Manufacturer:

DCEC Cummins

Model:

4B3.9-G2

Standby Power:

30KW 

Rated Speed:

1500（r/min）

Cycle:

4 stroke

Cylinder Arrangement:

4 in line

Displacement:

3.9L

Bore and Stroke:

102*120（mm） 

Compression Ratio:

16.5:1

Governor Type:

RSV Mechanical(Std) / Electronic (Optional) 

Start battery voltage:

24V DC

Air Intake System

Air Intake System:

Air natural cooled

Max Intake Restriction:

5kPa

Burning Capacity:

1.98m3/min

Air Flow:

136m3/min

Exhaust Gas Flow:

4.27m3/min

Exhaust Temperature:

410℃ 

Max Back Pressure:

10kPa

Fuel System:

A model fuel pump

100%( Prime Power) Load:

228g/kwh

50%( Prime Power) Load:

243g/kwh

Total Oil Capacity:

11L

Oil Consumption:

≤0.4g/kwh

Engine Oil Tank Capacity:

9.5L

Oil Pressure at Rated RPM:

345kPa

Cooling Way:

Water-cooled

Total Coolant Capacity:

21L

Thermostat:

82-95℃ 

Max Water Temperature:

104℃ 

Manufacturer:

STARLIGHT/ 
STAMFORD/ 
SIEMENS/ 
MARATHON/ 
ENGGA / 
KEPU

Excitation Mode:

time harmonic wave excitation

Number of phase and Access Act:

3-phase 4-wire

Connecting Type:

"Y" type connecting

Alternator Capacity:

30KVA

Alternator Efficiencies:

95％

Overload:

（PRP）110% load can run 1h

Protection Level:

IP22-IP23

Insulation Class, Temperature Rise:

H/H

Telephone Influence Factor (TIF):

＜50

THF:

＜2%

Voltage Regulation, Steady State:

≤±1%

Air Cooling Flow:

2.69m3/s

Altitude:

≤1000m

Voltage Regulation:

≥±5%

Voltage Regulation, Stead State:

≤±1%

Sudden Voltage Warp (100% Sudden Reduce):

≤+25%

Sudden Voltage Warp (Sudden Increase):

≤-20%

Voltage Stable Time (100% Sudden Reduce):

≤6S

Voltage Stable Time (Sudden Increase):

≤6S

Frequency Regulation, Stead State:

≤5%

Frequency Waving:

≤1.5%

Sudden Frequency Warp (100% SuddenReduce):

≤+12%

Sudden Frequency Warp (Sudden Increase):

≤-10%

FrequencyRecoveryTime(100%SuddenReduce):

≤5S

FrequencyRecoveryTime(Sudden Increase):

≤5S