Generac Power Systems 09843-2 User Manual
m
Air-cooled Industrial
Mobile Generator
OWN ER'S MAN UAL
General
Information
Manual No. 99001
THIS SYMBOL POINTS OUT IMPORTANT SAFETY INSTRUCTIONS. WHICH. IF NOT FOLLOWED. COULD ENDANGER THE
PERSONAL SAFETY AND/OR PROPERTY OF YOURSELF AND OTHERS. READ AND FOLLOW ALL INSTRUCTIONS IN THE
MANUAL BEFORE ATTEMPTING TO OPERATE THIS UNIT.
Revision 0 (4/9/98)
®
CORPORATION
Model No. 09843-2 Series IM-72LP
Printed in U.S.A.
Generac IM-72LP Industrial Mobile Generator
THE MANUFACTURER SUGGESTS THAT THESE WES" FOR SAFE OPERATION BE COPIED AND POSTED IN
POTENTIAL HAZARD AREAS OF THE RECREATIONAL VEHICLE SAFETY SHOULD BE STRESSED TO ALL
OPERATORS AND POTENTIAL OPERATORS OF THIS EQUIPMENT.
WARNING;
The engine exhaust from this product
contains chemicals known to the State
of California to cause cancer, birth
defects, or other reproductive harm.
study these SAFETY RULES carefully before installing, operating or ser
vicing this equipment. Become familiar with the Owner’s Manual and with
the generator. The generator can operate safely, efficiently and reliably only
if it is properly installed, operated and maintained. Many accidents are
caused by failing to follow simple and fundamental rules or precautions.
Generac cannot possibly anticipate every possible circumstance that might
involve a hazard. The warnings in this Manual and on tags and decals affixed
to the unit, are therefore, not all-inclusive. If you use a procedure, work method
or operating technique Generac does not specifically recommend, you
must satisfy yourself that it is safe for you and others. You must also make
sure the procedure, work method or operating technique that you choose
does not render the generator to be unsafe.
• For fire safety, the auxiliary generator must be installed and maintained prop
erly. Installation must always comply with applicable codes, standards, laws
and regulations. Adhere strictly to local, state and national electrical and
building codes. Comply with regulations the Occupational Safety and Health
Administration (OSHA)have established. Also, the generator and related com
ponents must be installed completely in conformance with the manufacturer’s
instructions and recommendations. Following proper installation, do noth
ing that might alter a safe installation and render the unit in non-compliance
with such codes, standards, laws and regulations.
The Industrial Mobile Generator produces extremely high and dan
gerous electrical voltages and can cause dangerous, and possibly fatal,
electrical shock. Avoid contact with bare wires, terminals, etc. while
the unit is running. If you must work around an operating generator,
stand on an insulated, dry surface to reduce shock hazard.
A Never work on this equipment or handle any electrical device while
standing in water, while barefoot, or while hands or feet are wet. Dan
gerous electrical shock will result.
• Have the generator properly grounded (bonded) during installation onto
the vehicle, either by solid mounting to the vehicle frame or chassis or
by means of an approved bonding conductor. DO NOT disconnect the
bonding conductor, if so equipped. DO NOT reconnect the bonding con
ductor to any generator part that might be removed or disassembled during
routine maintenance. If the grounding conductor must be replaced, use
only a flexible conductor that is of No. 8 AWG copper wire minimum.
• Keep hands, feet, clothing, etc., away from drive belts, fans and other
moving parts of this equipment. Never remove any drive belt or fan
guards while the unit is operating.
• Inspect the generator periodically. Repair or replace all damaged or
defective parts immediately,
^ In case of accident caused by electric shock, shut down the source
of electrical power at once. If this cannot be done, free victim from live
conductor. AVOID DIRECT CONTACT WITH THE VICTIM. Use a dry
board, dry rope, or other non-conducting implement to free the victim
from live conductor. If victim is unconscious, apply first aid and get
medical help.
