.

Generator Set

Natural Gas - 10.0 kW, 12.5 kVA, Standby

9.0 kW, 10.0 kVA, Prime
Propane - 11.5 kW, 14.4 kVA, Standby
10.4 kW, 11.6 kVA, Prime
Optional Features Shown
GNAB 60 Hz Generator Set

Description Features
® ®
The Cummins Onan GN series spark ignited generator • Low Exhaust Emissions - Meets US EPA Phase 1
set is a fully integrated power generation system, and 1995 - 1999 California emissions regulations for
providing optimum performance, reliability, and versatility ULGE engines.
for standby or prime power operation, in stationary
• Onan Heavy-Duty Engine - Rugged 4-cycle liquid-
applications.
cooled industrial spark-ignited engine delivers reliable
A primary feature of the GN GenSet is strong motor power. The electronic governor provides fast response
starting capability and fast recovery from transient load to load changes.
changes. The GN torque matched system includes a
• Electronic Voltage Regulator - Torque-matched
heavy-duty Onan 4-cycle liquid cooled spark ignited
regulator provides fast recovery from transient load
engine, an AC alternator with high motor starting
changes, underfrequency compensation, and precise
capacity, and an electronic voltage regulator for precise
regulation.
regulation under steady-state or transient loads. The GN
GenSet accepts 100% of the nameplate standby rating in • Alternator - Excellent motor starting capability with low
one step, in compliance with NFPA110 requirements. reactance 2/3 pitch windings, low waveform distortion
An LP vapor fuel system is standard with an option for with non-linear loads and fault clearing short-circuit
natural gas. capability.

The GN GenSet offers both user and environment- • Control Systems - The standard control provides
friendly operation. The standard generator set control manual starting, operation, and fault protection features.
provides for manual starting, operation, and automatic Upgrade to two wire automatic remote operation or to
TM
shutdown at fault detection. Optional AC meters are the Detector Control for NFPA110 compliance.
available. The control may be upgraded to automatic • Cooling Systems - Standard cooling package provides
TM o
remote operation or to the Detector Control for reliable running up to 40 C ambient temperature.
NFPA110 compliance.
• Integral Vibration Isolation - Robust skid base
A wide range of options, accessories, and services are supports the engine, alternator, and radiator on
available, allowing configuration to your specific power isolators, minimizing transmitted vibration.
generation needs.
• Housings - Optional weather proof and sound
Every production unit is factory tested at rated load and attenuated enclosures are available.
power factor. This testing includes demonstrated
capacity at rated power, single-step rated load pickup, • Certifications - Generator sets are designed,
and reactive current capability to inductive loads. manufactured, tested, and certified to relevant UL,
Cummins Onan manufacturing facilities are committed to NFPA, ISO, IEC, and CSA standards.
the highest possible quality in the design, manufacture, • Warranty and Service - Backed by a comprehensive
and support of our products. GN GenSets are CSA warranty and worldwide distributor service.
certified.
All Cummins Onan brand power generation systems are
backed by a comprehensive warranty program and
supported by a worldwide network of 170 distributors and
service branches, to assist you with warranty, service,
parts, and planned maintenance support.

