CUMMINS Detector Series, GGHB, Sentinel Series, GGHC, GGHD Operator's Manual
Models
GGHB
GGHC
GGHD
Detector™/Sentinel™ Controls
GENERATOR SETS
Printed in U.S.A. 928-0133B 11-98
Safety Precautions
Before operating the generator set (genset), read the
Operator’s Manual and become familiar with it and the
equipment. Safe and efficient operation can be
achieved only if the equipment is properly operated
and maintained. Many accidents are caused by failure
to follow fundamental rules and precautions.
The following symbols, found throughout this manual,
alert you to potentially dangerous conditions to the operator, service personnel, or the equipment.
This symbol warns of immediate
hazards which will result in severe personal injury or death.
WARNING
This symbol refers to a hazard or unsafe practice which can result in severe personal injury or death.
CAUTION
This symbol refers to a hazard or unsafe practice which can result in personal injury
or product or property damage.
FUEL AND FUMES ARE FLAMMABLE
Fire, explosion, and personal injury or death can result
from improper practices.
• Be sure all fuel supplies have a positive shutoff
valve.
• Be sure battery area has been well-ventilated prior
to servicing near it. Lead-acid batteries emit a highly
explosive hydrogen gas that can be ignited by arcing, sparking, smoking, etc.
EXHAUST GASES ARE DEADLY
Provide an adequate exhaust system to properly
•
expel discharged gases away from enclosed or
sheltered areas and areas where individuals are
likely to congregate. Visually and audibly inspect
the exhaust daily for leaks per the maintenance
schedule. Make sure that exhaust manifolds are secured and not warped. Do not use exhaust gases to
heat a compartment.
• Be sure the unit is well ventilated.
• Engine exhaust and some of its constituents are
known to the state of California to cause cancer,
birth defects, and other reproductive harm.
MOVING PARTS CAN CAUSE SEVERE
PERSONAL INJURY OR DEATH
• DO NOT fill fuel tanks while engine is running, un-
less tanks are outside the engine compartment.
Fuel contact with hot engine or exhaust is a potential
fire hazard.
• DO NOT permit any flame, cigarette, pilot light,
spark, arcing equipment, or other ignition source
near the generator set or fuel tank.
• Fuel lines must be adequately secured and free of
leaks. Fuel connection at the engine should be
made with an approved flexible line. Do not use
copper piping on flexible lines as copper will become brittle if continuously vibrated or repeatedly
bent.
• Natural gas is lighter than air, and will tend to gather
under hoods. Propane is heavier than air, and will
tend to gather in sumps or low areas. NFPA code requires all persons handling propane to be trained
and qualified.
• Keep your hands, clothing, and jewelry away from
moving parts.
• Before starting work on the generator set, discon-
nect battery charger from its AC source, then disconnect starting batteries, negative (-) cable first.
This will prevent accidental starting.
• Make sure that fasteners on the generator set are
secure. Tighten supports and clamps, keep guards
in position over fans, drive belts, etc.
• Do not wear loose clothing or jewelry in the vicinity of
moving parts, or while working on electrical equipment. Loose clothing and jewelry can become
caught in moving parts. Jewelry can short out electrical contacts and cause shock or burning.
• If adjustment must be made while the unit is run-
ning, use extreme caution around hot manifolds,
moving parts, etc.
MS-1
iii
ELECTRICAL SHOCK CAN CAUSE
SEVERE PERSONAL INJURY OR DEATH
•
Remove electric power before removing protective
shields or touching electrical equipment. Use rubber insulative mats placed on dry wood platforms
over floors that are metal or concrete when around
electrical equipment. Do not wear damp clothing
(particularly wet shoes) or allow skin surface to be
damp when handling electrical equipment.
• Use extreme caution when working on electrical
components. High voltages can cause injury or
death. DO NOT tamper with interlocks.
• Follow all applicable state and local electrical
codes. Have all electrical installations performed by
a qualified licensed electrician. Tag and lock open
switches to avoid accidental closure.
