TLD GPU-409 User Manual

Creation: 01.31 - 2014 1-1-8
GPU - 406
GPU
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409
C. Generator System
The generator system is a simple system which contains few components. The unit utilizes a TLD
brand generator. 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.
Generator:
The 400 Hz generator is a brushless, revolving-field, three-phase, synchronous, alternating-current
generator of single-bearing construction. Generator excitation current is supplied from a directly-
connected brushless 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 generator field poles are mounted on a large-diameter shaft. Field coils of heavily insulated wire
are wound directly onto the poles. The coils are blocked and braced for physical strength and rigidity.
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 in a potted enclosure.
The generator‘s brushless exciter is an inverted synchronous AC generator with the field winding
stationary and the three-phase armature windings rotating with the generator rotor. The stationary
exciter field (stator) is designed to be the primary source of the generator’s residual magnetism. This
residual magnetism allows the exciter armature (rotor) to produce AC voltage even when the exciter
field (stator) is not powered. This AC voltage is rectified to DC by the rotating rectifier assembly and
fed directly to the main field (rotor). As the generator shaft continues to rotate, the main field (rotor)
induces a voltage into the generator’s main armature (stator).
The voltage regulator is powered by the GPU diesel engine’s charging system. This system of using
an external voltage source to provide the excitation current for the generator eliminates the need for a
special field flashing circuit in the regulator.
The generator is designed with a self-contained cooling system which circulates cool 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.
Generator electrical characteristics:
- Phase imbalance: Not to exceed 1% at balanced 3- phase load. Not to exceed 4% at 1/3
load on 1 phase and no-load on the other 2 phases.
- Harmonic content: Total harmonic distortion not to exceed 2%. Any single phase
harmonic not to exceed 1.5% at 0.8 P.F. linear load.
- Crest factor: 1.414 +/- 0.007
- Frequency regulation: +/- 0.1% no-load to full-load and overload.
- Frequency transient: +/- 2.5% no-load to full load
- Frequency transient recovery time: +/- 0.5% of nominal frequency within 1.5 seconds.
- Overload rating: 125% for 5 minutes.

TLD GPU-409 Specifications

General

Brand	TLD
Model	GPU-409
Category	Portable Generator
Language	English