Cummins S 1236
Cummins S 1236
Cummins S 1236
Model DKAF 60 Hz
EPA Emissions
25 kW, 31 kVA Standby
23 kW, 29 kVA Prime
Description
Features
Kubota Heavy-Duty Engine - Rugged 4-cycle, liquidcooled, industrial diesel engine delivers reliable power, low
emissions, and fast response to load changes.
Fuel Tanks - Dual wall sub-base fuel tanks and in-skid day
tanks are also offered.
S-1236p (6/06)
Generator Set
The general specifications provide representative configuration details. Consult the outline drawing for installation design.
Specifications General
See outline drawing 500-4224 for installation design specifications.
Unit Width, in (mm)
Unit Height, in (mm)
Unit Length, in (mm)
Unit Dry Weight, lb (kg)
Unit Wet Weight, lb (kg)
Rated Speed, rpm
Voltage Regulation, No Load to Full Load
Random Voltage Variation
Frequency Regulation
Random Frequency Variation
Radio Frequency Interference
31.0 (787)
38.6 (980)
66.9 (1699)
1314 (596)
1371 (622)
1800
2.0%
1.0%
5%
0.5% (Isochronous optional + 0.25%
Meets requirements of most industrial and commercial applications
Cooling
Fan Load, HP (kW)
Coolant Capacity with radiator, US Gal (L)
Coolant Flow Rate, Gal/min (L/min)
Heat Rejection To Coolant, Btu/min (MJ/min)
Heat Radiated To Room, Btu/min (MJ/min)
Maximum Coolant Friction Head, psi (kPa)
Maximum Coolant Static Head, ft (m)
Standby
3.4 (2.5)
3.1 (11.7)
13.0 (49.2)
2055.0 (2.2)
420.0 (0.4)
3.1 (21.4)
29.5 (9.0)
Prime
3.4 (2.5)
3.1 (11.7)
13.0 (49.2)
1781.0 (1.9)
370.0 (0.4)
3.1 (21.4)
29.5 (9.0)
Air
Combustion Air, scfm (m3/min)
Alternator Cooling Air, scfm (m3/min)
Radiator Cooling Air, scfm (m3/min)
Max. Static Restriction, in H2O (Pa)
74.2 (2.1)
250.0 (7.1)
3500.0 (99.0)
0.50 (124.50)
74.2 (2.1)
250.0 (7.1)
3500.0 (99.0)
0.50 (124.50)
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.
S-1236p (6/06)
Engine
Kubota heavy-duty diesel engines provide stable power, low fuel consumption, quiet operation, and fast response to sudden
load changes.
Mechanical governing is standard. Electronic governing is available for applications requiring constant (isochronous)
frequency regulation such as Uninterruptible Power Supply (UPS) systems, non-linear loads, or sensitive electronic loads.
Optional coolant heaters are recommended for all emergency standby installations or for any application requiring fast load
acceptance after start-up.
Specifications Engine
Base Engine
3
Displacement in (L)
Overspeed Limit, rpm
Regenerative Power, kW
Cylinder Block Configuration
Battery Capacity
Battery Charging Alternator
Starting Voltage
Lube Oil Filter Types
Standard Cooling System
Power Output
Gross Engine Power Output, bhp (kWm)
BMEP at Rated Load, psi (kPa)
Bore, in. (mm)
Stroke, in. (mm)
Piston Speed, ft/min (m/s)
Compression Ratio
Lube Oil Capacity, qt. (L)
Standby
44.8 (33.4)
104.0 (717.1)
3.43 (87.1)
3.62 (91.9)
1091.0 (5.5)
23.0:1
13.2 (12.5)
Prime
40.8 (30.4)
92.0 (634.3)
3.43 (87.1)
3.62 (91.9)
1091.0 (5.5)
23.0:1
13.2 (12.5)
Fuel Flow
Fuel Flow at Rated Load, US Gal/hr (L/hr)
Maximum Inlet Restriction, in. Hg (mm Hg)
Maximum Return Restriction, in. Hg (mm Hg)
3.5 (13.4)
2.0 (50.8)
5.8 (147.3)
3.5 (13.4)
2.0 (50.8)
5.8 (147.3)
Air Cleaner
Maximum Air Cleaner Restriction, in. H2O (kPa)
25.0 (6.2)
25.0 (6.2)
213.0 (6.0)
970.0 (521.1)
41.0 (10.2)
200.0 (5.7)
910.0 (487.8)
41.0 (10.2)
Exhaust
Exhaust Flow at Rated Load, cfm (m3/min)
Exhaust Temperature,oF (oC)
Max Back Pressure, in. H2O (kPa)
Fuel System
Fuel Consumption
60 Hz Ratings, kW (kVA)
Load
US
Gal/hr
L/hr
Indirect injection, number 2 diesel fuel; fuel filter; fuel/water separator; automatic
electric fuel shutoff; distributor injection pump with integral mechanical governor.
Standby
Prime
25 (31)
23 (29)
1/4
1/2
3/4
Full
1/4
1/2
3/4
Full
0.90
1.28
1.72
2.33
0.84
1.17
1.60
2.02
3.4
4.8
6.5
8.8
3.2
4.4
6.1
7.6
S-1236p (6/06)
Alternator
Several alternators are available for application flexibility based on the required motor starting kVA and other requirements.
