP, air-cooled, 4-stroke
HONDA gasoline engine. Reference Table 2, for engine
specifications.
3-Phase Vibrator Application
When using this generator with 3-phase vibrators do the
following:
■
ALWAYS use a vibrator with short circuit protection.
■
ALWAYS use rubber boots and gloves when operating the
vibrator.
■
ALWAYS use adequate size connecting cable for extension.
■
ALWAYS maintain electrical cords in good condition and
frequently replace the entire cable of the vibrator with a new
one.
Before connecting this generator 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.
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