• Inspect fuel system frequently for leaks or damage. Repair or replace
any damaged or leaking component immediately. Never attempt to
change, alter or modify the generator fuel system in any way that might
affect safety or compliance with applicable codes and standards.
The generator engine gives off DEADLY carbon monoxide gas through
its exhaust system. This dangerous gas, if breathed in sufficient con
centrations, can cause unconsciousness or even death. This exhaust
system must have been properly installed, in strict compliance with
applicable codes and standards. Following installation, you must do
nothing that might render the system unsafe or in non-compliance with
such codes and standards. The generator compartment must be com
pletely vapor sealed from vehicle interior. There must be no possibility
of exhaust fumes entering the vehicle interior. Never operate this
equipment with a leaking or defective exhaust system.
• Never use the generator or any of its parts as a step. Stepping on the
unit can stress and break parts and may result in dangerous operating
conditions from leaking exhaust gases, fuel leakage, oil leakage, etc.
• Do not smoke around the generator. Wipe up any fuel, or oil spills imme
diately. Never leave oily or fuel soaked rags in the generator compartment
or on the generator itself. Keep the area around the generator clean and
free of debris.
• Adequate ventilation is required to expel toxic fumes and fuel vapors from
the generator compartment. Do not alter the installation of this equip
ment in any manner that might obstruct air and ventilation openings. Such
openings must be kept clear and unobstructed.
A Some generators may use LP gas (propane) as a fuel. LP gas is highly
EXPLOSIVE. The gas is heavier than air and tends to settle in low
areas where even the slightest spark can ignite the gas and cause an
explosion.
• Before performing any maintenance on the generator set, disconnect its
battery cables to prevent accidental start up. Disconnect the cable from
the battery post indicated by a NEGATIVE, NEG or (-) first. Reconnect
that cable last.
Industrial Mobile Generator
Generac IM-72LP Industriai Mobile Generator
IDENTIFI
CATION
RECORD
Please record the following information from the generator DATA DECAL or information decal.
1. Model Number
3. kW Rating.
________________________
2. Serial Number
4. Rated Voltage.
Data Decal
Industrial Mobile Generator
3
Generac IM-72LP Industrial Mobile Generator
SAFETY RULES
..................................
IDENTIFICATION RECORD
TABLE OF CONTENTS
...
.........2
...........................
.....3
.................................
4
Fuel Requirements...
Engine Oil Requirements
Engine Specifications.......
Generator Specifications
.......................................................11
READ THIS MANUAL THOROUGHLY
Operation and Maintenance..............
.............................
How to Obtain Service.....................................................5
..5
MAINTENANCE
Checking Engine Oil Level.
Change Engine Oil........................................................
GENERATOR FAMILIARIZATION
Generator Applicability
Installation
..........
................................................
6
..................................................... 6
Safety......................................................................... 6
Generator AC Connection System
OPERATION
Operating Precautions
Generator Control Panel
.......
...
............................
.6-7
................................................................................................................
...........................................
7
Optional Remote Start/Stop Panel........................................................................................
Before Starting the Engine
.............................................
..8
Starting the Generator............................................... 8-9
Stopping the Generator
25 Hour Break-In Period
25 Hour Check-Up Period
Attention Required After Submersion
Effects of Moisture and Dirt
Automatic Low Oil Pressure Shutdown.......................
High Oil Temperature Shutdown
Field Boost..............................................................
Over Voltage Protection
Engine Governed Speed ...........................................
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...
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............................9
9-10
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.......
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9
9
9
9
10
10
10
....10
Change Oil Filter
Engine Air Cleaner
........................................................
....................................................
Clean Air Intake Screen
Engine Spark Plug
.......................................
Spark Arrestor Muffler
Cleaning the Generator
Battery
........................................................................
Major Service Manual
Drive Belt
.......................................................................15
Exercising the Generator..
Out of Service Protection
Return the Unit to Service after Storage
TROUBLESHOOTING........................................................16
ELECTRICAL
REPAIR PARTS..........................................................18-29
CALIFORNIA EMISSION STATEMENT ....................30-31
WARRANTY .......................
