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1. ANDERSON INDIANA U S A Deico HRemy SERVICE BULLETIN Bulletin 1R 116A Date 8 1 60 10 Pages File Under l R RELAYS AND REGULATORS Page 1 STANDARD WATERPROOF REGULATORS VOLTAGE REGULATOR UNITS WITH ACCELERATOR WINDING This bulletin covers Delco Remy standard three unit waterproof generator regulators containing an accelerator winding on the voltage regulator unit and having a suffix letter B or C following the model number The Delco Remy three unit regulators illustrated by Fig 1 are designed for use with generators which have the field circuit insulated in the gener ator and grounded in the regulator These regula tors differ from those discussed in Bulletin 1R 116 only in design features Changes in design have altered the routing of the field circuit within the regulator Methods of adjustrnent remain basically ue same for the regulators described in both bul etins i Regulators covered in this bulletin are most often used on aircraft and 24 volt applications They in clude an accelerator or series winding on the vol tage regulator unit Adjusting procedures for this type voltage regulator unit differ from those pro cedures used on voltage regulator units that do not contain an accelerator or series winding The regulator shown in Figure 1 consists of a cutout relay a voltage regulator and a current regulator unit The cutout relay closes the generator to bat tery circuit when the g2. at the connections or in the regulator winding 5 Burned Resistances Windings or Contacts These result from open circuit operation open resistance units or high resistance in the charging circuit Where burned resistances windings or con tacts are found always check car wiring before installing a new regulator Otherwise the new regulator may also fail in the same way 6 Burned Relay Contact Points This may be due to reversed generator polarity Generator po larity must be corrected as explained on page 4 after any checks of the regulator or generator or after disconnecting and reconnecting leads Service Bulletin 1R 115A Page 6 STANDARD REGULATORS CLEANING CONTACT POINTS The contact points of a regulator will not operate indefinitely without same attention It has been found that a great majority of all regulator trouble can be eliminated by a simple cleaning of the con tact points plus some possible readjustment The flat points should be cleaned with a spoon or riffler file On negative grounded regulators which have the flat contact point on the regulator armatures loosen the contact bracket mounting screws so that the bracket can be tilted to one side Fig 5 On positive grounded regulators the flat point is in the upper contact bracket so the bracket must be re moved for cleaning the points A flat file cannot be used successfully to clean the flat contact points since it will not touch the cente
3. im solid red The series winding in the voltage regulator is armature is attached to the frame by a flexible hinge so that it is just above the core The arma ture has a contact point which is just below a sta tionary contact point When the current regulator is not operating the tension of a spiral spring holds the armature away from the core so that the points are in contact In this position the generator field circuit is completed to ground through the current regulator contact points in series with the voltage regulator contact points CURRENT REGULATOR ACTION When the load demands are heavy as for example when electrical devices are turned on and the battery is in a discharged condition the voltage may not increase to a value sufficient to cause the voltage regulator to operate Consequently generator out put will continue to increase until the generator reaches rated maximum current This is the current value for which the current regulator is set There fore when the generator reaches rated output this output flowing through the current regulator winding creates sufficient magnetism to pull the current regulator armature down and open the contact points With the points open resistance is inserted into the generator field circuit so that the generator output is reduced As soon as the generator output starts to fall off the magnetic field of the current regulator winding is reduced the spiral spring tension pulls
