Electrical and Trouble Shooting Manual
Contents
1. o A ocenaace ROTOR WINDINGS 250V MDA 30 7 STATOR WINDINGS CAPACITOR WINDING CHARGE WINDING 1 1 1 1 1 1 1 ir DIODE i E BALLAST RESISTER I li EARLY MODELS DC CHARGE i 1 1 DIODE a H r bi ly i CONNECT FORTRE E ffs _____ __ s REQUIRED FREQUENCY r r 1 AND OUTPUT VOLTAGE 3 SREE U A CAPACITOR 701 1 1 MODEL SINGLE A ROTOR 382 tI 18MF 25MF 31 5MF CAPACITOR B STATOR 062 MAKE CERTAIN A REPLACEMENT M Rear 1 a CAPACITOR FOR THE RATING AND MODEL DUAL ROTOR 402 RT NUMBER CAPACITOR STATOR 0400 EXCITER 2 20 t D CHARGER 0140 21 ate CONNECT FOR THE MODEL DUAL ROTOR 400 9 AO OUTPUT VOLTABE EXCITER CIRCUIT STATOR 030 EXCITER 1 3 ohm winding sake D CHARGER 0 080 4 p E mi aa and wie ee A C TERMINAL BOARD CONNECTIONS NOTE When changing from 60Hz to 50Hz make certain the ground wire is WITH CIRCUIT BREAKER CURRENT MODELS r ti pk Li these diagrams WV JWESTERBEKE Engines amp Generators 3 LOW VOLTAGE ROTATING FIELD AUXILIARY WINDINGS TESTS WARNING Some of the following tests reguire the generator to be running make certain the front pulley cover and timing belt covers2. a thin walled deep well 7 16 in 11 mm socket To check the diode unsolder the connection from the top of the diode Place one ohmmeter lead on the connection at the top of the diode and the other ohmmeter lead to the diode s base Then reverse the position of the ohmmeter leads TESTING THE DIODES A low resistance should be found with the leads in one direction and infinite resistance blocking in the other direction DIODES 8 9 5 OHMS APPROXIMATELY USING A 260 SIMPSON ANALOG METER NOTE Different meter models may show different ohm values but should read the same for both diodes DIODE RATING 1600 AMPS 26 AMPS The diode s rating is far in excess of the circuit s requirements Most likely a diode failure wiil result from an overspeed or load surge A CAUTION ON SOLDERING When soldering use a large enough soldering iron to get the job done quickly Excessive heat will damage the diodes Also make certain no soldering splashes onto the windings as it will melt the insulation WESTERBEKE Engines 4 Generators 4 LOW VOLTAGE ROTATING FIELD AUXILIARY WINDINGS TESTS Testing the Rotor Field Auxiliary Windings Testing Continuity With the diode removed both leads for the first group of Check that no continuity exists between either of the wind rotating field auxiliary windings will be isolated with no ing leads and the generator shaft If continuity is found interfere
3. are in place ROTATING FIELD AUXILIARY WINDINGS Description Two sets of windings are found in the rotor assembly An AC voltage is produced in two groups of windings as the rotor turns at rated rpm The AC voltage passes through each of the two diodes mounted on the isolated fixture just before the rotor carrier bearing The AC sine wave is changed to a DC and this DC voltage is passed through the two groups of rotating field windings producing a DC field around these windings This field affects the AC winding of the two main stator groups inducing an AC voltage in these windings that is available at the AC terminal block connections Testing The Windings Thru the Diodes To check the resistance values rotate the engine s crankshaft to position the diode s on the generator s shaft at 12 o clock To make a quick check of these windings presume the diode is OK and place one of the ohmmeter s leads on the connection at the top of the diode and the other lead at the connection at the base of the diode Compare readings with the figures below STANDARD RESISTANCE VALUES ROTATING FIELD AUXILIARY WINDINGS Single Capacitor 3 8 Ohms Dual Capacitor 4 0 Ohms DIODE B A p T RN TESTING THE NT KS WINDINGS THRU THE DIODES pe eX gt K TESTING THE DIODES If a distinct difference is noted in the ohm value carefully unsolder the lead on the top of the diode and remove the diode from its isolated heat sink using