...
............................................
..........................................
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11
....11
11
..12
12
12-13
13
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7
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13
13-14
14
14
14
.7
...............................................15
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.......................
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.15
15
back cover
SPECIFICATIONS
Industrial Mobile Generator
READ
THIS
MANUAL
Generac 1M-72LP Industrial Mobile Generator
READ THIS MANUAL THOROUGHLY
If you don't understand any portion of this manual, contact Gen
erac for a demonstration of actual starting, operating and
servicing procedures.
Throughout this publication and on tags and decals affixed to
the generator, DANGER and CAUTION blocks are used to alert
you to special instructions about a particular operation that may
be hazardous if performed incorrectly or carelessly. Observe
them carefully.
These safety warnings cannot eliminate the hazards that they
indicate. Strict compliance with the special instructions while
performing the service plus “common sense” are major mea
sures to prevent accidents.
The following definitions apply to DANGER, CAUTION and
NOTE blocks found throughout the manual.
DANGER: Indicates an immediately hazardous sit
uation which, if not avoided, will result in death or
serious injury. Danger is limited to the most
extreme situations.
WARNING: Indicates a potentially hazardous situ
ation which if not avoided, could result in death or
serious injury.
CAUTION: Indicates a potentially hazardous situa
tion which, if not avoided, may result in minor or
moderate injury. Caution may also be used to alert
against unsafe practices.
NOTE: After this heading you can read explanatory statements
that require special emphasis.
These symbols indicate the following:
Points out important safety information and, if not fol
lowed, could endanger personal safety and/or property
of yourself and others.
The operator (driver) is responsible for proper and safe use
of the vehicle, equipment on the vehicle, and the safety of all
vehicle occupants. We strongly recommend that the opera
tor read this Owner’s Manual and thoroughly understand ^11
instructions before using this equipment. We also strongly rec
ommend instructing other occupants in the vehicle to properly
start and operate the generator. This prepares them if they
need to operate the equipment in an emergency.
OPERATION AND MAINTENANCE
It is the operator's responsibility to perform all safety checks;
to make sure that all maintenance for safe operation is per
formed promptly: and to have the equipment checked by an
Authorized Dealer periodically. Normal maintenance service
and replacement of parts are the responsibility of the
Owner/Operator and, as such, are not considered defects in
materials or workmanship within the terms of the warranty. Indi
vidual operating habits and usage contribute to the need for
maintenance service.
Proper maintenance and care of your Industrial Mobile Gen
erator assures a minimum number of problems and keeps your
operating expenses at a minimum. See your authorized
Dealer/Distributor for service aids and accessories.
HOW TO OBTAIN SERVICE
When your Industrial Mobile Generator set requires servicing
or repairs, simply contact an Authorized Service Facility for
assistance. Service technicians are factory-trained and are
capable of handling ail of your service needs.
When contacting an Authorized Service Facility or the factory
about parts and service, always supply the complete model
number and serial number of your unit as given on its data
decal.
The warranty on your generator is included in the Owner’s
Manual, as well as listings for repair parts.
Potential explosion hazard.
Potential fire hazard.
A
Potential electrical shock hazard.
A
ndustrial Mobile Generator
GENERÄL
INFORMATION
Generac 1M-72LP Industrial Mobile Generator
GENERATOR APPLICABILITY
These generators have been designed and manufactured for
supplying electrical power for recreational vehicles. You should
not modify the generator or use it for any application other than
for what it was designed. If there are any questions pertain
ing to its application, write or call the factory. Do not use the
unit until you have been advised by a competent authority.
