HomeCummins/OnanCummins/Onan DQBB

Cummins/Onan DQBB Generator Set

The Cummins/Onan DQBB is a 350 kW Diesel standby generator set powered by a Cummins/Onan N14-G2 engine. It is available at 24 V, 3-phase, 60 Hz and rated 12 A. It holds about 34 L (9.0 gal) of oil and 51 L (13.5 gal) of coolant. Starting uses 2 group-8 batteries rated 1400 CCA at 12 V. The set measures 5486×1676×2515 mm (216.0×66.0×99.0 in), weighs about 6532 kg (14401 lb) and produces 75 dBA at 7 m. An integrated tank holds 89.8 L (23.7 gal).

350 kW
Standby
34.0 L
Oil capacity
3
Document types

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Specifications

FuelDiesel
Frequency60.0 Hz
Standby power350 kW
Prime power315 kW
ControllerDetector, PowerCommand
Oil capacity34.0 L
AlternatorCummins/Onan S-1154
Voltage options24 V
Phase3
Rated current12 A
Battery group['8D']
Battery cranking1400 CCA
Battery voltage12 V
Battery quantity2
Coolant capacity51 L
Dimensions (L×W×H)5486×1676×2515 mm
Dry weight6532 kg
Sound level75.0 dBA @ 7 m
Fuel tank89.8 L

Maintenance & consumables

for the Cummins/Onan N14-G2
ItemSpecCapacityPart #Interval
Air filter find
Fuel filterFuel Filter find
Oil filterOil Filter find
Belt find
CoolantCoolant
Coolant filter find
OilEngine Oil

Common questions

What is the power rating of the Cummins/Onan DQBB?

The Cummins/Onan DQBB is rated 350 kW standby.

What engine does the Cummins/Onan DQBB use?

The Cummins/Onan DQBB is powered by the Cummins/Onan N14-G2 engine.

What fuel does the Cummins/Onan DQBB use?

The Cummins/Onan DQBB runs on Diesel.

What alternator does the Cummins/Onan DQBB use?

The Cummins/Onan DQBB uses a Cummins/Onan S-1154 alternator.

Troubleshooting

9

Fault codes

CodeMeaningCauseRemedy
231Warning lamp lights.Indicates battery voltage exceeds 32 VDC. Contact an authorized service center.
250Shutdown lamp lights.Indicates PCC memory error. Data corruption of critical operating parameters. Contact an authorized service center.
102Engine shuts down and will not crank.Indicates local or remote Emergency Stop.To reset the local Emergency Stop button : Pull the button out or turn the switch clockwise (button with arrow) and allow it to pop out. Move the Run/Off/Auto switch to Off. Press the Reset switch. Select Run or Auto, as required.

Symptoms & remedies

SymptomCauseRemedy
Engine starts from generator control panel but will not start automatically or from a remote panel.(Note: The Run/Off/Auto switch must be in the Auto position for automatic or remote starting). Check the control wiring between the remote switch and the PCC. Contact an authorized service center.
No AC output voltage.Contact an authorized service center.
Control does not power up when the Run/Off/Auto switch is set to Run or the Self Test switch is pressed.There is no DC power to the control.A. Check for battery disconnected, discharged, or improperly connected. b. Fuse F1 (20A/32V, Type 3AG) may be open. Replace with the same type. (Fuse is mounted near engine starter/solenoid, see Figure 4-2). Contact an authorized service center.
Warning, Shutdown, and Non-Automatic lamps are not lit. Digital display shows main menu or selected menu.Indicates all engine systems are normal. No corrective action required
Non-Automatic lamp flashes.Indicates Run/Off/Auto switch is not in the Auto position. This will prevent automatic starting if an automatic transfer switch is used.Move the Run/Off/Auto switch to the Auto position for automatic operation.
Engine continues to operate at reduced RPM.Indicates that the engine is operating in idle mode. When the set is operating in the RUN mode, grounding the engine idle input causes generator build-up to be inhibited and the engine to be governed at 800 RPM.

Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.

Parts

4
Part #DescriptionQtySystem
0300-4623-09DFCB (600V)1Current transformer buy
0300-4623-10DFCC (600V)1Current transformer buy
0300-4623-24DFCB BR (0-480V)1Current transformer buy
0300-4623-27DFCC BR (0-480V)1Current transformer buy

Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.

Fuel consumption

RatingLoadL/hgal/h
Prime
Standby

Available documents

Spec sheet — Cummins-installation-manual-DFAA-DFAB-DFAC-DFBC-DFBF-DFBD-DFBE-DFBF-DFCB-DFCC-DFCE-DFEB-DFEC-DFED-DFFA-DFFB-DFGA-DFGB-DFGC-DFJA-DFJB-DFJC-DFJD-DFLA-DFLB-DFLC-DFLD-DFLE-DFMB-DQAA-DQAB-DQBA-DQBB (Cummins/Onan)Spec sheet — s-1285 (Cummins/Onan)Parts manual — 960-0268 Onan DQAA DQAB DQBA DQBB Parts Manual (9-1991) (Cummins/Onan)Service manual — 960-0101C Cummins DFBF DFCB DFCC DFCE DQBA DQBB Operators Manual (3-2001) (Cummins/Onan)Service manual — 960-0507C Cummins DFAA thru DFMB DQAA Service Manual (2-2004) (Cummins/Onan)Service manual — Detector Control Generator Set Service Manual (Cummins/Onan)

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