4. A C ELECTRICAL TESTING AND TROUBLESHOOTING GUIDE BC GENERATORS LATE 22 CORPORATION MYLES STANDISH INDUSTRIAL 150 JOHN HANCOCK ROAD TAUNTON 02780 7319 U S A TEL 508 823 7677 FAX 508 884 9688 WEBSITE WWW WESTERBEKE COM WESTERBEKE 65103 Member National Marine Manufacturers Association MARCH 2000 2ND EDITION TABLE OF CONTENTS BC Generator Electrical Testing 2 Generator Troubleshooting 2 Internal Wiring Schematie 3 AC Terminal Board eee een 3 Low Voltage Rotating Field Windings Tests 4 Testing the Diodes scssccscersrertessarensenerssearens 4 Testing the Rotor Field Windings 5 Residual Voltage Exciter Circuit 15 6 Testing the Exciter Windings 6 Exciter Circuit Capacitor s 1 Measuring T Checking Continuity OPR P O 7 Testing the Capacitor s KRK 7 Exciting the Generator 8 No Voltage Main Stator Windings Tests 8 Testing Residual 8 Checking Testing Continuity 2 9 Battery Charging Circuit Bridge Rectifier 10 Testing the Bridge 10 Integral
5. Controller Ballast Resistor 11 Integral Controller 11 11 Measuring 11 integra Controller No Load Voltage 12 Testing the Integra Controller 12 Fuse 12 Single Dual Capacitor No Load Voltage Adjustment No Load Voltage Adjustment Dual Exciter 13 Dual Exciter Circuit Model er an 13 BC Generator Parts 14 A WESTERBEKE Engines amp Generators 1 BC GENERATOR ELECTRICAL TESTING GENERATOR TROUBLESHOOTING CHART C 4 D refer to the components of the INTERNAL WIRING DIAGRAM and their test procedures in the following pages DESCRIPTION The BC generator is a brushless self excited generator which requires only the driving force of the engine to produce an AC output The stator houses two sets of windings the main stator windings and the exciter windings When the generator is started residual magnetism in the four rotating poles induces a voltage in the stator which then generates an even larger voltage in the exciter windings This mutual build up of voltage in the four rotating poles and in the exciter wind ings quickly reaches the saturation point of the capacitor s and a regulated energy field is then maintained in the stator At the same time
6. G POSITION THE METER DIAL CORRECTLY FOR VOLTS EXCITER CIRCUIT TESTS SINGLE CAPACITOR DUAL EXCITER sol Hz 81 SO Hz a7 sal 91 50 1 8 8 60Hz 5092 60Hz Eras 3 DUAL CAPACITOR WESTERBEKE A Engines A Generators 6 EXCITER CIRCUIT CAPACITOR S TESTS Measuring Resistance To measure the resistance of the exciter winding locate the 9 and the 50 Hertz capacitor connections NOTE Three numbered capacitor connections exist 7 8 and 9 and two Hertz connections 50 and 60 Unplug any other connections from the capacitor noting their position on the capacitor Place one probe of the mul timeter on plug connection 9 and the other probe on the 50 Hertz lead Measure the resistance value of the exciter windings and compare to the figures below NOTE Lower residual voltage along with a lower winding resistance will confirm a faulty winding EXCITER WINDINGS RESISTANCE Single Capacitor Dual Capacitor Dual Exciter Model 1 9 ohms _ 2 2 ohms 1 3 ohms 1 5 ohms GENERATOR CASE S CHECKING FOR CONTINUITY BETWEEN LEAD 50Hz amp LEAD 9 TO CASE GROUND _ MEASURING RESISTANCE VALUE OF THE EXCITER WINDINGS BETWEEN LEADS 9 amp S0Hz Checking Continuity 2277 Check to make sure there 15 no continuity to the CHECKING FOR CONTINUITY BETWEEN LEAD 50Hz AND LEAD 9 AC TERMINAL LEADS bpem ground generator case from either of the t
