Generac 00919-0, NP-50LPG User Manual
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.
Model No. 00919-0 Series NP-50LPG
GENERAC
®
CORPORATION
OWNER’S MANUAL
Manual No. A5596
General
General
Inf
Inf
ormation
ormation
Revision 1 (6/1/98) Printed in U.S.A.
GENERAC
®
Air-cooled Recreational
Vehicle Generator
Study these SAFETY RULES carefully before installing, operating or servicing this equipment. Become familiar with the Owner’ s Man ual and with
the generator. The generator can operate saf ely , efficiently and reliab ly 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 ev ery possible circumstance that might
involve a hazard. The w arnings 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 f or y ou 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
properly . Installation must always comply with applicab le 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) established. Also, the generator and
related components must be installed completely in conformance with
the manufacturer’ s instructions and recommendations. Following proper
installation, do nothing that might alter a safe installation and render the
unit in non-compliance with such codes, standards, laws and regulations.
The Recreational Vehicle Generator produces extremely high and
dangerous electrical voltages and can cause dangerous, and possibly fatal, electrical shock. A void 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.
Never work on this equipment or handle any electrical device while
standing in water, while baref oot, or while hands or feet are wet. Dangerous 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 NO T reconnect the bonding conductor 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. A V OID 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 wa y 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 concentrations, can cause unconsciousness or ev en 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 completely 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 immediately . Nev er leave oily or fuel soaked r ags in the generator compartment
or on the generator itself. K eep the area around the generator clean and
free of debris.
• Adequate ventilation is required to expel to xic fumes and fuel vapors from
the generator compartment. Do not alter the installation of this equipment in any manner that might obstruct air and ventilation openings. Such
openings must be kept clear and unobstructed.
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.
2
Recreational Vehicle Generator
Generac NP-50LPG Recreational Vehicle Generator
THE MANUFACTURER SUGGESTS THAT THESE “RULES” 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.
The engine exhaust from this product
contains chemicals known to the State
of California to cause cancer, birth
defects, or other reproductive harm.
WWAARRNNIINNGG::
GENERAC
®
CORPORATION
3
Recreational Vehicle Generator
Generac NP-50LPG Recreational Vehicle Generator
IDENTIFI-
CATION
RECORD
Please record the following information from the generator DATA DECAL or information decal.
1. Model Number_______________________ 2. Serial Number_________________
3. kW Rating___________________________ 4. Rated Voltage__________________
REFERENCE NUMBER IDENTIFICATION
1. Generator Air Intake Screen
2. Data Decal
3. Oil Dipstick
4. Oil Filler Cap
5. Oil Drain Plug
6. Oil Filter
7. Fuel Regulator
8. Fuel Solenoid
9. Fuel Inlet
10. Fuel Primer Switch
11. Circuit Breakers
12. Fuse
13. Engine Start/Stop Switch
14. Air Cleaner
15. Optional Remote Panel Receptacle
16. Generator AC Output Leads
17. Starter Contactor
1
2
3
4
5
6
7
8
9
10
11
13
14
15
16
GENERAC
®
CORPORATION
12
SIDE VIEW
17
4
Recreational Vehicle Generator
Generac NP-50LPG Recreational Vehicle Generator
TABLE
OF
CONTENTS
SAFETY RULES................................................................2
IDENTIFICATION RECORD..............................................3
GENERAL FEATURES ....................................................3
READ THIS MANUAL THOROUGHLY ............................5
Operation and Maintenance........................................................5
How to Obtain Service ................................................................5
GENERATOR FAMILIARIZATION ....................................6
Generator Applicability................................................................6
Installation ..................................................................................6
Safety..........................................................................................6
Generator AC Connection System..............................................6
OPERATION ................................................................7-11
Generator Control Panel ............................................................7
Optional Remote Start/Stop Panel..............................................7
Before Starting the Engine..........................................................8
Starting the Generator ............................................................8-9