• DO NOT CONNECT GENERATOR SET DI-
RECTLY TO ANY BUILDING ELECTRICAL SYS-
TEM. Hazardous voltages can flow from the gen-
erator set into the utility line. This creates a potential
for electrocution or property damage. Connect only
through an approved isolation switch or an ap-
proved paralleling device.
GENERAL SAFETY PRECAUTIONS
Coolants under pressure have a higher boiling point
•
than water. DO NOT open a radiator or heat ex-
changer pressure cap while the engine is running.
Allow the generator set to cool and bleed the system
pressure first.
• Benzene and lead, found in some gasoline, have
been identified by some state and federal agencies
as causing cancer or reproductive toxicity. When
checking, draining or adding gasoline, take care not
to ingest, breathe the fumes, or contact gasoline.
• Used engine oils have been identified by some state
or federal agencies as causing cancer or reproductive toxicity. When checking or changing engine oil,
take care not to ingest, breathe the fumes, or con-
tact used oil.
• Provide appropriate fire extinguishers and install
them in convenient locations. Consult the local fire
department for the correct type of extinguisher to
use. Do not use foam on electrical fires. Use extin-
guishers rated ABC by NFPA.
• Make sure that rags are not left on or near the en-
gine.
• Remove all unnecessary grease and oil from the
unit. Accumulated grease and oil can cause over-
heating and engine damage which present a poten-
tial fire hazard.
• Keep the generator set and the surrounding area
clean and free from obstructions. Remove any de-
bris from the set and keep the floor clean and dry.
• Do not work on this equipment when mentally or
physically fatigued, or after consuming any alcohol
or drug that makes the operation of equipment un-
safe.
• Substances in exhaust gases have been identified
by some state or federal agencies as causing can-
cer or reproductive toxicity. Take care not to breath
or ingest or come into contact with exhaust gases.
KEEP THIS MANUAL NEAR THE GENSET FOR EASY REFERENCE
iv
Table of Contents
SECTION TITLE PAGE
SAFETY PRECAUTIONS iii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 INTRODUCTION
General 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How to Obtain Service 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 SPECIFICATIONS 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 OPERATION (DETECTOR CONTROL)
General 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Prestart Checks 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control Panel 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Generator AC Voltage Regulator 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine Control Module 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starting 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stopping 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 TROUBLESHOOTING (DETECTOR CONTROL)
Safety Considerations 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting Charts 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 OPERATION (SENTINEL CONTROL)
General 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Prestart Checks 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control Panel 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Generator AC Voltage Regulator 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine Monitoring 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starting 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stopping 5-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 TROUBLESHOOTING (SENTINEL CONTROL)
Safety Considerations 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting Charts 6-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
!!
The engine exhaust from this product
contains chemicals known to the State
of California to cause cancer, birth
defects or other reproductive harm.
i
SECTION TITLE PAGE
7 MAINTENANCE
General 7-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance Schedule 7-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Generator Set Inspection 7-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lubrication System 7-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cooling System 7-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air Filter 7-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Drive Belt 7-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ignition System 7-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery 7-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Out-of-Service Protection 7-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8 ADJUSTMENTS
Output Voltage Adjustment 8-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel System Adjustments 8-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9 OPERATING RECOMMENDATIONS
Break-In 9-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
No-Load Operation 9-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exercise Period 9-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low Operating Temperatures 9-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Rating Factors 9-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ii
1. Introduction
GENERAL
Each operator should read this manual before oper-
ating the set for the first time. A generator set (gen-
set) must be operated and maintained properly if
you are to expect safe, reliable and quiet operation.
The manual includes a troubleshooting guide and a
maintenance schedule.
The engine manual is included with the set. Where
there is conflicting information, this manual takes
precedence over the engine manual.
There are two types of control panels available for
the generator set, the Detector control or the Senti-
nel control panel (Figure 1-1). The panels shown in-
clude optional features (indicators, meters and
switches) that may or may not be included with the
genset. All standard and optional controls and indi-
cators are discussed in Sections 3 and 5 of this
manual.