7. HARGE ISOLATOR TERMINAL EARLIER MODEL INTEGRAL CONTROLLER THIS CONTROLLER PERFORMS THE SAME FUNCTION AS THE CURRENT MODEL CONTROLLERS THE DC CHARGE ISOLATOR TERMINAL iS NO LONGER USED THE DC CHARGE LEAD 605 DIRECTLY TO THE BATTERY TERMINAL ON THE STARTER SOLENOID STRIPED WIRES ARE NOW SOLID COLORS VOLT ADJ BALLAST RESISTOR Early model integral controllers have a ballast resistor installed along the DC lead running from the bridge recti fier to the integral controller This coil type resistor functions to suppress high amperage draw coming from the controller when it is trying to charge a discharged starting battery BALLAST RESISTOR a 0 a DC CHARGE EARLIER MODEL GROUND BRIDGE RECTIFIER 0 3 OHM Measuring Resistance The resistance value of the ballast coil is measured between the lifted lead at the bridge rectifier and the 60 Hertz connection unplugged from the controller that is controllers having plugs in the connector Controllers with three leads coming from the controller measure resistance between the unplugged 60 Hertz connection at the bridge rectifier and the brown lead connection on the coil resistor terminal block NOTE New four wire controllers eliminate the ballast resistor circuit since the ballast resistor s function is now handled internally Whenever replacing an early style controller with the newer four wire
8. TERBEK Engines amp Generators 10 INTEGRAL CONTROLLER BALLAST RESISTOR INTEGRAL CONTROLLER VOLT ADJ POT VOLT BRIDGE RECTIFIER YELLOW ORANGE OR RED INTEGRAL CONTROLLER GROUND INTEGRAL CONTROLLER 1 6 The Integral Controller I C is an encapsulated solid state unit that supplies a DC charging voltage to the generator s starting battery while the generator is operating Charging Voltage 13 0 14 0 volts DC Charging Amperage 6 10 amps DC Early Models Charging Amperage 0 17 amps DC Current Models A separate group of stator windings supplies AC voltage to a bridge rectifier which converts the AC current to supply the LC unit The LC unit senses the needs of the starting battery and supplies a DC charge when one is needed If you suspect that the I C unit is faulty that is if the battery s charge is low check the charging circuit and it s components as described in the following steps Check all connections for cleanliness and tightness including the ground before replac ing the LC unit NOTE When the generator is first started the I C unit will produce a low charging rate This charging rate will rise as the generator is operated The Integral Controller is mounted inside the generator hous ing in the 12 00 position There is a voltage output adjust ment on the controller that will allow a DC voltage output adjustment of 2 volts DC C
9. crease or decrease approximately 8 10 volts between connectors used in any pair combination to achieve the prescribed no load voltage 50Hz 60Hz 7 8 9 50Hz 60Hz 7 A WARNING Make certain the insulating covers on the unused leads are in place and are NOT in contact with each other or in contact with the generator s housing NOTE When changing Hertz produced by the generator an engine speed adjustment at the governor must be made The AC output connections on the terminal blocks must be selected for the voltage and Hertz to be produced The Hertz plug connection at the capacitor must be changed for 50 Hertz 5 or 60 Hertz 6 The frame ground wire must be moved when changing from 115 volts 50 Hertz to 230 volts 50 Hertz Refer to the AC TERMINAL BOARD CONNECTIONS 3 On later model BC generators 50Hz 60Hz connection is provided for the DC battery circuit When changing hertz connect the proper lead SOHz or 60Hz to the bridge rectifier BATTERY CIRCUIT CONNECTIONS 50 60Hz CURRENT MODELS AC CONNECTION WESTERBEKE Engines amp Generators 13 CYY WEST Engines 4 Generators 1033 WM DW 3 2000