4. the arma ture up the contact points close and directly con nect the generator field to ground Output increases REGULATOR VOLTAGE GENERATOR shown in blue and the above cycle is repeated The cycle con tinues to take place while the current regulator is in operation 50 to 200 times a second preventing the generator from exceeding its rated maximum When the electrical load is reduced electrical de vices turned off or battery comes up to charge then the voltage increases so that the voltage regu lator begins to operate and tapers the generator output down This prevents the current regulator from operating Either the voltage regulator or the current regulator operates at any one time the two do not operate at the same time RESISTANCES The current and voltage regulator circuits use a common resistor Figs 2 amp 3 which is inserted in the field circuit when either the current or voltage regulator operates A second resistor Figs 2 amp 3 is connected between the regulator field terminal and the cutout relay frame which places it in parallel with the generator field coils The sudden reduction in field current occurring when either the current or voltage regulator contact points open is accompanied by a surge of induced vol tage in the field coils as the strength of the mag netic field changes These surges are partially dis sipated by the two resistors thus preventing exces sive arcing at the c
5. 50 or in the wiring harness If the output drops off the regulator is at fault and it should be checked for a high voltage setting or grounds and poor ground connections HIGH CHARGING RATE Lii E Fee DISCHARGED 3 Low Battery and High Charging Rate This is normal generator regulator action Regulator settings may be checked as outlined in the fol lowing section LEZ 7 2 y LOW OR NO CHARGING RATE i Y DISCHARGED UNDERCHARGING 4 Low Battery and Low or No Charging Rate This condition could be due to a Loose connections or damaged wires b Defective battery c High circuit resistance d Low regulator setting e Oxidized regulator contact points f Defects within the generator If the condition is not caused by loose connections or damaged wires proceed as follows to locate cause of trouble To determine whether the generator or regulator is at fault momentarily ground the F terminal of the regulator and increase generator speed If the output does not increase the generator is probably at fault and it should be checked as out lined in Service Bulletin 1G 150 If the generator output increases the trouble is due to a A low voltage or current regulator setting b Oxidized regulator contact points which in sert excessive resistance into the generator field circuit so that output remains low c Generator field circuit open within the regu lator
6. UICK CHECKS OF GENERATOR AND REGULATOR In analyzing complaints of generator regulator operation any of several basic conditions may be found L Ep CHARGING RATE FULLY CHARGED 1 Fully Charged Battery and Low Charging Rate This indicates normal generator regulator operation Regulator settings may be checked as outlined in the following section HIGH CHARGING RATE FULLY CHARGED 2 Fully Charged Battery and a High Charging Rate This indicates that the voltage regulator is not reducing the generator output as it should A high charging rate to a fully charged battery will damage the battery and the accompanying high voltage is very injurious to all electrical units This operating condition may result from a Improper voltage regulator setting b Defective voltage regulator unit c Grounded generator field circuit in either generator regulator or wiring d Poor ground connection at regulator and high speed operation e High temperature which reduces the resis tance of the battery to charge so that it will accept a high charging rate even though the voltage regulator setting is normal If the trouble is not due to high temperature determine the cause of trouble by disconnecting the lead from the regulator F terminal with the generator operating at medium speed If the out put remains high the generator field is grounded either in the generator see Service Bulletin 1G 1
7. and adjustments are required on the voltage regulator air gap and voltage setting Air Gap to check air gap push armature down until the contact points are just touching and then measure air gap Fig 5 Adjust by loosening the contact mounting screws and raising or lowering contact bracket as required Be sure the points are lined up and tighten screws after adjustment Voltage Setting There are two ways to check the voltage setting the fixed resistance method and the variable resistance method Figs 6 and 8 D SCFVICe DUNGCTIM IK LHIOA Page 7 STANDARD REGULATORS Fixed Resistance Method 1 Connect a fixed resistance between the battery terminal and ground as shown in Fig 6 after disconnecting the battery lead from the battery terminal of the regulator The resistance must be 34 ohm for 6 volt units 14 ohms for 12 volt units 7 ohms for 24 volt units It must be capable of carrying 10 amperes for 6 and 12 volt systems 6 7 amperes for 24 volt systems without any change of resistance with tempera ture changes NOTE With all 6 volt regulators having current ratings less than 15 amperes it is necessary to use a 114 ohm fixed resistance to avoid interference from the current regulator With all 12 volt regulators having current ratings less than 15 amperes a 21 4 ohm fixed resistance ohm and 114 ohm resistors in series must be used for the same reason 2 Connect a voltmeter from regu