Stopping the Generator ..............................................................9
Applying Loads to Generator ................................................9-10
Additional Information..........................................................10-11
SPECIFICATIONS ..........................................................12
Fuel Requirements....................................................................12
Engine Oil Requirements..........................................................12
Engine Specifications................................................................12
Generator Specifications ..........................................................12
MAINTENANCE ........................................................13-16
Checking Engine Oil Level ........................................................13
Change Engine Oil....................................................................13
Change Oil Filter ......................................................................13
Engine Air Cleaner....................................................................14
Clean Air Intake Screen............................................................14
Engine Spark Plug ....................................................................14
Spark Arrestor Muffler ..............................................................15
Cleaning the Generator ............................................................15
Battery ......................................................................................15
Major Service Manual ..............................................................16
Drive Belts ................................................................................16
Exercising the Generator ..........................................................16
Out of Service Protection..........................................................16
Return the Unit to Service after Storage ..................................16
TROUBLESHOOTING ....................................................17
REPAIR PARTS..........................................................20-29
ELECTRICAL DATA ..................................................18-19
EMISSIONS WARRANTY ..........................................30-31
BASIC 3-YEAR WARRANTY ...........................back cover
GENERAC
®
CORPORATION
5
Recreational Vehicle Generator
READ THIS MANUAL THOROUGHLY
If you don't understand any portion of this manual, contact Generac for a demonstration of actual starting, operating and
servicing procedures.
Throughout this publication and on tags and decals affixed to
the generator, D ANGER and CA UTION 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 measures to prevent accidents.
The following definitions apply to D ANGER, WARNING, CA UTION and NOTE blocks found throughout the manual.
DANGER: AFTER THIS HEADING YOU CAN READ
HANDLING, INSTALLING, OPERATING OR SERVICING INSTRUCTIONS THAT, IF NOT COMPLIED
WITH, WILL RESULT IN PERSONAL INJURY.
WARNING: AFTER THIS HEADING YOU CAN READ
HANDLING, INSTALLING, OPERATING OR SERVICING INSTRUCTIONS THAT, IF NOT COMPLIED
WITH, MAY RESULT IN PERSONAL INJURY.
CAUTION: After this heading you can read instructions for handling, installing, operating or
servicing the generator that, if not strictly complied with, may result in damage to equipment
and/or property.
NOTE: After this heading you can read explanatory statements
that require special emphasis.
These symbols indicate the following:
The operator (owner) is responsible for proper and safe use
of the vehicle, equipment on the v ehicle, and the safety of all
vehicle occupants. We strongly recommend that the operator read this Owner’s Manual and thoroughly understand all
instructions before using this equipment. We also strongly recommend 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 performed 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 . Individual operating habits and usage contribute to the need for
maintenance service.
Proper maintenance and care of your recreational vehicle
generator assures a minimum number of problems and keeps
your operating expenses at a minim um. See your authorized
Dealer/Distributor for service aids and accessories.
HOW TO OBTAIN SERVICE
When your recreational vehicle generator set requires servicing
or repairs, simply contact an Authorized Service Facility for
assistance. Service technicians are factory-trained and are
capable of handling all of your service needs.
When contacting an Authorized Service Facility or the f actory
about parts and ser vice, 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.
Generac NP-50LPG Recreational Vehicle Generator
RR
EE AA
DD
TT
HHII
SS
MM
AANNUUAA
LL
Points out important safety information and, if not followed, could endanger personal safety and/or property
of yourself and others.
Potential explosion hazard.
Potential fire hazard.
Potential electrical shock hazard.
GENERAC
®
CORPORATION
SERVICE DEALER LOCATION
TO LOCATE THE NEAREST GENERAC SERVIC-
ING DEALER, PLEASE CALL OUR 800 NUMBER.
ONLY DEALER LOCATION INFORMATION CAN BE
OBTAINED AT THIS NUMBER.