DANGER: FOR FIRE SAFETY, THE GENERATOR
MUST HAVE BEEN PROPERLY INSTALLED IN
A
COfyiPLIANCE WITH INDUSTRY STANDARDS. THE
GENERATOR ALSO MUST HAVE BEEN INSTALLED
IN STRICT COMPLIANCE WITH THE MANUFAC
TURER’S DETAILED INSTALLATION
INSTRUCTIONS. AFTER INSTALLATION, DO
NOTHING THAT MIGHT RENDER THE UNIT IN
NON-COMPLIANCE WITH SUCH CODES, STAN
DARDS AND INSTRUCTIONS.
You can use this generator to supply electrical power for oper
ating 120/240 volts, single phase, 60 Hertz, AC electrical
loads requiring the following:
Industrial
Generator
IM-72LP 7200 60
CAUTION: Do not overload the generator. Some
installations may require that electrical loads be
alternated to avoid overloading. Applying exces
sively high electrical loads may damage the
generator and may shorten its life. Add up the
rated watts of all electrical lighting, appliance, tool
and motor loads the generator will power at one
time. This total should not be greater than the
wattage capacity of the generator, if an electrical
device nameplate gives only volts and amps, multi
ply volts times amps to obtain watts (volts x amps
= watts). Some electric motors require more watts
of power (or amps of current) for starting than for
continuous operation.
Power
(wattage)
Amps at
120 Volts
Amps at
240 Volts
30
INSTALLATION
This Owner’s Manual has been prepared under the assump
tion that a competent, qualified technician installed the
generator into an industrial vehicle. We also assume the
installer complied with all applicable codes, standards and reg
ulations pertaining to installation.
Owners/Operators should make sure nothing is done during
installation that might render the unit unsafe or in noncompli
ance with applicable codes, standards and instructions. They
should be sure the unit has been installed to allow adequate
ventilation for cooling and exhaust air.
SAFETY
Before using the generator set, carefully read GENERAL
SAFETY RULES inside the cover. Comply with these RULES
to prevent accidents and damage to equipment and/or prop
erty. Generac suggests copying and posting the GENERAL
SAFETY RULES in potential hazard areas of the generator.
Safety should be stressed to all operators of this equipment.
GENERATOR AC CONNEQION
SYSTEM
This generator set is equipped with dual Stator AC power
windings. These two stator windings supply electrical power
to customer electrical loads by means of a dual 2-wire con
nection system. Note, however, that neutral is grounded.
The generator may have been installed so that units power
120/240 volts AC loads (Figure 1); or you can wire them to
connect only 120 volts AC electrical loads (Figure 2). Be sure
to install jumper wire between the circuit breakers and remove
bar in ciricuit breaker set (Figure 2) when reconnecting for 120
volts.
Figure 1 — Connections for 120/240 Volts
Industrial Mobile Generator
6
CIRCUrr BREAKER
Generac IM-72LP Industria! Mobile Generator
Figure 2 — Connections for 120 Volts
GENERATOR CONTROL PANEL -
Mounted on the generator control panel (Figure 3) are the fol
lowing features:
Figure 3 — Generator Control Panel
'tGA
PUSE MAIN
BREAKER
Fulvio?
STAFIT
OPERATING PRECAUTIONS
WARNING: NEVER OPERATE THE GENERATOR
SET WHILE THE VEHICLE IS PARKED OVER DRY
A
LEAVES, DRY GRASS OR ANY OTHER COM
BUSTIBLE SUBSTANCE. THE GENERATORS
EXHAUST SYSTEM BECOMES EXTREMELY HOT
AND CAN CAUSE FIRE IF IT IS TOO CLOSE TO
COMBUSTIBLE MATERIALS.
WARNING: THE GENERATORS EXHAUST
SYSTEM GIVES OFF DEADLY CARBON MONOX
IDE GAS. THIS DANGEROUS GAS, IF BREATHED
IN SUFFICIENT CONCENTRATIONS CAN CAUSE
UNCONSCIOUSNESS AND EVEN DEATH. NEVER
OPERATE THE GENERATOR SET WITH THE VEHI
CLE INSIDE ANY GARAGE OR OTHER ENCLOSED
AREA. NEVER OPERATE THE GENERATOR WITH
A LEAKING EXHAUST SYSTEM. CLOSE WIN
DOWS IN THE VICINITY OF THE GENERATOR
EXHAUST OUTLET AND TAKE ANY OTHER STEPS
THAT MAY BE NECESSARY TO PREVENT
EXHAUST GASES FROM ENTERING ROOMS OR
AREAS OCCUPIED BY PEOPLE OR ANIMALS.