8. ase turn out the resistance until cutout relay points close Note closing voltage With cover in place slowly increase turn in resistance to make sure points open 3 Adjust closing voltage either method by turn ing adjusting screw Fig 12 Turn screw clockwise to increase setting and counterclock wise to decrease setting ADJUSTING SCREW TURN TO ADJUST CLOSING VOLTAGE Figure 12 Adjustment of cutout relay closing voltage Service Bulletin 1R 115A Page 10 STANDARD REGULATORS eR CURRENT REGULATOR Two checks and adjustments are required on the current regulator air gap and current setting Air Gap Check and adjust in exactly the same manner as for the voltage regulator Current Setting Current regulator setting on current regulators having temperature compen sation should be checked by the following method LOAD METHOD 1 Connect ammeter into charging circuit as in Figure 13 2 Turn on all accessory load lights radio etc and connect an additional load across the bat tery such as a carbon pile or bank of lights so as to drop the system voltage approximately one volt below the voltage regulator setting ie Operate generator at specified speed for 15 min utes with cover in place This establishes oper ating temperature see paragraphs 3 and 4 in General Instructions If current regulator is not temperature compensated disregard 15 min ute warm up peri
9. at least 0 5 of a volt less than voltage regulator setting 2 If battery is consistently undercharged at normal setting increase the voltage setting 0 1 of a volt and check for improved condition over a reasonable service period Repeat until the battery remains charged with a minimum use of water It rarely will be necessary to in crease the voltage above 14 8 on a 12 volt sys tem or 7 5 volts on a 6 volt system or 29 6 volts on a 24 volt system OEEO T ETEN TO CLEAN CONTACT POINTS LOOSEN UPPER CONTACT BRACKET MOUNTING SCREWS Figure 4 Illustrating use of spoon or riffler file to clean flat contact points in regulator CAUTION When increasing voltage avoid settings high enough to damage lights or other voltage sensitive equipment during cold weather operation Before tailoring the voltage setting for unusual conditions be sure the battery is normal not sul fated not permanently damaged due to having been overheated not operating in too hot a loca tion and not poorly ventilated REGULATOR CHECKS AND ADJUSTMENTS See Delco Remy Service Bulletins 1R 180 1R 185 or 1R 186 for Specifications Procedure For best results the following steps should be taken in the sequence given 1 Bring voltage regulator to operating tem perature 2 Check voltage regulator 3 Check cutout relay 4 Bring current regulator to operating temperature 5 Check current regu lator VOLTAGE REGULATOR Two checks
10. ed by hand with the battery connected to the regulator This would cause a high current to flow through the units which would seriously damage them 2 Electrical checks and adjustments may be made either on or off the vehicle The regulator must always be operated with the type generator for which it is designed 3 The regulator must be mounted in the operating position when electrical settings are checked and adjusted and it must be at operating tem perature Operating temperature for voltage regulator checking and adjusting is reached after 15 min utes of continuous operation of the voltage regu lator unit with the regulator cover in place and the proper resistor in series with the generator For proper resistance values see the Voltage Setting procedure under the Regulator Checks and Adjustments section It is not necessary to measure the amount of current flowing during warm up or testing of the voltage unit however it is important that no electrical load other than ignition be turned on during the test If a vari able resistor is used in series with the battery set to 1 10 amperes for warm up period Oper ating temperature for temperature compensated current regulators is reached after 15 minutes of operation with current regulator operating and cover in place Noncompensated current regu lators operate the same hot or cold Operating temperature therefore may be disregarded 4 Specified genera
