Onan Generator Flashcards by Preston Newman

Onan is used to power the ___-volt lighting, electrical outlets, and battery charger on apparatus

110 volt

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An Onan Mobile Genset, model 7.5HDKAL-1C 1995 - 2003

An Onan Mobile Genset, model 7.5HDKAL-1E, 2006 - 2009

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Onan Generator

AC Volts - \_\_\_\_
KVA - \_\_\_\_
kW - \_\_\_\_
Amps - \_\_\_\_
Hz - \_\_\_\_
RPM - \_\_\_\_

AC Volts - 120/240

KVA - 7.5

kW - 7.5

Amps - 31

Hz - 60

RPM - 1800

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The Onan is powered by a Diesel engine. A pressurized, closed-loop liquid cooling system cools the engine. Coolant is pumped through passages in the engine block and head and is cooled in a genset-mounted radiator.

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Onan Generator

The Genset uses the apparatus batteries to power its controls and starting circuits.

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Onan Controls are located in three locations:

1) switches mounted on the generator itself,
2) control box inside the left compartment on the chassis
3) switches located on the dash board of the tractor cab.

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Onan Generator

The controls located on the generator consist of a -

start/stop/pre-heat switch,

oil pressure gauge,

temperature gauge,

volts gauge

hour meter.

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Onan Generator

The control box in the left compartment on the chassis consists of a -

start/stop/pre-heat switch

circuit breaker panel. (Two main breakers)

2000 - 2009
quartz light switches

cord reel rewind speed control

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Onan Generator

The tractor cab dashboard controls consist of a -

star/stop/pre-heat switch

indicator light.

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Onan Generator

Pre-heat Switch

Switch used to preheat the Onan engine prior to starting (___ seconds max.).

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Onan Generator

DC Control Breaker

Circuit breaker that protects the ___-volt components of the generator.

12 - volt

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Onan Generator

Cord Reel -

Reel contains ___’ of electrical cord with two ___-amp receptacles.

200’

20-amp

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Onan Generator

Electric Cord Reel Outlet Box

Electrical box contains __ 20-amp receptacles, each on their own circuit.

two

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Onan Generator

Trailer Quartz Lights

Controlled by switches in the left cab compartment and one on each light assembly. Lights are removable.

which years don’t have controls in the cab?

1995/1996

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Onan Generator

Trailer Quartz Lights 2000 - 2009

Controlled by switches in the left cab compartment, cab dashboard and one on each light assembly. Lights are removable.

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Onan Generator

When operating, the Genset supplies power to the electrical panel located in the left compartment of the tractor chassis. The electrical panel consists of ten (10) circuit breakers that control the following accessories:

1995 has 10 circuit breakers
1996 has 11 circuit breakers
2000-2009 12 circuit breakers

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Onan Generator

The Genset will shut down or its circuit breakers will trip if the sum of the loads exceeds the Genset rating.

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Onan Generator

Note that the Genset may shut down due to overload, even though the sum of the loads is less than the Genset rating, when a large motor is started last or cycles off and then on again. The reason for this is that the motor start up load is much larger than the running load.

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Onan Generator

If a circuit breaker in the main power distribution panel or on the Genset trips, there is either a short circuit or too much load. Note that the Genset will continue to run after a circuit breaker trips.

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Onan Generator

An appliance that causes a circuit breaker to trip right away probably has a short or the circuit breaker is faulty.

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Onan Generator

Keep a no-load operation to a minimum. During no-load operation combustion chamber temperatures drop to the point where the fuel does not burn completely, causing
slobbering and white smoke. Always have some load connected when the Genset is running for long periods.

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When starting the onan Disconnect all loads from the Genset.

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Onan Generator

When stopping the Genset, let it cool down by running at no-load for ___ to ____ minutes.

3 to 5 minutes

Onan - Engine Oil Pressure ___ – ___ PSI @ normal operating temp.

28 - 64

Onan - Engine Coolant Temperature ____ to ____ F

160 degrees - 195 degrees

Onan - DC Voltmeter ____ – ___ Volts

12.5 - 15

Onan Generator 2006 only The Generator Logic Control (GLC) is designed to automatically start or stop the generator. Depending upon how the control is set, the Generator will start when either the battery voltage becomes too low, or the time of day for auto-start has occurred. In addition to starting the generator, the control can be set to stop the generator at a specific time.

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2006 Generator Logic Control (GLC) If the control is set for AUTO, the generator will start when the house batteries are low (below ___ Volts) and will run until the battery voltage has exceeded ___ volts for ___ hour.

12. 1 13. 3 one

2006 Generator Logic Control (GLC) To enter Auto mode, press the button marked “AUTO”, the indicator light on the button will light. When the generator is running, the lightning bolt symbol will illuminate. To turn auto mode off, press the Auto mode button.

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2006 Generator Logic Control (GLC) To set the time of day, stop time or start time, press and hold the corresponding button for ____ seconds until the hour digit flashes. Push the “UP” or “DOWN” button to set the hour.

three

2006 Generator Logic Control (GLC) When starting the generator, the Generator Logic Control will crank the generator for ___ seconds. If it has not started by the end of that time, it will stop for ___ seconds and retry again. If, after the ___ attempt the generator does not start, “GEN FAIL” will flash on the display. To clear this message, press the “START/STOP” button.

5 5 5

2006 Generator Logic Control (GLC) DISPLAY The Generator Logic Control can display the time of day, battery voltage, and the generator run time. To scroll through the different displays, press either the “UP” or “DOWN” buttons. The corresponding LED indicator will illuminate to let you know which mode you are viewing.

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2006 Generator Logic Control (GLC) MANUAL OPERATION To manually start or stop the generator, press and release the START/STOP button. When starting, the generator will crank the starter for 5 seconds. If the generator does not start, it will attempt again. If the generator does not start after the fifth attempt, the display will read “GEN FAIL”.

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2006 Generator Logic Control (GLC) ACTIVITY TIMER When the generator is started, a timer is started in the controller. The timer counts down from 24 hours. If at the end of 24 hours, no activity has been observed, the controller will exit from auto mode and the generator will stop. If activity has occurred, the controller will stay in auto mode.

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Onan The following is the procedure for starting the Onan generator: 1. Disconnect all loads from the Genset. 2. Push the start button once (cab, generator or electrical panel). The generator will automatically pre-heat and start when complete. 3. Connect the electrical loads after the Genset has warmed up for a few minutes. 4. Check for fuel, exhaust, oil and coolant leaks. 5. When stopping the Genset, let it cool down by running at no-load for three to five minutes. Then push the stop button (cab, generator or electrical panel) to stop the generator.

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