FUEL PRIMER
Before starting a cold engine (it has not been started in more
than two weeks), you must press this switch to bring fuel from
the tank to the fuel pump. This rocker type switch springs back
into its original position when you release it.
START/STOP SWITCH
To crank and start the engine, hold this switch at its START
position. Release the switch when the engine starts. To stop
an operating engine, press and hold the switch in its STOP
position until the engine shuts off. The switch center position
is the RUN position.
FUSE
Protects the engine DC control circuit against electrical over
load. If the fuse element has melted open due to overloading,
the engine cannot be cranked. If you must replace it, use only
an identical replacement fuse.
MAIN BREAKER
Protects generators AC output circuit against overload and pro
vides a method of turning CFF the generators 120/240 volts
AC output to vehicle circuits (Figure 4).
Industrial Mobile Generator
7
Generac IM-72LP Industrial Mobile Generator
NOTE: Refer to THE GENERATOR AC CONNECTION
SYSTEM on page 4. Individual installations will differ. If an
overload occurs, the dual breaker will open the hot stator
leads (11 and 44). When the generator has been connected
for 120 volts only, either of the dual circuit breakers will open
stator AC output leads No. 11 and No. 33.
Figure 4 — Dual Circuit Breaker
30A.
30A.
OPTIONAL REMOTE
START/STOP PANEL
A remote mounted Start/Stop Panel is available, which allows
you to start and stop the generator engine conveniently from
inside the vehicle.
BEFORE STARTINC THE ENGINE
IMPORTANT: INSTRUCTIONS AND INFORMATION IN THIS
MANUAL ASSUME THE GENERATOR HAS BEEN PROP
ERLY INSTALLED, CONNECTED, SERVICED, TESTED AND
ADJUSTED BY A QUALIFIED INSTALLATION TECHNICIAN
OF INSTALLATION CONTRACTOR.
■ INSTALLATION
Generator installation must have been properly completed so
it complies with all applicable codes, standards and regula
tions and with the manufacturer's recommendations.
■ ENGINE LUBRiCATIQN__________________
Have engine crankcase properly serviced with recommended
oil before starting. Refer to "Maintenance" and "Specifica
tions" sections for oil servicing procedures and
recommendations.
CAUTION: Any attempt to crank or start the
engine before you have properly serviced it with
the recommended oil may result in engine failure.
___________
____
FUEL SUPPLY
The engine must have adequate supply of proper fuel to oper
ate. Before starting, check that sufficient fuel is available.
■ COOLING AND VENTILATING AIR
Air inlet and outlet openings in the generator compartment
must be open and unobstructed for continued proper operation.
Without sufficient cooling and ventilating air flow, the enginegenerator quickly overheats, which causes it to quickly shutdown.
Overheating could also damage the unit or your vehicle.
m ENGINE EXHAUST GAS
Before starting the generator engine, you should be sure there
is no way for exhaust gases to enter the vehicle interior and
endangering people or animals. Close windows, doors and
other openings in the vehicle that, if open, might permit exhaust
gases to enter the vehicle.
DANGER: THE GENERATOR ENGINE GIVES OFF
DEADLY CARBON MONOXIDE GAS THROUGH ITS
EXHAUST SYSTEM. THIS DANGEROUS GAS, IF
BREATHED IN SUFFICIENT CONCENTRATIONS,
CAN CAUSE UNCONSCIOUSNESS OR EVEN
DEATH. DO NOT OPERATE THE GENERATOR IF
ITS EXHAUST SYSTEM IS LEAKING OR HAS BEEN
DAMAGED. SYMPTOMS OF CARBON MONOXIDE
POISONING ARE (A) INABILITY TO THINK COHER
ENTLY,
(D) THROBBING TEMPLES, (E) DIZZINESS, (F)
HEADACHE, (G) WEAKNESS AND SLEEPINESS. IF
YOU FEEL ANY OF THESE SYMPTOMS, MOVE
INTO FRESH AIR IMMEDIATELY. IF SYMPTOMS
PERSIST, GET MEDICAL HELP.