11. enerator voltage is sufficient to charge the battery and it opens the circuit when the generator slows down or stops The voltage regulator unit is a voltage limiting device that prevents the system voltage from exceeding a specified maximum and thus protects the battery and other voltage sensitive equipment The current regulator unit is a current limiting device that limits the generator output so as not to exceed its rated maximum Figure 2 is a wiring diagram of this type regulator when the vehicle frame is the ground return Figure 3 is a wiring diagram of this same type regulator when a wire is the ground re turn which makes it an insulated or two wire system CUTOUT RELAY The cutout relay Figs 2 amp 3 has two windings a series winding of a few turns of heavy wire shown in solid red and a shunt winding of many turns of fine wire shown in dashed red The shunt wind ing is connected across the generator so that CO 1 2 1 WDS amp PS 1 2X 131 132 16 1FD CURRENT REGULATOR VOLTAGE REGULATOR BATTERY TERMINAL GENERATOR TERMINAL FIELD TERMINAL Figure 1 Delco Remy three unit current and voltage regu lator with the cover removed generator voltage is impressed upon it at all times The series winding is connected in series with the charging circuit so that all generator output passes through it The relay core and windings are as sembled into a frame A flat steel armature is at tached t
12. ified speed Adjust variable resistor until current flow is 8 10 am peres 4 6 amperes on 6 and 12 volt generators having current ratings of less than 15 amperes If less current than is required above is flowing it will be necessary to turn on vehicle lights to permit increased generator output Variable re sistance can then be used to decrease current flow to the required amount Allow generator to operate at this speed and T current flow for 15 minutes with regulator a cover in place in order to bring the voltage i regulator to operating temperature 5 Cycle the generator by either method listed ct Step 5 of Fixed Resistance Method of Vol Figure 1 Adjusting voltage regulator setting ae Setting procedure Variable Resistance Method 6 Note the thermometer reading and select the h te f 1 Connect ammeter and 4 ohm variable resistor a arae d A secifcations 1 180 IR 188 or TR in series with the battery as shown in Figure 8 186 NOTE It is very important that the variable resistance be connected at the BAT terminal pi om in Figure 6 7 Note the voltmeter reading with regulator cover rather than at the GEN terminal even though these in place terminals are in the same circuit An examination of the a wiring diagram Figures 2 and 3 will show that regulation 8 Adjust voltage regulator as reguired as de S begins at the point where the shunt windings are con scribed in Step 8 of Fixed Resistance Me
13. is likely to bend the spring support After installing a new spring re adjust the unit setting as already described RADIO BY PASS CONDENSERS The installation of radio by pass condensers on the field terminal of the regulator or generator will cause the regulator contact points to burn and oxidize so that generator output will be reduced and a rundown battery will result If a condenser is found connected to either of these terminals dis connect the condenser and clean the regulator contact points as previously explained
14. lator BAT ter minal to ground AIR GAP CHECK WITH POINTS JUST TOUCHING CONTACT MOUNTING SCREWS LOOSEN TO SET AIR GAP Figure 5 Voltage regulator air gap check and adjustment 3 Place the thermometer within 1 4 inch of regu lator cover to measure regulator ambient tem perature 4 Operate generator at specified speed for 15 minutes with regulator cover in place to bring the voltage regulator to operating temperature 5 Cycle the generator Method A Move voltmeter lead from BAT to GEN terminal of regulator Retard gen erator speed until generator voltage is reduced to 2 volts on a 6 volt system or 4 volts on a 12 volt system or 6 volts on a 24 volt system Move voltmeter lead back to BAT terminal of regulator Bring generator back to specified speed and note voltage setting Method B Connect a variable resistance into the field circuit as in Figure 6 Turn out all resistance Operate generator at specified speed Slowly increase turn in resistance until gen erator voltage is reduced to 2 volts on a 6 volt system 4 volts on a 12 volt system or 6 volts on a 24 volt system Turn out all resistance again and note voltage setting with voltmeter con nected as in Figure 6 Regulator cover must be in place 6 Note the thermometer reading and select the Normal Range of Voltage for this temperature as listed in specifications 1R 180 1R 185 iR 186 REGULATOR E
