light
enough to be towed by a
pickup truck. 500 hour service interval
EPA & CARB CERTIFIED FOR
NON-ROAD MOBILE
APPLICATIONS
SOUND ATTENUATED
ENCLOSURE The fully weatherproof
enclosures incorporate
internally mounted exhaust
silencers and are of extremely
rugged construction in order
to withstand the rough
handling common on many
construction sites. Enclosures
are designed on modular
principles with many
interchangeable components
permitting on- site repair. Highly corrosion resistant
construction.
Body made from sheet
steel components
pretreated with zinc
phosphate prior to
polyester powder coating
at 392°F (200°C)
Black stainless steel
padlockable latches. Excellent access for
maintenance
One large door on each
side. One rear door for
distribution/control panel.
Front panel for air
discharge box access.
Lube oil and cooling water
drains piped to exterior of
the enclosure. Security and safety
Safety glass control panel
viewing window in a
lockable access door.
Emergency stop button
on enclosure exterior.
Cooling fan and battery
charging generator fully
guarded.
Lockable doors provide
exclusive access to fuel fill
and battery. Transportability
Tested and certified single
point lifting eye.
Lifting points on baseframe.
MULTI-VOLTAGE
DISTRIBUTION PANEL Switchable voltage output:
480/277 V 3 phase
208/120 V 3 phase
240/120 V single phase. Convenience outlets
mounted on control panel.
REAR CUSTOMER ACCESS Control panel access
through single door. Hinged door over main
connectors. Emergency stop on panel.
ENVIRONMENTALLY
FRIENDLY DESIGN EPA off-highway compliant
engine. UL double walled fuel tank
base with 24 hour minimum
fuel supply. Containment area for oil,
coolant and fuel spill.
OPTIONS Anti-Condensation Heater
110-120 volt AC Coolant Heater
110-120 volt AC Automatic Lube oil
make-up system 5A panel mounted UL
battery charger Electronic Governor
Refer to distribution panel
specifications for details.
STANDBY 20 kW
PRIME
18 kW
60 Hz S T A N D B Y
2 0 k W
P R I M E
1 8 k W
6 0 H z
LEHF2750-03 (05-04)
2
STANDARD FEATURES
1. ENGINE
Perkins Engine Co. heavy duty
industrial EPA compliant diesel engine.
1.1 Governor
Mechanical, compliant with BS5514,
Class A1.
1.2 Electrical System
12 Volt DC. Energized to run shutdown
solenoid. Oil pressure and coolant
temperature/level shutdown switches
and gauge senders.
3. ENGINE FILTRATION SYSTEM
Cartridge type dry air filters with
restriction indicator. Fuel water
separator in addition to engine filter.
Cartridge type fuel filters and full flow
lube oil filters.
All filters have replaceable elements.
4. EXHAUST SYSTEM
Critical Silencer with flexible connector.
All internal pipework lagged.
5. ELECTRICAL SYSTEM
12 Volt system with a 55 amp battery
charging alternator, starting motor and
battery mounted on the generator set
baseframe.
6. GENERATOR
Screen protected and drip-proof, self
exciting, self-regulating brushless
generator with fully interconnected
damper windings, IC06 cooling system
and sealed-for-life bearings.
6.1 Insulation System
The insulation system is Class H.
Windings are impregnated in a triple
dip thermo-setting moisture, oil and
acid resisting polyester varnish. Heavy
coat of anti-tracking varnish for
additional protection against moisture
or condensation.
6.2 Electrical Characteristics
Electrical design in accordance with
BS5000 Part 99, IEC60034-1,
EN61000-6, NEMA MG-1.22.
6.3 Automatic Voltage Regulator (AVR)
The fully sealed automatic voltage
regulator maintains the voltage within
the limits of ± 0.5% for 3 phase and ±
1% for single phase operation at
steady state from no load to full load.
Nominal adjustment is by means of
a trimmer incorporated in the AVR.
Voltage adjustment potentiometer on
the control panel.
6.4 Waveform Distortion, THF and TIF
Factors
The total distortion of the voltage
waveform with open circuit between
phases or phase and neutral is in the
order of 1.8. On a 3 phase balanced
harmonic-free load the total distortion
is <4%. Machines are designed to have
a THF less than 2% and a TIF less than
50. A 2/3 pitch factor is standard on all
stator windings.
6.5 Radio Interference
Suppression is in line with the
provisions of EN61000-6.
7. MOUNTING ARRANGEMENT
7.1 Baseframe
The complete generator set is mounted
on a heavy duty fabricated steel
baseframe. The baseframe includes
a UL listed closed top fuel tank and
incorporates specially designed
lifting points.
