mited warranty covers all systems and components.
Two-, five-, and ten-year extended warranties are also available.
D Alternator features:
d The Fast-Responset III wound field (WF) design alternator
provides excellent voltage response and short-circuit capability
using an auxiliary power brushless exciter.
d The unique Fast-Responset II excitation system delivers
excellent voltage response and short circuit capability using a
permanent magnet (PM)-excited alternator.
d The brushless, rotating-field alternator has broadrange
reconnectability.
D Other features:
d Controllers are available for all applications. See controller
features inside.
d The electronic, isochronous governor incorporates an
integrated drive-by-wire throttle body actuator delivering
precise frequency regulation.
RATINGS: All three-phase units are rated at 0.8 power factor. All single-phase units are rated at 1.0 power factor. Standby Ratings: Standby ratings apply to installations served by a reliable utility source.
The standby rating is applicable to varying loads for the duration of a power outage. There is no overload capability for this rating. Ratings are in accordance with ISO-3046/1, BS 5514, AS 2789, and DIN 6271.
Prime Power Ratings: Prime power ratings apply to installations where utility power is unavailable or unreliable. At varying load, the number of generator set operating hours is unlimited. A 10% overload
capacity is available for one hour in twelve. Ratings are in accordance with ISO-8528/1, overload power in accordance with ISO-3046/1, BS 5514, AS 2789, and DIN 6271. For limited running time and base
load ratings, consult the factory. Obtain the technical information bulletin (TIB-101) on ratings guidelines for the complete ratings definitions. The generator set manufacturer reserves the right to change the
design or specifications without notice and without any obligation or liability whatsoever. GENERAL GUIDELINES FOR DERATION: Altitude: Derate 0.5% per 100 m (328 ft.) elevation above 1500 m (4921 ft.)
up to a maximum elevation of 3000 m (9842 ft.). Temperature: Derate 2.0% per 10
_C (18_F) temperature above 25_C (77_F) up to 50_C (122_F).
Ratings Range
60 Hz
50 Hz
Standby:
kW
95--130
84--104
kVA
95--163
84--130
Prime:
kW
90--115
77--96
kVA
90--144
77--120
Model:
125
RES
G4-117 (125RES) 7/06
Generator Set Ratings
Natural Gas
LP Gas
130
_C Rise
105
_C Rise
130
_C Rise
105
_C Rise
Standby Rating
Prime Rating
Standby Rating
Prime Rating
Alternator
Voltage
Ph
Hz
kW/kVA
Amps
kW/kVA
Amps
kW/kVA
Amps
kW/kVA
Amps
120/208
3
60
125/156
434
115/144
399
105/131
364
96/120
333
127/220
3
60
125/156
410
115/144
377
105/131
344
96/120
315
120/240
3
60
125/156
376
115/144
346
105/131
316
96/120
289
120/240
1
60
95/95
396
90/90
375
95/95
396
86/86
358
139/240
3
60
125/156
376
115/144
346
105/131
316
96/120
289
220/380
3
60
120/150
228
110/138
209
105/131
199
96/120
182
277/480
3
60
125/156
188
115/144
173
105/131
158
96/120
144
4S11W/
347/600
3
60
125/156
150
115/144
138
105/131
126
96/120
115
4S11W/
4S11
110/190
3
50
104/130
395
96/120
365
96/120
365
88/110
334
4S11
115/200
3
50
104/130
375
96/120
346
96/120
346
88/110
318
S
120/208
3
50
104/130
361
96/120
333
96/120
333
88/110
305
110/220
3
50
104/130
341
96/120
315
96/120
315
88/110
289
110/220
1
50
84/84
382
77/77
350
84/84
382
77/77
350
220/380
3
50
104/130
198
96/120
182
96/120
182
88/110
167
230/400
3