1-800-333-1322
6
Recreational Vehicle Generator
Generac NP-50LPG Recreational Vehicle Generator
GENERATOR APPLICABILITY
These generators have been designed and manuf actured f or
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 pertaining 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
COMPLIANCE WITH (1) ANSI 119.2-1975/NFPA
501C-1974 “STANDARD FOR RECREATIONAL
VEHICLES, PART III, “INSTALLATION OF ELECTRICAL SYSTEMS.” THE GENERATOR ALSO MUST
HAVE BEEN INSTALLED IN STRICT COMPLIANCE
WITH THE MANUFACTURER’S DETAILED INSTALLATION INSTRUCTIONS. AFTER INSTALLATION,
DO NOTHING THAT MIGHT RENDER THE UNIT IN
NON-COMPLIANCE WITH SUCH CODES, STANDARDS AND INSTRUCTIONS.
You can use this generator to supply electrical power for operating 120/240 volts, single phase, 60 Hertz, AC electrical
loads. These loads can require up to 4500 watts of (4.5kW)
of power, but cannot exceed 37.5 AC amperes of current at
120 volts or exceed 18.8 AC amperes at 240 volts.
CAUTION: Do not overload the generator. Some
installations may require that electrical loads be
alternated to avoid overloading. Applying excessively 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, multiply 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.
INSTALLATION
This Owner’s Manual has been prepared under the assumption that a competent, qualified technician installed the
generator. We also assume the installer complied with all
applicable codes, standards and regulations pertaining to
installation.
Owners/Operators must make sure to do nothing that might
render the installation unsafe or in noncompliance with applicable codes, standards and instructions. They should be sure
the unit has been installed to allow adequate ventilation f or cooling and exhaust air.
SAFETY
Before attempting to use the generator set, carefully read
GENERAL SAFETY RULES inside the cover of this Manual.
Comply strictly with these RULES to prevent accidents and
damage to equipment and/or property. W e suggest that copying and posting GENERAL SAFETY RULES in potential hazard
areas of the vehicle. Stress saf ety to all operators and potential operators of this equipment.
GENERATOR AC CONNECTION
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 connection system. Note, however, that neutral is grounded.
The generator may hav e been installed so that the unit powers
120 volt AC loads (Figure 1); or y ou can wire them to connect
both 120 and/or 240 volt AC electrical loads. Be sure to install
jumper wire between the circuit breakers when reconnecting
for 120/240 volts. Refer to the Installation Manual for more
information.
Figure 1 — Connections for 120 Volts Only
GENERAL
INFORMA-
TION
GENERAC
®
CORPORATION
7
Recreational Vehicle Generator
Generac NP-50LPG Recreational Vehicle Generator
GENERATOR CONTROL PANEL
Mounted on the generator control panel (Figure 2) are the following features:
Figure 2 — Generator Control Panel
FUEL PRIMER
Before starting a cold engine (if it has not been started in more
than two weeks), you must press this s witch to bring fuel from
the tank to the fuel regulator. This roc ker type s witch springs
back into its original position when you release it.
START/STOP SWITCH
To crank and star t 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 overload. 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 ov erload and provides a method of turning OFF the generators 120/240 volts
AC output to vehicle circuits . The NP-50LPG has one 20 amp
breaker and one 30 amp breaker.
NOTE: If the Series NP-50LPG has been reconnected for dual
voltage AC output (120/240 volts), you can install line breakers having an amperage rating that is different than stated
above. The replacement line breakers consist of two separate breakers with a connecting piece between the breaker
handles (so that both breakers will operate at the same time).
If the unit is reconnected for dual voltage , IT IS NO LONGER
RVIA LISTED.
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.
Figure 3 — Optional Remote Panel (Model 9042)
GENERAC
®
CORPORATION
8
Recreational Vehicle Generator
BEFORE STARTING THE ENGINE
IMPORTANT: INSTRUCTIONS AND INFORMATION IN THIS
MANUAL ASSUME THE GENERATOR HAS BEEN PROPERLY INST ALLED , CONNECTED , SERVICED , TESTED AND
ADJUSTED BY A QUALIFIED INSTALLA TION TECHNICIAN
OR INSTALLATION CONTRACTOR.
