TLD GPU-4060 Series User Manual

Creation:03.09 — 2009 1-1-5
Description
B. Generator System
The GPU-4060 Series generator system is an extremely simple system which contains very
few components. It can utilize either the TLD, Kato, or Marathon brand generators. All are
direct drop-in replacements. The other major assembly of the generator system is the
electrical box assembly, which contains the generator control module, instrument panel
controls, and a relay panel.
1. Generator:
The 400 Hz generator is a brush-less, revolving field, three phase, synchronous,
alternating current generator of single bearing construction. Generator excitation
current is supplied from a direct connected brush-less rotating D.C. exciter. The
generator stator core is constructed of one piece steel laminations. The steel
laminations are assembled under pressure to form the stator core. The assembled core
is rigidly welded to the frame ribs, and heavily insulated stator coils of the highest quality
magnetic copper are then inserted in the stator slots. The stator core slots are insulated
with the highest quality insulating material.
The complete assembly is vacuum pressure impregnated with epoxy resin and
thermally cured to ensure excellent bonding qualities, high dielectric strength and
maximum moisture resistance. The generator field poles are mounted on a large
diameter shaft. Field coils of heavily insulated wire are machine wound directly onto the
poles. The coils are blocked and braced for physical strength and rigidity. The entire
rotor is vacuum pressure impregnated with 100% epoxy resin to form one complete,
homogeneous mass. The exciter armature and rotating rectifier bridge assembly are
sleeve mounted on the shaft of the synchronous generator. The rotating rectifier
assembly consists of a full wave rectifier bridge made up of six semiconductor devices
mounted on aluminum heat sink.
During operation, the three-phase power generated in the exciter armature is applied
directly to the rotating rectifier assembly. The forward polarity rectifiers mounted on one
heat sink and the reverse polarity rectifiers on the other heat sink are connected to form
a three phase full wave rectifier bridge. The rotating rectifier bridge assembly rectifies
the alternating current supplied by the exciter armature. The direct current output of the
rotating rectifier bridge assembly is in turn applied to the rotating field of the generator
via lead wires routed through a key way shaped slot on the rotor shaft. Excitation
current for the stationary field coils is supplied by the synchronous generator through
the Generator Control Module.
A heavy duty "greaseable" bearing is used to support the generator rotor for prolonged
operating life. Grease fitting and grease relief are installed on the generator housing for
easy lubrication of the bearing.
The generator is designed with a self-contained cooling system which circulates coolant
air through the machine. Ambient air is drawn into the machine through louvered
openings at the exciter end of the machine by a large capacity blower. The warm air is
exhausted to the atmosphere through the screened opening enclosing the blower
assembly. The complete generator is bolted to the engine flywheel housing.
In order to absorb the counter EMF which is present during NO BREAK POWER
TRANSFER, a ring resistor (field discharge resistor) has been added across the main
rotor windings, and over-sized diodes have also been added in the rotating rectifier
assembly.

TLD GPU-4060 Series Specifications

General

Brand	TLD
Model	GPU-4060 Series
Category	Portable Generator
Language	English