© 2000 Onan Corporation Specifications subject to change without notice S-1184

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Generator Set
The general specifications in this document provide representative configuration details, but the outline
drawing must be used for installation design.
See outline drawing 500-3275 for installation design specifications.
Unit Width, in.(mm) 28.0 (711)
Unit Height, in.(mm) 38.8 (986)
Unit Length, in.(mm) 58.3 (1481)
Unit Dry Weight, lbs. (kgs) 730 (331)
Unit Wet Weight, lbs. (kgs) 755 (342)
Rated Speed, rpm 1800
Voltage Regulation, No Load to Full Load ±2.0%
Random Voltage Variation ±1.0%
Frequency Regulation 5%
Random Frequency Variation ±0.5%
Radio Frequency Interference Meets requirements of most industrial and commerical applications
Natural Gas Propane
Cooling Standby Prime Standby Prime
Fan Load, HP (kW) 0.8 (0.6) 0.8 (0.6) 0.8 (0.6) 0.8 (0.6)
Coolant Capacity with radiator, US Gal (L) 1.9 (7.1) 1.9 (7) 1.9 (7) 1.9 (7)
Coolant Flow Rate, Gal/min (L/min) 14.5 (55.0) 14.5 (55) 14.5 (55) 14.5 (55)
Heat Rejection To Coolant, Btu/min (MJ/min) 634.0 (0.7) TBD 850 (0.9) TBD
Heat Radiated To Room, Btu/min (MJ/min) 131.0 (0.1) TBD 155 (0.2) TBD
Maximum Coolant Friction Head, psi (kPa) 1.4 (9.7) 1.4 (10) 1 (10) 1 (10)
Maximum Coolant Static Head, psi (kPa) 12.0 (3.7) 12.0 (3.7) 12 (3.7) 12 (3.7)
Air
3
Combustion Air, cfm (m /min) 34.6 (1.0) TBD 35.8 (1.0) TBD
3
Alternator Cooling Air, cfm (m /min) 225.0 (6.4) 225.0 (6.4) 225.0 (6.4) 225.0 (6.4)
3
Radiator Cooling Air, scfm (m /min) 3032.0 (85.8) 3032.0 (85.8) 3032.0 (85.8) 3032.0 (85.8)
2 2
Minimum Air Opening to Room, ft (m ) 2.8 (0.3) 2.8 (0.3) 2.8 (0.3) 2.8 (0.3)
2 2
Minimum Discharge Opening, ft (m ) 1.9 (0.2) 1.9 (0.2) 1.9 (0.2) 1.9 (0.2)
Max. Static Restriction, in H2O (Pa) 0.2 (62.5) 0.2 (62.5) 0.2 (62.5) 0.2 (62.5)
Rating Definitions
Standby Rating based on: Applicable for supplying emergency power for the duration of normal power interruption. No
sustained overload capability is available for this rating. (Equivalent to Fuel Stop Power in accordance with ISO3046, AS2789,
DIN6271 and BS5514). Nominally rated.
Prime (Unlimited Running Time) Rating based on: Applicable for supplying power in lieu of commercially purchased
power. Prime power is the maximum power available at a variable load for an unlimited number of hours. A 10% overload
capability is available for limited time. (Equivalent to Prime Power in accordance with ISO8528 and Overload Power in
accordance with ISO3046, AS2789, DIN6271, and BS5514). This rating is not applicable to all generator set models.
Base Load (Continuous) Rating based on: Applicable for supplying power continuously to a constant load up to the full
output rating for unlimited hours. No sustained overload capability is available for this rating. Consult authorized distributor for
rating. (Equivalent to Continuous Power in accordance with ISO8528, ISO3046, AS2789, DIN6271, and BS5514). This rating
is not applicable to all generator set models.
Site Derating Factors
Natural Gas
Engine power available up to 1000 ft (300 m) at ambient temperatures up to 85°F (30°C). Above 1000 ft (300 m) derate at
3.5% per 1000 ft (305 m), and 2% per 10°F (4% per 11°C) above 85°F (30°C).
Propane
Engine power available up to 1000 ft (300 m) at ambient temperatures up to 85°F (30°C). Above 1000 ft (300 m) derate at
3.5% per 1000 ft (305 m), and 2% per 10°F (4% per 11°C) above 85°F (30°C).