15. mr m a e ae a e oe 3 4 OHM 6 VOLT 11 2 OHM 12 VOLT lt 7 OHM 24 VOLT h VOLTMETER GENERATOR Figure 6 Fixed resistance and voltmeter connections to check voltage regulator setting by fixed resistance method Fixed resistance leads shown in red and voltmeter leads shown in blue Variable resistance may be connected as shown for cycling generator 7 Note the voltmeter reading with regulator cover in place 8 To adjust voltage setting turn adjusting screw Fig 7 Turn clockwise to increase setting and counterwise to decrease voltage setting CAUTION If adjusting screw is turned down clockwise beyond range spring support may not return when screw is backed off In such case turn screw counterclockwise until there is ample clearance between screw head and spring support Then bend spring support up carefully until it touches the screw head Final setting of the unit should always be made by increasing spring ten sion never by reducing it If setting is too high adjust unit below required value and then raise to exact setting by increasing the spring tension After each adjustment and before taking reading replace the regulator cover and cycle the generator Service Bulletin 1R 116A STANDARD REGULATORS E t 3 Place thermometer within inch of regulator ADJUSTING SCREW cover to measure regulator ambient tempera ee TURN TO ADJUST SETTING ture 4 Operate generator at spec
16. n blue This reverse flow of current through the series winding causes a reversal of the series winding magnetic field The magnetic field of the shunt winding does not reverse Therefore instead of helping each other the two windings now mag netically oppose so that the resultant magnetic field becomes insufficient to hold the armature down The flat spring pulls the armature away from the core so that the points separate this opens the circuit between the generator and battery VOLTAGE REGULATOR The voltage regulator Figs 2 amp 3 has two wind ings assembled on a single core a shunt winding consisting of many turns of fine wire shown in dashed red which is shunted across the generator and a series winding of a few turns of relatively heavy wire shown in solid blue which is con nected in series with the generator field circuit when the regulator contact points are closed The windings and core are assembled into a frame A flat steel armature is attached to the frame by a flexible hinge so that it is just above the end of the core The armature contains a contact point which is just beneath a stationary contact point When the voltage regulator is not operating the tension of a spiral spring holds the armature away from the core so that the points are in contact and the generator field circuit is completed to ground through them VOLTAGE REGULATOR ACTION When the generator voltage reaches the value for which the v
17. o the frame by a flexible hinge so that it is centered just above the end of the core The armature contact points are located just above the stationary contact points When the generator is not operating the armature contact points are held away from the stationary points by the tension of a flat spring riveted on the side of the armature CUTOUT RELAY ACTION When the generator voltage builds up a value great enough to charge the battery the magnetism induced by the relay windings is sufficient to pull the armature toward the core so that the contact points close This com pletes the circuit between the generator and bat tery The current which flows from the generator to the battery passes through the series winding in a direction to add to the magnetism holding the armature down and the contact points closed When the generator slows down or stops current begins to flow from the battery to the generator PRINTED IN U S A Service Bulletin 1R 115A Page 2 STANDARD REGULATORS CUTOUT CURRENT BATTERY RELAY REGULATOR SERIES WINDING SHUNT WINDING AMMETER VOLTAGE REGULATOR GENERATOR Figure 2 Wiring circuit of Delco Remy grounded type three unit regulator shown in Figure 1 The shunt windings in the cut out relay and voltage regulator are shown in dashed red The series windings in the cutout relay and current regulator are shown in solid red The series winding in the voltage regulator is shown i