50
104/130
188
96/120
173
96/120
173
88/110
159
240/416
3
50
104/130
180
96/120
167
96/120
167
88/110
153
120/208
3
60
130/163
451
115/144
399
110/138
382
100/125
347
127/220
3
60
130/163
426
115/144
377
110/138
361
100/125
328
120/240
3
60
130/163
391
115/144
346
110/138
331
100/125
301
120/240
1
60
100/100
417
91/91
379
100/100
417
91/91
379
139/240
3
60
130/163
391
115/144
346
110/138
331
100/125
301
220/380
3
60
125/156
237
115/144
218
110/138
209
100/125
190
277/480
3
60
130/163
195
115/144
173
110/138
165
100/125
150
4S13W/
347/600
3
60
130/163
156
115/144
138
110/138
132
100/125
120
4S13W/
4S13
110/190
3
50
104/130
395
96/120
365
96/120
365
88/110
334
4S13
115/200
3
50
104/130
375
96/120
346
96/120
346
88/110
318
S 3
120/208
3
50
104/130
361
96/120
333
96/120
333
88/110
305
110/220
3
50
104/130
341
96/120
315
96/120
315
88/110
289
110/220
1
50
90/90
409
80/80
364
90/90
409
80/80
364
220/380
3
50
104/130
198
96/120
182
96/120
182
88/110
167
230/400
3
50
104/130
188
96/120
173
96/120
173
88/110
159
240/416
3
50
104/130
180
96/120
167
96/120
167
88/110
153
4V11W/
120/240
1
60
110/110
458
105/105
438
100/100
417
91/91
379
4V11W/
4V11
110/220
1
50
96/96
436
87/87
395
88/88
400
80/80
364 G4-117 (125RES) 7/06
Alternator Specifications
Specifications
Alternator
Manufacturer
Kohler
Type
4-Pole, Rotating-Field
Exciter type
Wound field (WF)
Wound Exciter Field
with Separate Excitation
Power Winding
Permanent magnet (PM)
Brushless, Permanent-
Magnet
Leads: quantity, type
4S11W/4S11, 4S13W/4S13
12, Reconnectable
4V11W/4V11
4, 110--120/220--240
Voltage regulator
Solid State, Volts/Hz
Insulation:
NEMA MG1
Material
Class H
Temperature rise
130
_C, Standby
Bearing: quantity, type
1, Sealed
Coupling
Flexible Disc
Amortisseur windings
Full
Voltage regulation, no-load to full-load
Wound field (WF) alternator
�0.25% Average
Permanent magnet (PM) alternator
�2% Average
550 controller (with 0.5% drift
due to temperature variation)
3-Phase Sensing,
�0.25%
Unbalanced load capability
100% of Rated Standby
Current
One-step load acceptance
100% of Rating
Specifications
Alternator
Peak motor starting kVA:
(35% dip for voltages below)
480 V, 380 V 4S11W/4S11 (12 lead)
460 (60Hz), 350 (50Hz)
480 V, 380 V 4S13W/4S13 (12 lead)
515 (60Hz), 370 (50Hz)
240 V, 220 V 4V11W/4V11 (4 lead)
350 (60Hz), 285 (50Hz)
D NEMA MG1, IEEE, and ANSI standards compliance for
temperature rise and motor starting.
D Sustained short-circuit current of up to 300% of the rated
current for up to 10 seconds.
D Sustained short-circuit current enabling downstream circuit
breakers to trip without collapsing the alternator field.
D Self-ventilated and dripproof construction.
D Vacuum-impregnated windings with fungus-resistant epoxy
varnish for dependability and long life.
D Superior voltage waveform from a two-thirds pitch stator and
skewed rotor.
D Fast-Responset III wound field (WF) brushless alternator
with auxiliary power brushless exciter for excellent load
response.
D Fast-Responset II brushless alternator with brushless
exciter for excellent load response.
Application Data
Engine
Engine Specifications
60 Hz
50 Hz
Manufacturer
General Motors
Engine: model, type
Industrial Powertrain,
Vortec 8.1 L, 4-Cycle,
Turbocharged
Cylinder arrangement
V-8
Displacement, L (cu. in.)
8.1 (496)
Bore and stroke, mm (in.)
108 x 111 (4.25 x 4.37)
Compression ratio
9.1:1
Piston speed, m/min. (ft./min.)
