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Cummins NT855 Series

Diesel Engines

Model

Prime

kW(kVA)

Standby

kW(kVA)

Engine

Model

BM-250A

250 (312)

275 (343)

NT855G6

CB-280A

280 (350)

312 (390)

NTA855G4

Technical Data

Engine
Cummins NT/A855, 6 cylinder, diesel engines. 50°C radiator. 24 Volt starting, battery charge alternator. Spin-on replaceable element fuel and oil filters. Electronic governor. Dry element air filter.

Alternator
Brushless, single bearing, revolving field. 4-pole screen protected drip proof.
Class H insulation.
Rotor and exciter impregnated with tropical grad insulating polyester resin.
Epoxy coated stator winding.
Sealed solid state automatic voltage regulator. Permanent magnet exciter.

Chassis
Fabricated and welded chassis. Built-in anti-vibration mountings. In-skid fuel tank. Flexible fuel lines.

  12 Lite Detector Control Panel
Controls generator set start and shutdown.
Automatic remote start.
DC panel lighting.
Panel mounted on vibration isolators.
Analog gauges display performance trends.
Panel Standard Specification
Run-stop-remote switch.
Automatic remote starting, 2 wire.
Coolant temperature gauge.
Oil pressure gauge.
DC voltmeter.
Running time meter.
Fault reset switch.
Lamp test switch.
AC voltmeter / ammeter with selector switch.
Dual scale frequency meter / tachometer.
Emergency stop.
Engine monitoring and shutdown for:
-low oil pressure
-high coolant temperature
-over crank
-over speed
-low coolant level
Common external alarms
 

Circuit Breaker Cubicle
3-pole moulded case circuit breaker with optional shunt trip and auxiliary contacts.

Finish
High gloss green finish

General
Set of operating and instruction manuals.

Options
Refer distributor for range details.

Optional MONZA Acoustic Enclosure

- 70 dBA @ 7 metres (average).
- 4 point lift and skid ends standard.
- Central lifting frame optional.
- Lockable doors. Vertical air discharge.
- Compact footprint design.

Optional CONTRACTOR Acoustic Enclosure
-85dBA @ 1 m (average).
- 4 point lift standard.
- Locable doors.
- Central lifting frame optional.
- Extended fuel tank option(with skid ends opt).
- Vertical air discharge


 

Technical Data

Generating Sets

Set model

BM-250A

CB-280A

Prime rating*

250kWe 312kVA

280kWe 350kVA

Standby rating"

275kWe 343kVA

312kWe 390kVA

Set output

380/415V 50 Hz

380/415V 50 Hz

Engine make

Cummins

Cummins

Model

NT855G6

NTA855G4

Cylinders

Six

Six

Engine configuration

In-line

In-line

Governor / class

Electronic

Electronic

Aspiration

Turbocharged

Turbocharged Aftercooled

Bore and stroke

140mm x 152mm

140mm x 152mm

Compression ratio

14:1

14:1

Cubic capacity

14 Litres

14 Litres

Cranking current @ 0°c

640A

640A

Engine Output-Prime

272 kWm

309 kWm

Nett at flywheel- standby

302 kWm

342 kWm

Max. load acceptance - single steps

172 kWe

175 kWe

Alternator size (Prime)

HC434E

HC434F

Alternator voltage regulation

±1.0%

±1.0%

Alternator insulation class

H

H

Fuel consumption (Prime) 100% load

69 L/hr

76 L/hr

Fuel consumption (Standby) 100% load

76 L/hr

84 L/hr

Lubrication oil consumption

0.5% of fuel consumption

0.5% of fuel consumption

Lubrication oil capacity

38.6 Litres

38.6 Litres

In-skid fuel tank capacity-open set

600 Litres

600 Litres

Fuel tank capacity - MONZA Canopy

1300 Litres

1300 Litres

Fuel tank capacity - CONTRACTOR Canopy

850 Litres

850 Litres

Ext. fuel tank capacity - CONTRACTOR Canopy

1300 Litres

1300 Litres

Coolant capacity-radiator and engine

69.3 Litres

69.8 Litres

Exhaust temp-full load

574°C

524°C

Exhaust gas flow-full load prime

1.071 m3/s, 3855.6M3/hr

1.128M3/s, 4060.8M3/hr

Exhaust gas back pressure max

10.2 kPa, 76mm Hg

10.2 kPa, 76mm Hg

Air flow-radiator (50°C ambient)

8.6M3/s, 30960M3/hr

8.6 m3/s, 30960m3/hr

Air flow - engine intake

0.3608m3/s, 1299M3/hr

0.408m3/s, 1468.8M3/hr

Heat radiated to ambient

57 kW

65 kW

Derating factors - temp.

2% per 11 °C above 40°C

2% per 11 °C above 40°C

Derating factors - altitude

4% per 300m above 1525m

4% per 300 m above 1525m

 

 
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© Copyright 1996-2001 Macfarlane Generators
Email: info@macgen.com
Updated: July 30, 2001