© 2000 Onan Corporation Specifications subject to change without notice S-1184

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Engine
Onan heavy duty spark ignited engine provides stable power, reliable quiet operation, low fuel consumption, and
fast response to sudden load changes. Fuel system options available for natural gas, LP vapor, and LP liquid.
Standard electronic governing provides precise speed regulation especially useful for applications requiring
constant (isochronous) frequency regulation such as Uninterruptible Power Supply systems, non-linear loads, or
sensitive electronic loads. Optional coolant heaters are recommended for all emergency standby installation or
any application requiring fast load acceptance after start-up.
Specifications – Engine
Base Engine LPG-3, naturally aspirated
3
Displacement in (L) 85.1 (1.4)
Overspeed Limit, rpm 2100 ±50
Regenerative Power, kW 4.40
Cylinder Block Configuration Cast iron, In-line 3 cylinder
Cranking Current 160 amps at ambient temperature of 32°F(0°C)
Battery Charging Alternator 45 amps
Starting Voltage 12-volt, negative ground
Lube Oil Filter Types Spin-on, full flow
o o
Standard Cooling System 104 F (40 C) ambient radiator cooling system
Standard Fuel LP vapor is standard
Natural Gas Propane
Power Output Standby Prime Standby Prime
Gross Engine Power Output, bhp (kWm) 17.0 (12.7) 15.5 (11.6) 19.7 (14.7) 17.8 (13.3)
BMEP, psi (kPa) 87.7 (604.7) 79.5 (548.1) 102.0 (703.3) 91.9 (633.6)
Bore, in. (mm) 3.38 (85.9) 3.38 (85.9) 3.38 (85.9) 3.38 (85.9)
Stroke, in. (mm) 3.15 (80.0) 3.15 (80.0) 3.15 (80.0) 3.15 (80.0)
Piston Speed, ft/min (m/s) 945.0 (4.8) 945.0 (4.8) 945.0 (4.8) 945.0 (4.8)
Compression Ratio 9.5:1 9.5:1 9.5:1 9.5:1
Lube Oil Capacity, qt. (L) 4.8 (4.5) 4.8 (4.5) 4.8 (4.5) 4.8 (4.5)
Fuel Flow
Minimum Operating Pressure, in. H2O (kPa) 5.5 (1.4) 5.5 (1.4) 6 (1) 6 (1)
Maximum Operating Pressure, in. H2O (kPa) 13.6 (3.4) 13.6 (3.4) 14 (3) 14 (3)
Air Cleaner
Maximum Air Cleaner Restriction, in. H2O (kPa) 10.0 (2.5) 10.0 (2.5) 10.0 (2.5) 10.0 (2.5)
Exhaust
3
Gas Flow (Full Load), cfm (m /min) 80.0 (2.3) TBD 83.6 (2.4) TBD
o o
Gas Temperature, F ( C) 1000 (538) TBD 1100 (593) TBD
Maximum Back Pressure, in. H2O (kPa) 15.0 (3.7) 15.0 (3.7) 15.0 (3.7) 15.0 (3.7)
Fuel Consumption - Natural Gas Standby Prime
60 Hz Ratings, kW (kVA) 10.0 (12.5) 9.0 (10.0)
Load 1/4 1/2 3/4 Full 1/4 1/2 3/4 Full
cfh 72.0 94.7 120.0 144.0 TBD TBD TBD 134.3
m3/hr 272.5 358.4 454.2 545.0 TBD TBD TBD 508.3

Fuel Consumption - Propane Standby Prime

60 Hz Ratings, kW (kVA) 11.5 (14.4) 10.4 (11.6)
Load 1/4 1/2 3/4 Full 1/4 1/2 3/4 Full
cfh 33.5 45.3 57.6 69.9 TBD TBD TBD 65.2
m3/hr 0.9 1.3 1.6 2.0 TBD TBD TBD 1.8

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Alternator
Single-bearing alternators couple directly to the engine flywheel with flexible discs for drivetrain reliability and
durability. No gear reducers or speed changers are used. Two-thirds pitch windings eliminate third-order
harmonic content of the AC voltage waveform and provide the standardization desired for paralleling of
generator sets. The excitation system is a self (shunt) excited system with the voltage regulator powered
o
directly from the generator set output. The standard alternator is a single phase 4 lead, 105 C rise. Optional
alternators include 3 phase and 3 phase with full single phase output capability.

Alternator Application Notes

Alternator Space Heater - is recommended to inhibit condensation.

Available Output Voltages

[] 120/208 [] 110/220 [] 347/600

[] 120/240 [] 120/240
[] 127/220
[] 220/380
[] 277/480
[] 139/240
[] 240/416
[] 255/440

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Specifications – Alternator

Design Revolving field, single bearing, 4-pole, brushless, drip-proof construction.