Larger alternator sizes have lower temperature rise, for longer life of the alternator insulation system. In addition, larger
alternator sizes can provide a cost-effective use of engine power in across-the-line motor starting applications and can be
used to minimize voltage waveform distortion caused by non-linear loads.
These 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 directly from the generator set output.
[ ] 120/208
[ ] 120/240
[ ] 220/380
[ ] 139/240
[ ] 347/600
[ ] 120/240 Delta
[ ] 240/416
[ ] 277/480
S-1236p (6/06)
Specifications Alternator
Design
Stator
Rotor
Insulation System
Standard Temperature Rise
Exciter Type
Phase Rotation
Alternator Cooling
AC Waveform Total Harmonic Distortion
Telephone Influence Factor (TIF)
Telephone Harmonic Factor (THF)
o
o
o
o
o
o
o
o
o
o
o
o
80 C 80 C 80 C 80 C 105 C 105 C 105 C 105 C 125 C 125 C 125 C 125 C
B257
Feature Code
Voltage Ranges
Surge kW
Motor Starting kVA
(at 90% sustained
voltage)
Full Load Current Amps at Standby
Rating
120/208
Thru
139/240
240/416
Thru
277/480
26
111
Shunt
120/208
87
B269
B386
B305
B256
B268
B385
B304
B255
B267
B384
B303
120/208 220/380 347/600 120/208 120/208 220/380 347/600 120/208 120/208 220/380 347/600
Thru
Thru
Thru
Thru
Thru
139/240 139/240
139/240
139/240 139/240
240/416
240/416 240/416
240/416 240/416
Thru
Thru
Thru
Thru
Thru
277/480 277/480
277/480 277/480
277/480
26
26
26
26
26
26
26
26
26
26
26
139/240 220/380
75
48
111
240/416
43
111
277/480
38
111
70
111
90
70
70
111
90
70
347/600
30
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.
80o C 80o C 80o C 105o C 105o C 105o C 125o C 125o C 125o C
B275
B257
B269
B274
B256
B268
B273
B255
B267
Shunt
25
26
26
25
26
26
25
26
26
62
83
83
44
44
83
44
44
83
120/2401 120/2402
69
104
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 up to full set rated 3-phase
kW at 1.0 power factor.
S-1236p (6/06)
Control System
PowerCommand (1301) Control
PowerCommand Control
The PowerCommand Control is an integrated generator set control system providing isochronous governing (optional),
voltage regulation, engine protection, generator protection, and operator interface.
Control provides battery monitoring and testing features, and Smart-Starting control system.
InPower PC-based service tool available for detailed diagnostics
Standard PCCNet RS485 network interface to devices such as remote annunciator for NFPA110 applications.
Control boards are potted for environmental protection.
Suitable for operation in ambient temperatures from 40C to +70C, and altitudes to 13,000 feet (5000 meters)
Prototype tested; UL, CSA, and CE compliant
AC Protection
Engine Protection
Overspeed shutdown
Low oil pressure warning and shutdown*
High coolant temperature warning and
shutdown*
Low coolant level warning or shutdown*
Low coolant temperature warning*
High, low, & weak battery voltage warning*
Fail to start (overcrank) shutdown
Fail to crank shutdown
Redundant start disconnect
Cranking lockout
Sensor failure indication
Low fuel level warning or shutdown
Fuel-in-rupture-basin warning or shutdown
Alternator Data
Engine Data
Other Data
DC voltage*
Lube oil pressure*
Coolant temperature*
Control Functions
Options
Local Operator/Display Panel
Digital Electronic Governing
Auxiliary output relays (2)
120/240 V, 100 W anti-condensation
heater
S-1236p (6/06)
Exhaust System
[ ] Critical grade exhaust silencer
[ ] Industrial grade exhaust silencer
[ ] Residential grade exhaust silencer
[ ] Set mounted critical grade exhaust
silencer
Fuel System
[ ] 24 hour dual wall sub-base fuel tank
[ ] 48 hour dual wall sub-base fuel tank
Alternator
o
[ ] 80 C rise alternator
[ ] 105oC rise alternator
[ ] 120/240 V, 100 W anti-condensation
heater
[ ] Extended stack (full single phase
output)
[ ] Full single phase output (NonReconnectable)
[ ] Single phase - 4 lead
Generator Set
[ ] Batteries
[ ] Battery charger
[ ] Export box packaging
[ ] UL 2200 Listed
[ ] In-skid fuel tank
[ ] Main line circuit breaker
[ ] Sound attenuated enclosures with
mounted silencer
[ ] Spring isolators
[ ] Weather protective enclosure with
mounted silencer
[ ] 2 year prime power warranty
[ ] 2 year standby warranty
[ ] 5 year standby power warranty
S-1236p (6/06)
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. Contact your distributor/dealer for more information.
Certifications
UL - The generator set is available Listed to UL 2200 Stationary Engine Generator Assemblies.
S-1236p (6/06)