HomeCummins/OnanCummins/Onan C12 D6

Cummins/Onan C12 D6 Generator Set

The Cummins/Onan C12 D6 is a 10.8 kW (14 kVA) Diesel standby generator set powered by a Cummins/Onan C12D6T engine. It is available at 416/240 V and 220 V, 3-phase and 60 Hz. The set measures 1667×930×1282 mm (65.6×36.6×50.5 in), weighs about 601.5 kg (1326 lb) and produces 77 dBA at 1 m. An integrated tank holds 1000 L (264.2 gal).

10 kW
Standby
2.5 L
Displacement
1
Document types

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Specifications

FuelDiesel
Frequency60.0 Hz
Standby power10 kW
Standby kVA14
Prime power10 kW
ControllerPowerCommand 1.1, PowerStart 0600
AlternatorCummins/Onan DS338-CPGK, DS340-CPGK, DS342-CPGK, DS339-CPGK, DS341-CPGK, DS343-CPGK (Class H insulation)
Voltage options230 V, 240 V, 220/380 V, 230/400 V, 240/416 V
Phase3
Power factor1.0
Battery voltage12 V
Battery quantity1
Max ambient50 °C
Dimensions (L×W×H)1667×930×1282 mm
Dry weight601 kg
Sound level77.0 dBA @ 1 m
Fuel tank1000.0 L

Engine

Cummins/Onan C12D6T
Displacement2.5 L
AspirationNatural aspiration

Filters & service parts

model family
ItemSpecCapacityPart #Interval
Air filterDry replaceable element find
Fuel filterSpin on fuel filters with water separator find
Oil filterSpin on full flow filter, filtration efficiency 25 micron 99% (min) find
BeltN/A find
CoolantAntifreeze 50/50 (Ethylene glycol)
OilCummins heavy-duty engine oil

Compiled from this model's family documentation — may include parts for closely-related variants. Confirm the exact part for your serial number.

Common questions

What is the power rating of the Cummins/Onan C12 D6?

The Cummins/Onan C12 D6 is rated 10 kW standby (14.0 kVA).

What engine does the Cummins/Onan C12 D6 use?

The Cummins/Onan C12 D6 is powered by the Cummins/Onan C12D6T engine.

What fuel does the Cummins/Onan C12 D6 use?

The Cummins/Onan C12 D6 runs on Diesel.

What alternator does the Cummins/Onan C12 D6 use?

The Cummins/Onan C12 D6 uses a Cummins/Onan DS338-CPGK, DS340-CPGK, DS342-CPGK, DS339-CPGK, DS341-CPGK, DS343-CPGK alternator. Insulation class H.

Troubleshooting

17

Fault codes

CodeMeaning
59High AC voltage shutdown
27Low AC voltage shutdown
81 uUnder frequency shutdown
81 oOver frequency shutdown/warning
51High Current warning/shutdown

Symptoms & remedies

SymptomCauseRemedy
Battery voltage warningStatus of battery charging system (failure)
Emergency stop signal is receivedThe generator set immediately shuts down and cannot run or crank with the E-stop switch engaged.
Time delay of 0-600 seconds prior to shutdown after signal to stop in normal operation modesDefault for both time delay periods is 0 seconds.
Undervoltage sensor pickup and dropout adjustable from 85-100% and 75-98%Dropout adjustable delay from 0.1-30 sec.
Overvoltage sensor dropout adjustable from 105-135% of nominalDropout adjustable delay from 0.5-120 sec.
Over/under frequency sensor underfrequency sensing pickup and dropout adjustable from 85-100% and 70-85%Dropout adjustable delay from 0.1-15 sec.
Over/under frequency sensor overfrequency sensing dropout adjustable from 105-115% of nominalDropout adjustable delay from 0.1-15 sec.
Time delay start and stop (cooldown) configurable for time delay of 0-300 seconds prior to starting after receiving a remote start signalControl provides retransfer time delays including time delay emergency to normal (0-1800 sec), programmed transition delay (0-600 sec), and time delay engine cooldown (0-3600 sec).
Low lube oil pressure warning/shutdownLevel is pre-set to match the capabilities of the engine used. Control includes time delays to prevent nuisance shutdown signals.
High coolant temperature warning/shutdownLevel is pre-set to match the capabilities of the engine used. Control includes time delays to prevent nuisance shutdown signals.
Low coolant temperature warningIndicates that engine temperature may not be high enough for 1 min. and start or proper load acceptance.
Sensor failure indicationLogic is provided on the base control to detect analog sensor or interconnecting wiring failures.

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

Fuel consumption

RatingLoadL/hgal/h
Prime
Standby

Available documents

Spec sheet — EMERS-5627-EN (Cummins/Onan)Spec sheet — EMERS-5669-EN (Cummins/Onan)Spec sheet — SS26-CPGK (Cummins/Onan)