10. e voltage across the neutral lead and the hot lead with a voltmeter Make sure you record this reading The generator s no load voltage is 115 124 volts at 60 5 61 5 Hertz If the voltage output is higher or lower than specified proceed 4 Shut off the generator Make sure the correct Hertz lead 60 Hertz 6 or 50 Hertz 5 is plugged into the capacitor s CAPACITOR CAPACITOR 50Hz 60Hz DUAL CAPACITOR 12 handling as they store electricity and can pack a poten WARNING Capacitors must be discharged before tially lethal charge even when disconnected from their power source NOTE Simply cross the capacitor s two terminals with an insu lated plastic handle screwdriver This will discharge any excess electricity WARNING Do not attempt to make a no load voltage adjustment while the generator is operating The capacitor can produce a 400 500 volt charge Touching any wiring can produce a severe electrical shock In addition attempting to make a no load volt age adjustment while the generator is operating could cause your fingers to be caught in the generator s rotor 5 There are three plugs grouped for the right capacitor terminal 7 8 and 9 If the generator s no load voltage is low then disconnect the lower numbered plug and connect the plug with the next higher number If the generator s no load voltage is high then disconnect the higher numbered plug and c
11. is a short in the windings There also should be no continuity between the terminals and the generator case ground MAIN STATOR WINDING LEADS TESTING CONTINUITY TESTIN EACH TERMINAL 29 WINDING GROUPS CASE GROUND WESTERBEKE Engines amp Generators 9 BATTERY CHARGING CIRCUIT BRIDGE RECTIFIER TESTING THE BATTERY CHARGING CIRCUIT DC CHARGE I 1 1 1 1 1 t NOTE The battery charging circuit is totally separate from the AC output of the generator The generator output affects the circuits output but not the reverse Normal AC voltage running to the rectifier while the engine is operating at 1800 rpm is measured across the two AC connections on the bridge rectifier shown below AC VOLTAGE TO THE BRIDGE RECTIFIER APPROXIMATELY No load off the generator 16 0 volts AC Full load off the generator 17 5 volts AC BRIDGE RECTIFIER MEASURING DC VOLTAGE ST MEASURING VOLTAGE BETWEEN THE AC LEADS Normal DC voltage running out of the rectifier in volts DC is measured across the two DC connections of the bridge rectifier that is and as illustrated DC VOLTAGE FROM THE BRIDGE RECTIFIER APPROXIMATELY No load off the generator 17 0 voits DC Full load off the generator 18 5 volts DC Lift the two AC wire leads off the bridge rectifier and measure the resistance between these two leads It should measure 0 14
12. l cause low AC voltage output high engine speed high AC output Refer to WESTERBEKE S operators manual or service manual for engine speed hertz adjustment or for other possible engine related problems Before testing get a clear explanation of the problem that exists be certain it relates to generator components A WARNING AC and DC circuits often share the same distributor panel Be certain to unplug AC power cords and shutdown DC AC inverters Simply switching off circuit breakers will not do the job since it will still leave hot wires on the supply side of the panel 2 NOTE This fault finding chart is compiled assuming the engine is operating at the correct speed hertz FAULT CAUSE _ _ AC Output Shorted stator Open stator Shorted diodes two Residual Voltage 4 6 VAC Hot N at no load High Output at No Load Low AC Output 60 1 06V Faulty capacitor Open exciter Shorted exciter Engine speed hertz is too low Electrical connections are faulty aoa ot wo Adjust Inspect wiring connections Incorrect voltage tap on capacitor incorrect capacitor incorrect hertz tap Capacitor Engine speed hertz is too high _Adjust Faulty rotor winding Faulty diode Faulty capacitor Dm Voltage Drop Under Load or at No Load Faulty diode Faulty capacitor Engine speed hertz is 100 low A Adj