18. od j Cycle generator and note current setting pi Adjust in same manner as described for the voltage regulator Fig 7 CONNECT TO REGULATOR Lae VOLTMETER GENERATOR Figure 13 Connections for checking current regulator by load method JUMPER LEAD METHOD Use only for cur rent regulators without temperature compensa tion i 1 Connect ammeter into charging circuit as in Figure 14 JUMPER LEAD BRIDGING VOLTAGE REGULATOR CONTACT POINTS GENERATOR Figure 14 Ammeter and jumper lead connections for checking current regulator setting by jumper lead method Ammeter leads and jumper leads shown in red Only for current regulators without temperature compensation 2 Connect jumper lead across voltage regulator points as in Figure 14 3 Turn on all lights and accessories or load battery as in 2 under Load Method 4 Operate generator at specified speed and note current setting 5 Adjust in same manner as described for the voltage regulator Fig 7 REPAIR SECTION REGULATOR SPRING REPLACEMENT If it becames necessary to replace the spiral spring on either the current or voltage regulator unit the new spring should first be hooked on the lower spring support and then stretched up until it can be hooked at the upper end Stretch the spring only by means of a screwdriver blade inserted between the turns or in a similar manner do not pry the spring into place as this
19. oltage regulator is adjusted the magnetic field produced by the two windings shunt and series overcomes the armature spring tension and pulls the armature down so that the contact points separate This inserts resistance into the generator field circuit so that the generator field current and voltage are reduced Reduction of the generator voltage reduces the magnetic field of the regulator shunt winding Also opening the regulator points opens the regulator series winding circuit so that its magnetic field collapses completely The conse quence is that the magnetic field is reduced suf ficiently to allow the spiral spring to pull the ar mature away from the core so that the contact points again close This directly grounds the gener ator field circuit so that generator voltage and out put increase The above cycle of action again takes place and the cycle continues at a rate of 50 to 200 times a second regulating the voltage to a pre determined value With the voltage thus limited the generator supplies varying amounts of current to meet the varying states of battery charge and electrical load CURRENT REGULATOR The current regulator Figs 2 amp 3 has a series winding of a few turns of heavy wire shown in red which carries all generator output The wind ing core is assembled into a frame A flat steel Service Bulletin 1R 116A Page 3 STANDARD REGULATORS BATTERY rent regulator are shown
20. ontact points NOTE The second resistor is not present on all regulators Many Aircraft regulators have this re sistor omitted Service Bulletin 1R 116A Page 4 STANDARD REGULATORS PR o TEMPERATURE COMPENSATION Voltage regulators are compensated for tempera ture by means of a bimetal thermostatic hinge on the armature This causes the regulator to regu late at a higher voltage when cold which partly compensates for the fact that a higher voltage is required to charge a cold battery Many current regulators also have a bimetal thermostatic hinge on the armature This permits a somewhat higher generator output when the unit is cold but causes the output to drop off as temperature increases REGULATOR POLARITY Some regulators are designed for use with negative grounded systems while other regulators are de signed for use with positive grounded systems Using the wrong polarity regulator on an instal lation will cause the regulator contact points to pit badly and give short life As a safeguard against installation of the wrong polarity regulator all regulators of this type have the model number and the polarity clearly stamped on the end of the regulator base REGULATOR MAINTENANCE GENERAL INSTRUCTIONS 1 Mechanical checks and adjustments air gaps point opening must be made with battery disconnected and regulator preferably off the vehicle CAUTION The cutout relay contact points must never be clos
21. r of the flat point where point wear is most apt to occur NEVER USE EMERY CLOTH OR SANDPAPER TO CLEAN THE CONTACT POINTS Remove all the oxides from the contact points but note that it is not necessary to remove any cavity that may have developed ADAPTING VOLTAGE REGULATOR SETTING FOR UNUSUAL CONDITIONS The voltage regulator setting at times may need to be tailored to adapt it to the battery and type of service The ideal setting is that which will keep the battery at or near full charge with minimum use of water The normal setting value shown in test specifications usually will be satisfactory for average service However if service is above or below average the setting must be tailored to fit the job Either of two conditions which may exist will require tailoring 1 battery is being overcharged using too much water 2 battery remains undercharged 3 4 charge or less Correc tions may be made as follows 1 If battery uses too much water at normal set ting reduce voltage setting 0 1 or 0 2 of a volt and check for improved condition over a rea sonable service period Repeat until battery re mains charged with a minimum use of water It rarely will be necessary to go below 13 8 volts on a 12 volt system or 6 9 volts on a 6 volt system or 27 6 volts on a 24 volt system CAUTION Whenever the voltage setting is re duced the cutout relay must also be checked and reduced if necessary It must be