INSTALLATION
Generator installation must have been properly completed so
it complies with all applicable codes, standards and regulations and with the manufacturer's recommendations.
ENGINE LUBRICATION
Have engine crankcase properly serviced with recommended
oil before starting. Refer to MAINTENANCE and SPECIFICATIONS 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 an engine failure.
FUEL SUPPLY
The engine must have adequate supply of proper fuel to operate. Before starting, check that sufficient fuel is available.
COOLING AND VENTILATING AIR
Air inlet and outlet openings in generator compartment must
be open and unobstructed for continued proper operation.
Without sufficient cooling and ventilating air flow, the enginegenerator quickly ov erheats which causes it to shutdown and
it could damage the generator.
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
endanger 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
THE EXHAUST SYSTEM IS LEAKING OR HAS
BEEN DAMAGED. SYMPTOMS OF CARBON
MONOXIDE POISONING ARE (a) inability to think
coherently; (b) vomiting; (c) twitching muscles; (d)
throbbing temples; (e) dizziness; (f) headaches;
(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
IMPORTANT: Read the vehicle manufacturer’s instructions.
The owner/operator should become familiar with the vehicle
in which the generator is installed. Differences e xist between
vehicles. For example, some vehicles may use a transfer
switch to isolate dockside pow er from the generator, while other
vehicles may use an isolating receptacle . Some vehicles ma y
be equipped with a DC converter which allows the generator
to power certain DC lighting and other DC loads.
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 whatev er means provided
in your vehicle (such as a main line circuit breaker or tr ansfer switch).
NOTE: If star ting from the generator panel, turn OFF loads
by setting the generator’s main circuit breaker to “OFF” or
“OPEN”. If starting from a Remote Panel, turn OFF loads using
whatever means is pro vided in the vehicle (such as a main circuit breaker). Electrical load circuits will be turned ON after
the generator has started, stabilized and warmed up.
2. If you have not started the engine in more than two weeks,
press the Fuel Primer switch and hold it for about 30 seconds
to prime fuel system. However , if the engine is warm, skip Step
2.
Generac NP-50LPG Recreational Vehicle Generator
GENERAC
®
CORPORATION
9
Recreational Vehicle Generator
3.Hold the engine Start/Stop Switch at START to crank engine.
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 fe w min utes to stabiliz e
and warm up.
5.Tur n ON electrical loads, using whatever means provided
(such as a main circuit breaker or transfer switch).
STOPPING THE GENERATOR
1.Tur n OFF all electrical loads, using whatever means provided (such as a main circuit breaker or transfer switch).
2.Let unit run a few minutes to stabilize temperature.
3.Hold the Start/Stop switch in its STOP position until engine
comes to a complete stop.
APPLYING LOADS TO GENERATOR
When applying electrical loads to the generator, observe these
guidelines:
Before applying electrical loads, let the generator stabilize
and warm up for a minute or two.
DO NOT overload the generator.
LET ENGINE STABILIZE
The generator supplies correct rated voltage only at proper
governed speed. Some electrical appliances may be extremely
sensitive to voltage. Incorrect voltages can damage those
appliances.
If electrical loads are applied at reduced operating speeds,
such loads imposed on the engine when sufficient power is not
available may shorten engine life. Never turn ON electrical
loads until after the generator engine has started and stabilized ON-speed.
DO NOT OVERLOAD THE GENERATOR
You can read the rated wattage/amperage capacity of your generator on the generator data decal (see “Identification Record”
on Page 3).
Applying electrical loads in excess of the unit’s rated capacity will cause the engine-generator to automatically shutdown.
T o av oid overloading, add up the wattage of all connected electrical lighting, appliance, tool and motor loads. This total should
not be greater than the generator’ s r ated w attage capacity.
Most lighting, appliance, tool, and motor loads indicate their
required watts on their nameplate or data plate. For light
bulbs, simply note the wattage rating of the bulb.