13. model remove the ballast resistor and its wiring xy WESTERBEKE Engines amp Generators 11 INTEGRAL CONTROLLER NO LOAD VOLTAGE ADJUSTMENT TESTING THE INTEGRAL CONTROLLER To test the battery charger put a multimeter between the positive and negative leads to the battery It should indicate 13 5V to 14V with the engine running If only the battery voltage is indicated check that the battery charger terminal connections are tight With the unit running test between the and terminals for 13 5V to 14V If no charge is indicated replace the charger INTEGRAL CONTROLLER FUSE PROTECTION 30 amp fuse protects the windings from a failure of the bridge rectifier or integral controller high amperage or a short SINGLE AND DUAL CAPACITOR NO LOAD VOLTAGE ADJUSTMENT 1 Remove the louvered metal plate at the back of the generator covering tae AC terminal connections and the capacitor s 2 Start the generator and allow it to run for approximately five minutes so the engine can warm up Make sure the generator is operating without any eguipment drawing AC current from the generator that is shut off ali electrical appliances Make sure the engine s speed Hertz is correct Adjust the governor as needed to obtain the correct engine speed before proceeding 3 Refer to the AC TERMINAL BOARD CONNECTIONS DIAGRAM for the correct configuration then check the generator s no load voltage by measuring th
14. nce from a possibly faulty diode there is a short in the windings Check the resistance value of the rotating windings by Repeat the above tests on the second set of windings on placing the ohmmeter s probes across the two exposed the opposite side leads ROTOR WINDINGS RESISTANCE VALUES Single Capacitor 3 8 ohms Dual Capacitor 4 0 ohms Dual Exciter Circuit 4 0 ohms TESTING THE WINDING LEADS 2 y gt j A 1 x RY 7 4 ng TESTING FOR D 2 CONTINUITY A TEST BOTH LEADS 2 Engines amp Generators 9 RESIDUAL VOLTAGE TESTING THE WINDINGS AC voltage can be measured across the capacitor s while the generator is operating This voltage may be as high as 400 to 500 volts AC This voltage buildup is accomplished as the exciter windings charge the capacitor s and the capacitor s discharge back into the exciter windings This AC voltage reading is taken between the 60 Hertz connector and the connection plugged into the capacitor s while the generator is operating at its rated Hertz 60 5 61 5 for gasoline models and 61 5 62 0 for diesel models This flow of saturating AC in the exciter windings produces a phase imbalance type of field that effects the auxiliary windings a beneficial result that produces good motor starting characteristics for this type of generator MEASURING AC VOLTAGE GENERATOR RUNNIN
15. ohm No continuity should exist between these two leads and the ground or the main stator windings RESISTANCE BETWEEN AC LEADS 0 14 OHMS BRIDGE RECTIFIER if TESTING A CONTINUITY BETWEEN 2 AC LEADS MEASURING BETWEEN AC LEA ALSO TEST THESE TWO LEADS TO THE AC TERMINAL BLOCK STUDS VERIFY NO CONTINUITY TESTING THE BRIDGE RECTIFIER 1 Set your multimeter s scale on RX1 DC and set the needle to zero Connect the positive lead from the multimeter to point 4 Taking the mullimeter s negative probe momentarily touch points 1 2 3 and 5 The multimeter should register no deflection for any of the points touched Remove the positive probe from point 4 and connect the negative probe momentarily touch points 1 and 3 The multimeter s needle should deflect when point is touched 4 Leaving the negative multimeter probe on point 4 touch point 5 with the positive probe No deflection should take place N Place the positive probe on point 1 and the negative probe on point 3 The multimeter again should not register any deflection no deflection indicates infinite resistance Reverse these connections and the multimeter should again register no deflection THE BRIDGE RECTIFIER FAILS OF THE ABOV TESTS IT SHOULD BE REPLACED BRIDGE RECTIFIER 5 MOUNTING HOLE 3 YY WES