22. resistance con nections for checking voltage regulator setting by the variable Closing Voltage resistance method Variable resistance and ammeter leads shown in red and voltmeter leads in blue 1 Connect regulator to proper generator and bat PR Service Bulletin TR 116A Page 9 STANDARD REGULATORS tery Connect voltmeter between the regulator GEN terminal and ground Fig 11 2 Method A Slowly increase generator speed and note relay closing voltage Decrease gen erator speed and make sure the cutout relay points open AIR GAP we CHECK WITH POINTS m gt JUST TOUCHING ADJUSTING SCREWS LOOSEN TO SET AIR GAP Figure 3 Cutout relay air gap check and adjustment Battery must be disconnected when this check is made Method B Make connections as in Step 1 but in addition add a variable resistor connected UPPER ARMATURE STOP BEND TO ADJUST POINT OPENING POINT OPENING Figure 10 Cutout relay point opening check and adjustment Battery must be disconnected when this check is made VOLTMETER GENERATOR Figure 11 Voltmeter connections to check cutout relay clos ing voltage Variable resistance may be connected as shown for cycling generator into the field circuit Fig 11 Use a 15 ohm 25 watt resistor for 6 volt systems or 25 ohm 25 watt resistor for 12 and 24 volt systems Oper ate generator at medium speed with variable resistance turned all in Slowly decre
23. thod nected to the series circuit Any small resistance added to of Voltage Setting Procedure In using the the circuit between the generator and this point will simply be offset by a rise in generator voltage without affecting variable resistance method it is necessary to the output shown at the ammeter readjust the variable deen after each vol a z tage adjustment to assure t 8 10 amperes are 2 Coane Snel between BAT terminal flowing 4 6 amperes on low output units ang groun Cycle generator after each adjustment before ith REGULATOR CONNECT To ei voltage regulator setting with cover in CUTOUT RELAY The cutout relay requires three checks and ad justments air gap point opening and closing vol tage The air gap and point opening adjustments must be made with the battery disconnected AIR GAP Place fingers on armature directly above core and move armature down until points just close and then measure air gap between arma ture and center of core Fig 9 On multiple contact point relays make sure that all points close simultaneously If they do not bend spring finger so they do To adjust air gap loosen two screws at the back of relay and raise or lower the armature as required Tighten screws after adjust ment gt RESISTANCE AMMETER VOLTMETER GENERATOR POINT OPENING Check point opening and ad f just by bending the upper armature stop Fig 10 Figure 8 Voltmeter ammeter and variable
24. tor speeds for testing and ad justing f a Voltage Regulator 1 For passenger cars and trucks 3 500 gen erator r p m 2 Operating speed for constant speed en gines light aircraft engines included in this classification 3 Governed speed for governed engines b Current Regulator 1 All generators must be operated at a sufficient to produce current in excess of specified setting 2 Voltage of the generator must be kept high enough to insure sufficient current output but below the operating voltage of the voltage regulator unit 5 After any tests or adjustments the generator on the vehicle must be polarized after leads are connected but before the engine is started as follows POLARIZING GENERATOR After reconnecting leads momentarily connect a jumper lead between the GEN and BAT terminals of the regulator This allows a momen tary surge of current to flow through the generator which correctly polarizes it Failure to do this may result in severe damage to the equipment since reversed polarity causes vibration arcing and burning of the relay contact points CAUTION If a fuse is located on the regulator polarize the generator by momentarily placing a jumper between the GEN terminal and the screw on the fuse to which the lead is connected If the other screw on the fuse is touched the fuse may blow Service Bulletin 1R 116A Page 5 STANDARD REGULATORS Q
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