Detector 12 Control
There are separate Operation and Troubleshooting
sections for gensets using the Sentinel control or
the Detector control (Figure 1-1). Refer to the Table of
Contents for specific information relating to your
genset. The remaining sections apply to all versions.
WARNING
nance can lead to severe personal injury or loss
of life and property by fire, electrocution, me-
chanical breakdown or exhaust gas asphyxi-
ation. Read and follow the safety precautions
on page iii and carefully observe all instructions
and precautions in this manual.
Improper operation and mainte-
Sentinel Control
FIGURE 1-1. CONTROL PANEL CONFIGURATIONS
1-1
HOW TO OBTAIN SERVICE
When the generator set requires servicing, contact
your nearest Cummins
tor. Factory-trained Parts and Service representatives are ready to handle all your service needs.
®
/Onan® dealer or distribu-
1-800-888-ONAN (this automated service utilizes
touch-tone phones only). By entering your area
code and the first three digits of your local telephone
number, you will receive the name and telephone
number of the distributor nearest you.
If you are unable to locate a dealer or distributor,
consult the Yellow Pages. Typically, our distributors
are listed under:
For outside North America, call Onan Corporation,
1-612-574-5000, 7:30 AM to 4:00 PM, Central Stan-
dard Time, Monday through Friday. Or, send a fax to
Onan using the fax number 1-612-574-8087.
GENERATORS-ELECTRIC or
ELECTRICAL PRODUCTS
When contacting your distributor, always supply the
For the name of your local Cummins/Onan or Onan-
only distributor in the United States or Canada, call
complete Model, Specification, and Serial Number
as shown on the generator set nameplate.
WARNING
INCORRECT SERVICE OR PARTS REPLACEMENT CAN RESULT IN SEVERE PERSONAL IN-
JURY, DEATH, AND/OR EQUIPMENT DAMAGE. SERVICE PERSONNEL MUST BE QUALIFIED
TO PERFORM ELECTRICAL AND/OR MECHANICAL SERVICE.
Onan is a registered trademark of Onan Corporation.
Cummins is a registered trademark of Cummins Engine Company, Inc.
1-2
2. Specifications
MODEL GGHB GGHC GGHD
Engine
Onan Modified Ford V-8
Generator kW Rating
(See Genset Nameplate)
Fuel or a combination of two fuels Propane
Exhaust
Connection
Backpressure (Max. Allowed)
Electrical System
Starting Voltage
Battery Charging Alternator (Max.
Rating)
Cooling System
Capacity with Standard Radiator
Lubricating System
Oil Capacity with Filters
Tune-up Specifications
Spark Plug Gap
Battery
Required Battery Voltage
Group Number
LSG-875 LSG-875 LSG-875
Natural Gas
3 inch NPT
20.4 inch H
12 Volts DC
37 A
7.2 Gal (27.3 L) 7.7 Gal (29 L) 7.7 Gal (29 L)
9 Qts (8.6 L) 10 Qts (9.5 L) 10 Qts (9.5 L)
0.035
(0.89 mm)
12 Volts DC
31
Propane
Natural Gas
3 inch NPT
O
2
20.4 inch H
12 Volts DC
37 A
0.035
(0.89 mm)
12 Volts DC
31
O
2
Propane
Natural Gas
3 inch NPT
20.4 inch H
12 Volts DC
37 A
0.035
(0.89 mm)
12 Volts DC
31
O
2
2-1
2-2
3. Operation (Detector Control)
GENERAL
This section covers prestart checks, starting and
stopping and operating the generator set. Each op-
erator should read through this entire section before
attempting to start the set. It is essential that the op-
erator be completely familiar with the set for safe
operation. Refer to Section 9 for operating recom-
mendations.
PRESTART CHECKS
Before starting, be sure the following checks have
been made and the unit is ready for operation. Refer
to the Maintenance section for the recommended
procedures.
Lubrication
Check the engine oil level. Keep the oil level as
close as possible to the dipstick high mark without
overfilling.