16. onnect the plug with the next lower number Note that the plug presently connected to this termina may be any one of the three plugs available 6 If the generator s no load voltage cannot be adjusted because the voltage needs to be increased and the highest numbered plug is already connected to the right terminal or the voltage needs to be lowered and the lowest numbered plug is connected refer to HERTZ ADJUSTMENT in the operators manual CAPACITOR 7 WIRE ATTACHED 50Hz THE CONNECTIONS SHOWN DEMONSTRATE HOW THESE ADJUSTMENTS 8 WIRE CAN BE MADE ATTACHED EU WESTERBEKE 7 8 9 Engines amp Generators NO LOAD VOLTAGE ADJUSTMENT DUAL EXCITER DUAL EXCITER CIRCUIT MODEL These generators have dual Hertz and no load voltage adjust ment connectors at each capacitor There are five connectors available for each capacitor Two connectors are for Hertz selection 60 Hertz or 50 Hertz and three connectors 7 8 and 9 are for no load voltage adjustment When making Hertz change or no load voltage adjustments proceed as follows 1 Shut the generator down 2 Select the appropriate Hertz connection to plug into each capacitor 60 60 Hertz 1800 RPM or 50 Hertz 1500 RPM The three other connectors at each capacitor 7 8 and 9 will have an effect on the no load voltage produced by the generator One connector from each group can be plugged into each capacitor No load voltage will in
17. put voltage as specified above check exciter circuit TESTING THE MAIN STATOR WINDINGS Test the main stator windings at the AC terminal board by first removing all the AC output leads the ground connection and the brass interconnects This will isolate the six leads on the terminal board which make up the two stator groups AC CONNECTION NOTE The studs on the AC terminal board are identified by the six red wire that attach to them These wires are num bered I thru 6 There are no numbers on the terminal block Testing Residual Voltage Test for residual voltage between terminal 1 and terminal 3 Then test between terminal 4 and 6 shown above RESIDUAL VOLTAGE 2 3 VOLTS AC Correct readings will indicate the stator windings are okay Check the exciter windings 12 VOLT DC 12 VOLT DC CHECK RESISTANCE GROUP 1 Test the resistance value between the 1 terminal and the 3 terminal GROUP 2 Test the resistance value between the 4 terminal and the 6 terminal RESISTANCE VALUES Single Capacitor 0 6 ohms Dual Capacitor 0 5 ohms BCA Mode 0 3 ohms Dual Exciter Circuit 0 5 ohms TESTING MAIN STATOR WINDINGS 60 Hz CONFIGURATION SHOWN CO WESTERBEKE Engines amp Generators 8 NO VOLTAGE OUTPUT MAIN STATOR WINDINGS TESTS Testing Continuity There should not be any continuity between these two wind ing groups Test between terminal 3 and terminal 6 If con tinuity exists there
18. this regulated field produces a steady volt age in the stator windings which can then be drawn off the generator s AC terminals to operate AC equipment The generator is a single phase reconnectable 120 volt AC two wire or 115 volt AC two wire or 230 volt AC two wire at 50 hertz The generator s data plate gives the voltage current and frequency rating of the generator An AC wiring decal is affixed to the inside of the louvered cover at the generator end A diagram of the various AC voltage connections is provided on the decal An Integral Controller IC is mounted inside the generator and supplies a continuous DC charge to the generators starting battery when the generator is running INTRODUCTION TO TROUBLESHOOTING The following test procedures can be used to troubleshoot WESTERBEKE S 4 POLE SINGLE AND DUAL CAPACI TOR BRUSHLESS GENERATORS Due to the simplicity of the generator troubleshooting is relatively easy Field testing and repairing can be accomplished with basic tools and repair parts which should include the following A quality multimeter multitester capable of reading less than one ohm and with a specific diode testing function Basic electrical tools including cutters soldering iron wire strapper crimper terminals connectors etc Repair parts such as diodes fuses bridge rectifier etc PRELIMINARY CHECKING Before electrical testing check for proper engine speed hertz adjustment Low engine speed wil