7.2 Coupling
The engine and generator are directly
coupled by means of an SAE flange
so there is no possibility of
misalignment after prolonged use.
The engine flywheel is flexibly coupled
to the generator rotor and a full
torsional analysis has been carried out
to guarantee no harmful vibration will
occur in the assembly.
7.3 Anti-Vibration Mounting Pads
Anti-vibration pads mounted between
the engine/generator feet and
baseframe, ensuring complete
isolation from vibration caused by
rotating components. As a result, the
machine may be placed on an uneven
surface without detrimental effects
from vibration.
7.4 Safety Guards
The fan, fan drive and battery charging
alternator drives are fully guarded for
personnel protection. All guards are to
OSHA standards.
8. FUEL SYSTEM
24 hour extended capacity fuel tank.
The entire fuel system is surrounded
by a catchment area to prevent
leakage. Three-way valves to allow
connection of auxiliary fuel tank.
9. CONTROL SYSTEM
9.1 Control Panel
Vibration isolated
NEMA 1 sheet steel enclosure with a
hinged lockable door.
a. DC and AC Wiring Harnesses
DC and AC wiring harnesses utilizing
industrial type multi-pin connectors
permit fast fault finding.
9.2 Circuit Breakers
UL and CSA-listed 3 pole molded case
circuit breaker mounted on the
generator set in a vibration isolated
NEMA 1 distribution panel.
9.3 Industry Standard 120V power
receptacles housed in a NEMA 1
distribution panel. Each receptacle is
protected by a circuit breaker which
also acts as an On/Off switch.
10. DOCUMENTATION
A full set of operation and maintenance
manuals, circuit wiring diagrams, and
instruction book is provided.
11. SOUND ATTENUATED
ENCLOSURES
A noise reducing enclosure surrounds
the entire generator set. Combined
with a critical engine silencer this
provides an overall noise reduction
from 65 dBA at 23 feet, through the
range.
12. FACTORY TESTS
The generator set is full load tested
before dispatch. All protective devices,
control functions and site load
conditions are simulated and the
generator and its systems checked,
proved and then passed for shipment.
A test certificate can be provided upon
request.
13. EQUIPMENT FINISH
All sheet metal components including
the enclosure and the base tank are
fully degreased, phosphated and
chromated for anti-corrosive protection
prior to painting with polyester powder.
The powder is cured at a temperature of
392°F (200°C) to ensure maximum scuff
resistance and durability. All fasteners
are electroplated. The engine and
generator are thoroughly cleaned and
finished in temperature controlled
ovens with industrial high gloss
polyurethane paint.
14. STANDARDS
The equipment meets the following
standards: BS4999, BS5000, BS5514,
IEC60034, EN61000-6, NEMA MG-1.22.
15. WARRANTY
Limited 12-month warranty from
startup. S T A N D B Y
2 0 k W
P R I M E
1 8 k W
6 0 H z
LEHF2750-03 (05-04)
3
GENERATOR
Voltage regulation . . . . . . . . . . . . . . ± 0.5% 3 phase at steady state
from no load to full load.
Frequency . . . . . . . . . . . . . . . . . . . . . ± 0.8% for constant load from
no load to 100% load
Waveform distortion. . . . . . . . . . . . . . . . . . THD <1.8%, at no load
Radio interference . . . . . . . . . . . . . . Compliance with EN61000-6
Telephone interference . . . . . . . . . . . . . . . . . . . . TIF <50, THF <2%
Overspeed limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2250 rpm
Insulation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Class H
Temperature rise . . . . . . . . . . . . . . . . . . . . . . Within Class H limits
Available voltages . . . . . . . . . . . . . . . . . . . . . 480/277 Volt 3 phase,
208/120 Volt 3 phase,
240/120 Volt single phase
Deration . . . . . . . . . . . . . . . Consult factory for available outputs
Ratings . . . . . . . . . . . . . . . . . . . . . At 86°F (30°C), 500 ft (152.4 m)
60% humidity, 0.8 pf (3-Phase),
1.0 pf (1-Phase)
ENGINE
Manufacturer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Perkins
Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 404C-22
Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-Cycle
Aspiration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Natural
Cylinder configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . In-line 4
Displacement cu. in. (L) . . . . . . . . . . . . . . . . . . . . . . . . . 135 (2.2)
Bore in (mm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3 (84)
Stroke in (mm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.9 (100)
Compression ratio. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23.3
Governor
Type. . . . . .