STARTING THE GENERATOR
To start the generator from either the generator control panel
or from the optional Remote Panel, proceed as follows:
1. Turn OFF electrical loads, using whatever means provided
in your vehicle (such as a main line circuit breaker or trans
fer switch.
NOTE: If starting from the generator panel, turn OFF loads
by setting the generators main circuit breaker to “OFP or
“OPEN”. If starting from a Remote Panel, turn OFF loads using
whatever means is provided in the vehicle (such as a main cir
cuit breaker).
(B) VOMITING, (C) TWITCHING MUSCLES,
Industrial Mobile Generator
Generac IM-72LP Industria! Mobile Generator
2. If you have not started the engine in more that two weeks,
press the Fuel Pump Primer switch and hold it for about 30
seconds to activate the automatic shut-off function. How
ever, if the engine is warm, skip step 2.
3. To crank and start the engine, hold the start/stop switch at
START. Release the switch when the engine starts.
CAUTION: If the engine does not start after it has
been cranking for 15 seconds, release the
start/stop switch and try again. Holding the switch
for longer than 15 seconds can damage the starter
motor.
4. Let the engine run at no-load for a few minutes to stabilize
and warm up the engine.
5. Turn ON electrical loads, using whatever means provided
(such as a main circuit breaker or transfer switch).
STOPPING THE GENERATOR
1. Turn OFF all electrical loads, using whatever means pro
vided (such a main circuit breaker or transfer switch).
2. Place start/stop switch in its STOP position.
25 HOUR BREAK-IN PERIOD
The first 25 hours of operation is the break-in period for the
generator. Properly breaking in the generator is essential to
reducing oil consumption and enhancing engine performance.
During the break-in period, observe the following rules:
• For the first 25 hours, run the generator at varying electri
cal loads, to help set the engine piston rings properly.
• Following the initial 25 hour break-in period, avoid light elec
trical loads for the next 75 hours of operation. The unit should
be loaded at 50% (or more) of its capacity during those 75
hours. Repeated light loads during break-in period may
improperly seat the piston rings, resulting in blowby and high
oil consumption.
• Check oil level frequently during the break-in period. Add
oil if needed. It is natural for the generator engine to con
sume more oil than is normal until the piston rings have
seated properly.
• When the 25 hour break-in period is done, complete the
tasks recommended under 25 HOUR CHECK-UP PERIOD.
25 HOUR CHECK-UP PERIOD
After the first 25 hours of operation have been completed, con
tact an Authorized Service Facility for the following
maintenance. The Owner/Operator is responsible for any
changes.
• Change engine crankcase oil and oil filter.
• Check all cooling system ventilation openings on the vehi
cle.
• Check engine ignition system.
• Inspect the entire electrical system.
• Inspect the engine exhaust system.
AHENTION REQUIRED AFTER
SUBMERSION
if the generator has been submerged in water, it must NOT
be started or operated. Following any submersion in water,
have an authorized Generac Service Facility thoroughly clean
and dry the generator.
EFFECTS OF MOISTURE AND DIRT
Keep the generator set as clean and dry as possible. Protect
unit against excessive dust, dirt, corrosive vapors, road splash,
etc. Permitting dirt and moisture to accumulate on generator
windings will have an adverse effect on the insulation resis
tance of those windings.
When moisture is allowed to remain in contact with windings,
some of the moisture will be retained in voids and cracks in
the insulation. This causes a reduced insulation resistance and
will eventually cause problems. Dirt will make the problem
worse, since dirt tends to hold moisture in contact with wind
ings. Salt (as from sea air) will also worsen the problem since
it tends to absorb moisture from the air. Salt and moisture, when
combined, form a good electrical conductor.