Coolant
Check the engine coolant level. The cold coolant
level should be about 3/4 inch (18 mm) below the ra-
diator cap lower sealing surface. Do not check while
the engine is hot.
WARNING
severe burns. Do not bleed hot, pressurized coolant
from a closed cooling system.
Contact with hot coolant can result in
Fuel
Open all manual shutoff valves in the fuel supply
system.
Exhaust
Check to make sure entire exhaust system is tight,
that no combustible materials are near system, and
gases are discharged away from building openings.
CONTROL PANEL
The following describes the function and operation
of the Detector Control panel. All instruments and
control switches are located on the face of the con-
trol panel as illustrated in Figures 3-1 through 3-3.
The control panel is separated into a DC panel for
monitoring the engine and an AC panel for monitor-
ing the generator.
3-1
OIL PRESSURE
GAUGE
PANEL LAMP
RUN/STOP/REMOTE
SWITCH
COOLANT
TEMPERATURE
GAUGE
DC VOLTMETER
FIGURE 3-1. DC CONTROL PANEL (DETECTOR 12 SHOWN)
DC Panel
Panel Lamp: Illuminates control panel.
RESET/LAMP
TEST/ PANEL
LAMP SWITCH
INDICATOR
LAMPS
RUNNING
TIME METER
EMERGENCY STOP
PUSHBUTTON
Run/Stop/Remote Switch: Starts and stops the
set locally, or from a remote location wired to the
control engine monitor board.
Oil Pressure Gauge: Indicates pressure of lubri-
cating oil in engine (wired to a sensor located on the
engine). Normal oil pressure is 40 to 65 psi (276 to
449 kPa) at normal operating temperature.
Coolant Temperature Gauge: Indicates tempera-
ture of circulating coolant in engine (wired to a sen-
sor located on engine). Engine coolant temperature
is typically between 165
° to 195° F(74° to 91° C).
DC Voltmeter: Indicates the battery charging sys-
tem voltage. Normal charging voltage is 12 to 14
volts.
Running Time Meter: Registers the total number
of hours the unit has run. Use it to keep a record of
periodic servicing. Time is cumulative; meter can-
not be reset.
Reset/Lamp Test/Panel Lamp Switch: Resets
the fault circuit only when the Run/Stop/Remote
switch is in the Stop (Reset) position. Tests fault
lamps and turns on the control panel lamp.
Emergency Stop Button (Optional): Push-in
switch for emergency shutdown of the engine. To
reset, pull switch out and move Run/Stop/Remote
switch to Stop position. Then push test switch to Re-
set/Lamp Test position.
3-2
Indicator Lamps: The control panel has twelve indicator lamps which are described as follows:
• RUN (green) lamp comes on when starter cir-
cuit opens after set starting.
• PRE LO OIL PRES (yellow) indicates engine
oil pressure is marginally low.
• PRE HI ENG TEMP (yellow) indicates engine
temperature is marginally high.
• LO OIL PRES (red) indicates engine has shut
down because of critically low oil pressure.
• HI ENG TEMP (red) indicates engine has shut
down because of critically high engine tem-
perature.
• OVERSPEED (red) indicates engine has shut
down because of excessive speed.
• OVERCRANK (red) indicates engine has failed
to start during the cranking period.
• FAULT 1 (red) lamp indicates an undedicated
fault. May be field programmed as a shutdown
or non-shutdown, and as a timed or non-timed
fault. (Normally set for timed shutdown).
• FAULT 2 (red) lamp indicates same features as
Fault 1 (normally set for non-timed shutdown).
• LOW ENG TEMP (yellow) lamp lights if engine
temperature is marginally low for starting. It
may indicate an inoperative coolant heater.
• LO FUEL (yellow) (optional) indicates fuel sup-
ply pressure is marginally low (5 inches [127
mm] WC or less).
• SWITCH OFF (flashing red) indicates genera-
tor set is not in automatic start mode.