Stator Skewed stator and 2/3 pitch windings minimize field heating and voltage
harmonics.
Rotor Dynamically balanced assembly. Direct coupled to engine by a flexible drive disc.
Complete amortisseur (damper) windings help minimize voltage deviations and
heating effects under unbalanced loads. The rotor is supported by a pre-lubricated
maintenance-free ball bearing.
Insulation System Class F per NEMA MG1-1.65 and BS2757
o
Standard Temperature Rise At rated load is less than 105 C at standby rating, per NEMA MG1.22.40, IEEE
115 and IEC 34-1.
Exciter Type The excitation system derives its power from the main output of the generator,
eliminating the need for a separate excitation power source.
Phase Rotation A (U), B (V), C (W)
Alternator Cooling Direct drive centrifugal blower
AC Waveform Total Harmonic Distortion Less than 7% total no load to full linear load, and less than 3% for any single
harmonic
Telephone Influence Factor (TIF) Less than 40 per NEMA MG1-22.43.
Telephone Harmonic Factor (THF) Less than 3
Natural Gas
1 o o o
Three Phase Table 105 C 105 C 105 C
Feature Code B268 B256 B304
Alternator Data Sheet N/A N/A N/A
Number
Voltage Ranges 120/208 120/208 347/600
Thru Thru
139/240 139/240
240/416 240/416
Thru Thru
277/480 277/480
Surge kW 12 12 12
Motor Starting kVA (at Shunt 47 35 35
90% sustained voltage)
Full Load Current - 120/208 127/220 139/240 220/380 240/415 254/440 277/480 347/600
Amps at Standby 35 33 30 19 17 16 15 12
Rating
Notes:
1. Single phase power can be taken from a three phase generator set at up to 2/3 set rated 3-phase kW at 1.0 power factor. Also
see Note 2 below.
Natural Gas
o o o
Single Phase Table 105 C 105 C 105 C
Feature Code B274 B256 B268
Alternator Data Sheet N/A N/A N/A
Number
Voltage Ranges 120/240 120/240 120/240
Surge kW 12 12 12
Motor Starting kVA (at Shunt 21 21 27
90% sustained voltage)
1 2 1 1
Full Load Current - 110/220 110/220 120/240 120/240
30 48 28 42
Amps at Standby
Rating
Notes:
1. The broad range alternators can supply single phase output up to 2/3 set rated 3-phase kW at 1.0 power factor.
2. The extended stack (full single phase output) and 4 lead alternators can supply single phase output at full set rated kW at 1.0
power factor.

© 2000 Onan Corporation Specifications subject to change without notice S-1184

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Propane
1 o o o
Three Phase Table 105 C 105 C 105 C
Feature Code B256 B268 B304
Alternator Data Sheet N/A N/A N/A
Number
Voltage Ranges 120/208 120/208 347/600
Thru Thru
139/240 139/240
240/416 240/416
Thru Thru
277/480 277/480
Surge kW 13.1 13.1 13.1
Motor Starting kVA (at Shunt 35 47 35
90% sustained voltage)
Full Load Current - 120/208 127/220 139/240 220/380 240/415 254/440 277/480 347/600
40 38 34 22 20 19 17 14
Amps at Standby
Rating
Notes:
1. Single phase power can be taken from a three phase generator set at up to 2/3 set rated 3-phase kW at 1.0 power factor. Also
see Note 2 below.
Propane
o o o
Single Phase Table 105 C 105 C 105 C
Feature Code B274 B256 B268
Alternator Data Sheet N/A N/A N/A
Number
Voltage Ranges 120/240 120/240 120/240
Surge kW 13.1 13.1 13.1
Motor Starting kVA (at Shunt 21 21 27
90% sustained voltage)
Full Load Current - 110/2201 110/2202 120/2401 120/2402
35 52 32 48
Amps at Standby
Rating

Notes:
1. The broad range alternators can supply single phase output up to 2/3 set rated 3-phase kW at 1.0 power factor.
2. The extended stack (full single phase output) and 4 lead alternators can supply single phase output at full set rated kW at 1.0
power factor.

© 2000 Onan Corporation Specifications subject to change without notice S-1184

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Control System
Standard Manual Control System
• Manual starting
• Controls generator set starting and shutdown
• Control components designed to withstand the vibration levels typical in generator sets
Standard Control Description
• Manual starting, 12 volt • Basic shutdowns
Standard Features Optional Features
• High temperature shutdown • AC meter package
• Low oil pressure shutdown • Oil pressure gauge (engine mounted)
Optional Features Shown • Running time meter (engine mounted)
• Water temperature gauge (engine mounted)