AUTOMATIC LOW OIL PRESSURE
SHUTDOWN
The engine is equipped with a normally-closed (N.C.) oil pres
sure switch (Figure 5). Engine oil pressure holds the switch
open during cranking and operation. Should oil pressure drop
below about 8-10 psi, the switch contacts close and the engine
automatically shuts down.
Industrial Mobile Generator
9
Generac IM-72LP Industrial Mobile Generator
Figure 5 — Oil Pressure and Temperature Switches
HIGH TEMPERATURE SHUTDOWN
Temperature switch (Figure 5) with normally-open (N.O.) con
tacts is mounted on the engine. Should engine temperature
exceed about 284° F (140°C), the switch contacts close and
the engine shuts down.
OVER VOLTAGE PROTEQION
A solid state voltage regulator (Figure 7) controls the gener
ators AC output voltage. This regulator supplies an excitation
current to the rotor. By regulating the rotor’s excitation cur
rent, the strength of its magnetic field is regulated and, in
turn, the voltage delivered to connected electrical loads is
controlled. When the AC frequency is 60 Hz, voltage is reg
ulated at 120 volts (voltage-to-frequency ratio is 2-to-1).
Figure 7 — Solid State Voltage Regulator
^^[¿"Zh-SENSIIIG
CZ3=^4(+K TO BOTOI
i=3=-i{-b-^(iiœCT CURRENT)
----
—EXCITATION WniOING
ЬЕЙВИ STATOR
(ALTERNATING CURRENT)
FIELD BOOST
The controller Circuit Board houses a field boost diode and
resistor. These two components are part of a “field boost” cir
cuit (Figure 6).
Figure 6 — Field Boost Circuit
CLOSEST TO
BEARING
During engine cranking only, a positive DC (battery) voltage
is delivered through the diode, resistor, brushes and slip rings,
and to the generator rotor. Application of this voltage to the
rotor Hashes the field” whenever it is started. Flashing of the
field each time the generator starts makes sure that a suffi
ciently strong magnetic field is available to produce the required
“pick up” voltage in the stator windings.
The voltage regulator also incorporates a “voltage surge pro
tection circuit.” This circuit prevents troublesome surges in the
generator AC output voltage. Voltage surge is a common
cause of damage to electronic equipment.
ENGINE GOVERNED SPEED
The generator is equipped with a 2-pole revolving field (rotor)
which must be driven at 3600 rpm to produce the unit’s rated
AC frequency of 60 Hz. The gas engine governor was factory
set to about 62 Hz (2900 RPM) at no-load. After installing it,
the technician should check and adjust the governed speed.
Setting no-load frequency slightly high helps prevent exces
sive frequency, rpm and voltage droop under heavy electrical
loading.
DANGER: DO NOT TAMPER WITH THE ENGINE GOV
ERNOR SETTINGS. EXCESSIVELY HIGH ENGINE
SPEEDS ARE DANGEROUS AND INCREASE THE
RISK OF PERSONAL INJURY AND DAMAGE TO
EQUIPMENT AND/OR PROPERTY. EXCESSIVELY
LOW SPEEDS IMPOSE A HEAVY LOAD ON THE
ENGINE WHEN ADEQUATE ENGINE POWER IS NOT
AVAILABLE AND MAY SHORTEN ENGINE LIFE. THE
GENERATOR SUPPLIES CORRECT RATED FRE
QUENCY AND VOLTAGE ONLY AT THE PROPER
SPEED. SOME ELECTRICAL DEVICES MAY BE DAM
AGED BY INCORRECT FREQUENCY AND/OR
VOLTAGE. IF ENGINE SPEED APPEARS TO BE
INCORRECT, CONTACT YOUR NEAREST AUTHO
RIZED SERVICE FACILITY.
industrial Mobile Generator
10
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