FIGURE 3-2. INDICATOR LAMPS
3-3
AC VOLTMETER
AC AMMETER
FREQUENCY/
RPM METER
UPPER AND LOWER
SCALE INDICATOR
A−C VOLTS
VOLTAGE
ADJUST
A−C AMPERES
EXCITATION
FIELD BREAKER
RPM
HERTZ
FIGURE 3-3. AC CONTROL PANEL
AC Panel
AC Voltmeter: Dual range instrument indicating
AC voltage. Measurement range in use shown on
indicator lamp.
AC Ammeter: Dual range instrument indicates AC
generator line current.
Frequency/RPM Meter: Indicates generator out-
put frequency in hertz and engine speed in revolu-
tions-per-minute (RPM).
Voltage Adjusting Rheostat: Provides approxi-
mately plus or minus five percent adjustment of the
rated output voltage.
PHASE
SELECTOR
SWITCH
Upper and Lower Scale Indicator Lamps: Indi-
cates which scale to use on the AC voltmeter and
ammeter.
Phase Selector Switch: Selects phases of gen-
erator output to be measured by AC voltmeter and
ammeter.
Field Breaker: Provides generator exciter and
regulator protection from overheating in the event of
certain failure modes of generator, exciter and volt-
age regulator.
3-4
GENERATOR AC VOLTAGE REGULATOR
The solid-state regulator controls AC output voltage
from the generator at a predetermined level regardless of load. Refer to the GG Series Specification
Sheet for the voltage regulation and random voltage variation specifications.
ENGINE CONTROL MODULE
Electronic and relay components of the engine
monitoring circuit are on a circuit board assembly.
Sensor inputs are connected by the wiring harness
to plug connectors on the board. The control mod-
ule provides the following functions of unit protec-
tion.
• Overcrank - The standard cycle cranking fea-
ture allows three 15-second cranking cycles
with two 15-second rest periods. If engine fails
to start, the module lights a fault lamp and
opens the cranking circuit.
The overcrank option limits engine cranking to
75 seconds. If engine fails to start, the module
lights a fault lamp and opens the cranking cir-
cuit.
• Overspeed - Shuts down the engine immedi-
ately if overspeed occurs and lights a fault
lamp.
For non-PMG generator sets, the sensor
switch is mounted in the end bell on the genera-
tor shaft. It is factory adjusted to shut down 60
hertz units at 2100
1850+
PMG generator sets, a frequency detection
module, located inside the control box, moni-
tors PMG frequency and shuts down 60 hertz
units at 2100
1850+
50 r/min.
50 r/min.
±90 r/min, 50 hertz units at
±90 r/min, 50 hertz units at
• Low Oil Pressure - Shuts down the engine im-
mediately and lights a fault lamp if oil pressure
drops below:
GGHB − 14 psi (97 kPA)
GGHC, GGHD − 25 psi (195 kPA)
The fault is time-delayed about 10 seconds following starter disconnect and inhibited during
cranking. The delay allows oil pressure to rise
to normal before the electronic control module
monitors this system.
A pre-low oil pressure sensor and lamp pro-
vides an alarm that oil pressure is marginally
low or less than:
GGHB − 20 psi (137 kPA)
GGHC, GGHD − 30 psi (207 kPA)
The cause should be found and corrected as
soon as possible.
• High Engine Temperature - shuts down the en-
gine immediately if coolant temperature rises
above 230° F (110° C) and lights a fault lamp.
The fault is time-delayed about 10 seconds fol-
lowing starter disconnect and inhibited during
cranking. This delay allows coolant in a hot en-
gine time to circulate and return the water
jacket to normal before the electronic control
module monitors this system.
A pre-high engine temperature sensor and
lamp provides an alarm that engine tempera-
ture is marginally high, 220° F (104° C)
cause should be found and corrected as soon
as possible.
CAUTION
shutdown system may not operate if the
coolant level is too low. The high engine
temperature sensor monitors coolant tem-
perature. Loss of coolant will prevent sen-
sor operation and allow the engine to over-
heat causing severe damage to the engine.