If a load does not show its rated wattage, multiply that load’ s
rated VOLTS times AMPS to obtain WATTS.
Generac NP-50LPG Recreational Vehicle Generator
RUNNING
WATTS
*Air Conditioner (12,000 Btu)..........................................1700
Battery Charger (20 amp) ................................................500
Belt Sander (3”) ..............................................................1000
Chain Saw ......................................................................1200
Circular Saw (6-12”) ............................................800 to 1000
Coffee Maker ..................................................................1000
*Compressor (1HP) ........................................................2000
*Deep Freeze....................................................................500
Disc Sander (9”)..............................................................1200
Electric Range (one element) ........................................1500
Electric Skillet..................................................................1250
*Furnace Fan (1/3 HP)....................................................1200
Hair Dryer........................................................................1200
Hand Drill (1”)..................................................................1100
Hedge Trimmer ................................................................450
Impact Wrench..................................................................500
RUNNING
WATTS
Lawn Mower....................................................................1200
Light Bulb..........................................................................100
Microwave Oven................................................................700
*Milk Cooler ....................................................................1100
Oil Burner on Furnace ......................................................300
Oil Fired Space Heater (140,000 Btu) ..............................400
*Paint Sprayer, Airless (1/3 HP)........................................600
Radio........................................................................50 to 200
*Refrigerator......................................................................600
Slow Cooker......................................................................200
*Submersible Pump (1-1/2 HP) ......................................2800
*Submersible Pump (1 HP) ............................................2000
*Table Saw (10”) ................................................1750 to 2000
Television ..........................................................1750 to 2000
* Allow 2-1/2 times the listed watts for starting these devices.
WATTAGE REFERENCE GUIDE
GENERAC
®
CORPORATION
10
Recreational Vehicle Generator
Induction type motors (such as those that run the vehicle’s
furnace fan, refrigerator, air conditioner , etc.) need about 21/2 time more watts of power for starting than for running
(for a fe w seconds during motor starting). Be sure to allow
for this when connecting electrical loads to the generator.
First, figure the watts needed to start electric motors in the
system. To that figure, add the running wattages of other
items that will be operated by the generator.
Do not apply heavy electrical loads for the first two or three
hours of operation.
ADDITIONAL INFORMATION
This section discusses some the the engine protective devices ,
overload protection and breaking in a new generator.
AUTOMATIC LOW OIL PRESSURE
SHUTDOWN
The engine is equipped with a normally-closed (N.C.) oil pressure switch (Figure 4). Engine oil pressure holds the switch
open during cranking and operation. Should oil pressure drop
below a pre-set lev el, the switch contacts close and the engine
automatically shuts down.
HIGH TEMPERATURE SHUTDOWN
A temperature switch (Figure 4) with normally-open (N.O.) contacts is mounted near the oil filter. If engine temperature w ere
to exceed about 284°F (140°C), the switch contacts close
and the engine shuts down.
Figure 4 — Switches for Engine
Safety Shutdown
FIELD BOOST
The Controller Circuit Board houses a field boost diode and
resistor which are part of a “field boost” circuit (Figure 5).
During engine cranking only, a positive DC (battery) voltage
is delivered through the diode, resistor , brushes and slip rings,
and the generator rotor. Application of this voltage to the
rotor “flashes the field” whenever it is started. Flashing of the
field each time the generator starts makes sure that a sufficiently strong magnetic field is available to produce “pick-up”
voltage in the stator windings.
Figure 5 — Field Boost Circuit
OVERVOLTAGE PROTECTION
A solid state voltage regulator (Figure 6) controls the generator’s A C output voltage. This regulator supplies an e xcitation
current to the rotor. By regulating the rotor’s excitation current, 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 regulated at 120 volts (voltage-to-frequency ratio is 2-to-1).
Figure 6 — Solid State Voltage Regulator
Generac NP-50LPG Recreational Vehicle Generator
HIGH TEMPERATURE
SWITCH
LOW OIL PRESSURE SWITCH
GENERAC
®
CORPORATION
Loading...