399 (1311)
332 (1092)
Main bearings: quantity, type
Alum. Lead Silicon Alloy
Rated rpm
1800
1500
Max. power at rated rpm, kW (HP)
146 (195)
118 (158)
Cylinder head material
Cast Iron
Piston type and material
Strutless Flat Top,
Hypereutectic Cast Alum.
Crankshaft material
Cast Nodular Undercut
Rolled Fillet
Valve (exhaust) material
Int.-A193 Exh. Inconel
Governor type
Electronic
Frequency regulation, no-load to full-load
Isochronous
Frequency regulation, steady state
�0.5%
Frequency
Field-Convertible
Air cleaner type, all models
Dry
Exhaust
Exhaust System
60 Hz
50 Hz
Exhaust manifold type
Dry
Exhaust flow at rated kW, m
3
/min. (cfm)
26.1 (920)
18.7 (660)
Exhaust temperature at rated kW, dry
exhaust,
_C (_F)
649 (1200)
Maximum allowable back pressure,
kPa (in. Hg)
10.2 (3.0)
Exhaust outlet size at engine hookup,
mm (in.)
71 (2.8)
Engine Electrical
Engine Electrical System
60 Hz
50 Hz
Ignition system
Individual Coil
Near Plug Ignition
Battery charging alternator:
Ground (negative/positive)
Negative
Volts (DC)
12
Ampere rating
70
Starter motor rated voltage (DC)
12
Battery, recommended cold cranking
amps (CCA):
Qty., rating for --18
_C (0�F)
One, 630
Battery voltage (DC)
12
Fuel
Fuel System
60 Hz
50 Hz
Fuel type
LP Gas or
Natural Gas
Fuel supply line inlet
1.5 NPTF
Natural gas/LPG fuel supply pressure,
measured at the generator set fuel inlet
downstream of any fuel system
equipment accessories, kPa (in. H
2
O)
1.74--2.74 (7.0--11.0)
Fuel Composition Limits *
Nat. Gas
LP Gas
Methane, % by volume
90 min. Ethane, % by volume
4.0 max. Propane, % by volume
1.0 max.
85 min.
Propene, % by volume
0.1 max.
5.0 max.
C
4
and higher, % by volume
0.3 max.
2.5 max.
Sulfur, ppm mass
25 max.
Lower heating value,
kJ/m
3
(Btu/ft
3
), min.
26.6 (890)
67.5 (2260)
* Fuels with other compositions may be acceptable. If your fuel is
outside the listed specifications, contact your local distributor for
further analysis and advice. G4-117 (125RES) 7/06
Application Data
Lubrication
Lubricating System
60 Hz
50 Hz
Type
Full Pressure
Oil pan capacity, L (qt.)
8.0 (8.5)
Oil pan capacity with filter, L (qt.)
8.5 (9.0)
Oil filter: quantity, type
1, Cartridge
Cooling
Radiator System
Ambient temperature,
_C (_F)
45 (113)
Engine jacket water capacity, L (gal.)
10.0 (2.6)
Radiator system capacity, including
engine, L (gal.)
24.2 (6.4)
Engine jacket water flow, Lpm (gpm)
125 (33)
102 (27)
Heat rejected to cooling water at rated
kW, dry exhaust, kW (Btu/min.)
110 (6260)
72 (4100)
Heat rejected to engine oil at rated kW,
kW (Btu/min.)
1.4 (81)
1.2 (68)
Water pump type
Centrifugal
Fan diameter, including blades, mm (in.)
599 (23.6)
Fan, kWm (HP)
10.4 (14.0)
6.0 (8.1)
Max. restriction of cooling air, intake and
discharge side of radiator, kPa (in. H
2
O)
0.125 (0.5)
Operation Requirements
Air Requirements
60 Hz
50 Hz
Radiator-cooled cooling air,
m
3
/min. (scfm)
[
306 (10800)
232 (8200)
Combustion air, m
3
/min. (cfm)
8.8 (312)
6.2 (220)
Heat rejected to ambient air:
Engine, kW (Btu/min.)
72.0 (4100)
44.1 (2510)
Alternator,