Therefore, maintain adequate coolant level
for proper operation of the high engine tem-
perature shutdown system.
The high engine temperature
. The
• Low Coolant Level Alarm/Shutdown (Optional)
- An electronic switch that provides engine
alarm or shutdown if coolant level falls too low.
It also turns on the fault lamp.
3-5
STARTING
The following sections cover the three systems
used to start the generator set.
Before starting the generator set, make sure that
exhaust and fuel fittings are tight and properly positioned and that proper maintenance has been per-
formed. See Prestart Checks in this section.
Starting at Control Panel
where the minimum ambient temperature is above
40
°F (4°C). NFPA also requires that the engine
coolant be maintained at a minimum of 90
and for most applications, accept the emergency
load in 10 seconds or less. Although most Onan
generator sets will start in temperatures below 40
°C) when equipped with coolant heaters, it might
(4
take some running time to warm the engine up be-
fore a load can be applied when ambient tempera-
tures are below 40
°F (4°C).
°F (32°C)
°F
Move the Run-Stop-Remote switch on the DC pan-
el to the RUN position. This will activate the engine
control system and the starting system. The starter
will begin cranking and after a few seconds the en-
gine should start. The starter will disconnect when
the engine reaches a speed of 450 to 570 RPM.
If the engine does not start, the starter will disen-
gage after a specified period of time and the control
will indicate an overcrank fault. Generator sets with
the optional overcrank control will crank continu-
ously for up to 75 seconds before disengaging the
starter. Generator sets with the standard cycle
cranking feature will crank for 15 seconds in each
cycle until 3 cycles have been completed. To clear
an overcrank fault, place the Run-Stop-Remote
switch in the STOP position and momentarily press
the Reset switch. Wait two minutes for the starter
motor to cool and then repeat the starting proce-
dure. If the engine does not run after a second at-
tempt at starting, refer to the Troubleshooting sec-
tion.
Starting From Remote Location
Move the Run/Stop/Remote switch on the genera-
tor set DC panel to the REMOTE position. This al-
lows the generator set to be started from a remote
switch. Closing the remote switch initiates the start-
ing sequence described in the previous section.
Automatic Starting
Place the Run/Stop/Remote switch on the genera-
tor set DC panel in the REMOTE position if an auto-
matic transfer switch is used. This allows the trans-
fer switch to start the generator set if a power outage
occurs and stop it when the power returns.
Cold Starting With Loads
In accordance with NFPA 110, Onan recommends
installing standby generator sets (life safety systems) equipped with coolant heaters in locations
The Low Engine Temperature (LET) lamp on the
Onan Detector 12 control is provided to meet the re-
quirements of NFPA 110. The LET sensor signals
an alarm when the engine coolant temperature falls
below 70
ent temperature falls below 40
may be lit even though the coolant heaters are con-
nected and operable. Under these conditions, al-
though the generator set may start, it may not be
able to accept load within 10 seconds. When this
condition occurs, check the coolant heaters for
proper operation. If the coolant heaters are operat-
ing properly, other precautions might be necessary
to warm the engine before applying a load.
°F (21°C). In applications where the ambi-
°F (4°C), the LET
STOPPING
Before Stopping
Run the generator set at no load for three to five
minutes before stopping. This allows the lubricating
oil and engine coolant to carry heat away from the
combustion chamber and bearings.
To Stop
If the set was started at the set control panel or at a
remote control panel, move the Run/Stop/Remote
switch or remote starting switch to the STOP posi-
tion. If the set was started by an automatic transfer
switch, the transfer switch will send a remote (timed
delay) stop signal after the normal power source re-
turns.
Emergency Stop
An optional emergency stop button is located on the
right side of control panel (Figure 3-1). Push button
in for emergency stop. To reset, pull switch out and
move Run/Stop/Remote switch to Stop position.
Then push test switch to Reset/Lamp Test position.
Onan automatic transfer switches have as an op-
tion an exerciser that can be preset to provide regu-
lar exercise periods. Typically the exerciser can be
set for time of start, length of run, and day of week.
3-6
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