19. tor 0 Infinite resistance or no rise in resistance shorted capacitor Infinite resistance open capacitor MEASURING CAPACITOR RESISTANCE O L LW TERMINAL 52 R DARD CAPACITOR CONNECTIONS CAPACITOR RATINGS Single Capacitor Models 25 0 MFD 035985 Dual Capacitor Madeis 31 5 MFD 035978 Dual Exciter Models 18 0MFD Pn 039556 NOTE The older single capacitor models have 25 0 microfarad capacitors New models now have 31 5 microfarad capacitors Dual exciter models have a 18 0 MFD capacity The capacitor rating is marked on the housing of the capacitor WESTERBEKE Engines amp Generators 7 NO VOLTAGE OUTPUT MAIN STATOR WINDINGS TESTS EXCITING THE GENERATOR The generator may be excited using 12 volts DC taken from the engine s starting battery This voltage is applied across the 50 and 9 leads of the exciter circuit windings unplugged with any other numbered leads unplugged from the capacitors The generator s reaction during flashing will help determine its fault NORMAL VOLTAGE OUTPUT RANGE DURING 12 VOLT EXCITA TION Single Capacitor 22 26 VAC Dual Capacitor 24 28 VAC Dual Exciter 12 14 D rise in the output voltage with the loading of the engine and or a growling noise from the generator end will indicate a fault in the main stator windings I No rise or a very slight rise in the output voltage will indicate a fault in the exciter windings Normal out
20. ust o Battery Charge Faulty bridge rectifier D Faulty integral controller D Low Battery Charge High Voltage Blown fuse Faulty winding Engine speed hertz Output when Load is too high is applied Unstable Voltage Noisy Operation Electrical connections are faulty loose Faulty support bearing Generator rotor connection to engine is loose B B Adjust Inspect wiring connections inspect rear bearing Check rotor security Refer to the GENERATORS OPERATOR MANUAL Refer to the GENERATORS SERVICE MANUAL s WESTERBEKE Engines amp Generators GENERATORS PARTS IDENTIFICATION ISOLATED CHARGER g TERMINAL SNS EARLY BC MODELS B C GENERATORS ELECTRICAL COMPONENTS DUAL CAPACITOR SHOWN GENERATOR CASE CAPACITOR BRASS je INTERCONNECTS BRIDGE 1 RECTIFIER AC TERMINAL BOARD CURRENT MODEL B GENERATORS ELECTRICAL COMPONENTS SINGLE CAPACITOR SHOWN 7 BALLAST RESISTER k CONTROLLER EARLY MODELS CAPACITOR CURRENT MODEL CONNECTIONS GENERATORS x ELECTRICAL COMPONENTS DUAL EXCITER SHOWN GENERATOR CASE CAPACITOR BRIDGE CAPACITOR RECTIFIER CONNECTIONS LEAD a SA WESTERBEKE Engines 4 Generators 2 10 CIRCUIT BREAKER INTERNAL WIRING SCHEMATIC DC BATTERY CHARGING CIRCUIT WINDING NO TIME B
21. wo leads Also check that no continuity exists between either the 50 Hertz plug or the 9 plug and any of the main stator winding leads on the AC output If continuity is found here a fault exists between these two winding groups An AC voltage is induced in these windings by the rotating field Checking the residual voltage output from this winding can determine the condition of the winding when troubleshooting Test between leads 50 and 9 with leads lifted off the capacitor s RESIDUAL VOLTAGE Single Capacitor Model 10 14 Volts from each winding Duat Exciter Model Dual Capacitor Model 7 9 Volts AC from each winding 14 16 Volts AC from each winding TESTING THE CAPACITORS DISCHARGING THE CAPACITOR gt WARNING Capacitors must be discharged before handling as they store electricity and can pack a poten tially lethal charge even when disconnected from their power source Discharge the capacitor by bridging the terminals with an insulated screwdriver Connect a multitester highest ohm scale to the capacitor ter minals The meter should go to zero ohms and slowly return to high Discharge the capacitor again and reverse the leads the same results should be obtained If the meter goes down and stays at zero ohms the capacitor is faulty shorted If the meter fails to go down to zero the capacitor is faulty open circuited Indications of a defective capaci
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