Optional Detector Control System

• Automatic remote starting
• Control components designed to withstand the vibration levels typical in generator sets
• Controls generator set starting and shutdown
Standard Detector 12 Light (NFPA110) Control Description
• 12 light engine monitor (NFPA110 level) • Lamp test switch
• Common alarm contact • Oil pressure gauge
• Coolant temperature gauge • Remote starting, 12 volt, 2 wire
• Cycle cranking control • Reset switch
• DC voltmeter • Run-Off-Auto switch
• Field circuit breaker • Running time meter
• Individual 1/2 A relay signals
Optional Features Shown
Standard Features Optional Features
• 5% voltage adjust rheostat • Overcrank shutdown (red light) • Audible alarm
• AC ammeter (dual scale) • Overspeed shutdown (red light) • Emergency stop
• AC voltmeter (dual scale) • Pre-alarm high coolant temp (yellow light) • Low battery voltage warning
• Dual scale frequency/tachometer • Pre-alarm low oil pressure (yellow light) • Low coolant level warning or shutdown
• Engine gauges • Run indicator (green light) • Remote fault signal package
• High coolant temperature shutdown (red • Two customer selected faults (red light) • Speed adjust rheostat
light) • Voltmeter/Ammeter phase selector • Time delay start/stop
• Low coolant temperature (yellow light)
• Low oil pressure shutdown (red light)

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Generator Set Options
Engine Control Panel Generator Set
[ ] 120/240 V coolant heater [ ] 120/240 V, 100 W control anti- [ ] Circuit breakers
[ ] Heavy duty air cleaner condensation heater [ ] Quiet Site Stage II Housing
[ ] Oil pressure gauge [ ] AC meters (for manual and remote w/silencer
[ ] Water temperature gauge control) [ ] Weather protective enclosure
[ ] Auxiliary relay contacts (Detector w/exhaust silencer
Fuel System control only) [ ] 2 year prime power warranty
[ ] Natural gas [ ] Detector 12 control w/AC meters [ ] 2 year standby warranty
(meets NFPA 110 code requirements) [ ] 5 year basic warranty
Alternator [ ] Remote - ATS: Automatic transfer [ ] 5 year comprehensive warranty
[ ] 120/240 V, 100 W anti-condensation switch compatible 2-wire control with
heater low oil pressure and high coolant
[ ] Broad range 12-lead extended stack temperature shut downs
with full single phase output
capability Exhaust System
[ ] Critical grade exhaust silencer

Accessories and Services

A wide range of products and services is available to match your power generation system requirements.
Cummins Onan products and services include:
• Diesel and Spark-Ignited Generator Sets
• Transfer Switches
• Bypass Switches
• Parallel Load Transfer Equipment
• Digital Paralleling Switchgear
• PowerCommand Network and Software
• Distributor Application Support
• Planned Maintenance Agreements

© 2000 Onan Corporation Specifications subject to change without notice S-1184

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Warranty
All components and subsystems are covered by an express limited one-year warranty. Other optional and
extended factory warranties and local distributor maintenance agreements are available.
Other available warranties include: 2-year prime power, 2-year standby, 5-year basic power, 5-year
comprehensive power and 10-year major component. The 2-year prime power and the 10-year major
component warranties are available in North America only.

Certifications
CSA - This generator set is CSA certified to product class 4215-01.
NFPA Testing - The Prototype Test Support program verifies the performance integrity of the generator
set design. Cummins Onan products bearing the PTS symbol meet the prototype test requirements of
NFPA 110 for Level 1 systems. A complete representative prototype generator set has been subjected
to a number of demanding tests to verify the design integrity and performance under both normal and
abnormal operating conditions per the requirements of NFPA 110 for Level 1 systems. Tests include
short circuit, endurance, temperature rise, torsional vibration, and transient response, including full load
pickup in one step.

See your distributor for more information

Onan Corporation
1400 73rd Avenue N.E.
Minneapolis, MN 55432
612.574.5000
Fax: 612.574.5298
Onan and PowerCommand are registered trademarks of Onan Corporation.
Cummins is a registered trademark of Cummins Engine Company.
Detector and AmpSentry are trademarks of Onan Corporation.
Windows is a registered trademark of Microsoft.

Important: Backfeed to a utility system can cause electrocution and/or property damage. Do not connect to any building's
electrical system except through an approved device or after building main switch is open.

© 2000 Onan Corporation Specifications subject to change without notice S-1184