Allegro RED Owner's Manual - Tiffin Motorhomes

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TIFFIN MOTORHOMES –ALLEGRO RED® Chapter 7 ELECTRICAL FEATURESCautionFailure to turn “off” the 120 VAC appliances when starting or stopping the generator maydamage the transfer switch and/or electrical appliances.For more detailed operating instructions and to determine necessary preventive-maintenance schedules andprocedures, review the manufacturer owner’s manual.Automatic Transfer SwitchThe automatic transfer box switches AC power from shore to generator to the coach main distribution panel. This isachieved by the closing and opening of contactors that are located in the box interior (see diagram on AutomaticTransfer Switch which is located in owner’s information package). Power from shore is fed through contacts located onR4 and R5. Power input is sensed by electrical board B1. If shoreline neutral is present it will allow relay R1 to energizewhich energizes relays R2 and R3 applying shore power to the main control box located in the motor home. If the unitsenses that an open neutral condition exists, R1 will not energize not allowing the coach to receive the potentiallyappliance damaging voltage. Power from the generator is sensed by board B1 and after a delay of 15-20 seconds; R4and R5 energize automatically disconnecting shore power B1checks for generator neutral and if present allow R2 andR3 to energize allowing generator power to the main control panel.CautionService to this box is to be done by a qualified technician. DO NO attempt toremove cover unless shore cord is unplugged and generator is off.If the unit is plugged into shore but no power to coach then make sure the shore outlet has power. Ifpower is present this may indicate the unit is sensing an open neutral condition. Start the generator. If power isrestored to the coach then neither the shore plug or outlet may be defective (the neutral line may be broken).If there is no power to coach from shore or generator then check the generator circuit breaker. If the circuitbreakers are not tripped in generator or coach, replace transfer box.For more detailed information on the automatic transfer switch, please refer to the specific owner’s instructionsfound in the owner’s information package.7-10
TIFFIN MOTORHOMES –ALLEGRO RED® Chapter 7 ELECTRICAL FEATURESResettable Circuit BreakersThe resettable circuit breakers (Figure 7-14) are located within 18 inches of thesource of power; that is, the converter and the battery. When the circuit breakersare shut down or electrically tripped, they must be manually reset. Tofind the circuit breakers, follow the line from the battery or converterapproximately 18 inches—this may lead to a junction box or to a cabinet insidethe Allegro RED or to a similar location.As needed, manually reset the circuit breaker or breakers as shown in theaccompanying figure. Be careful when working around these connections as anaccidental, electrical short to ground (i.e., momentarily connecting the “positive”or “hot” terminal to any part of the chassis) can be hazardous and harmful.Figure 7-14. Circuit BreakersFuse BlocksSome of the electrical circuitry within the motor home is protected byvarious fusing systems. Some of these fuse blocks are immediatelyaccessible on the driver’s side exterior compartment. These fuse blocks(Figure 7-15) protect some of the major electrical systems of immediateconcern to the driver.Should there be any electrical failure of these components or systems,the first diagnostic or troubleshooting procedureshould be to check the fuses and have available replacements to replaceany blown fuses, as may be warranted.Also the Allegro RED contains a computerized diagnostic center usuallyattached to the steering column under the dash. This center permits aFigure 7-15. Fuse Blocks in exterior compartment ondriver’s sidecomputer to be connected to the onboard diagnostic center monitoring many of the operating functions andparameters of the engine so that the current operating status of the engine can be determined and any anomalies orproblems may be noted. This diagnostic tool enables the motor home owner to maintain an updated status of theengine so that the overall reliability ofthe motor home can be maintained.As an aid to extracting and/or installing fuses in the fuse blocks, one may wish to buy an inexpensive fuse puller at anyelectronics or hardware store. This tool makes the installation or removal of fuses much easier and prevents inadvertentdamage to nearby fuses or the fuse block itself.Whenever a fuse has been “blown” and is to be extracted and replaced, it is good practice to examine the wiringgoing to that particular fuse to see if there is any noticeable degradation (e.g., wiring insulation nicked, missing,or melted) which may indicate damage beyond the fusing proper.7-11
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Allegro RED Owner's Manual - Tiffin Motorhomes

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