EI VA-1A Installation & Operation Instructions - buy
Contents
1. sesn dwy euQ 9 unus neg Sl JO epis UOUMS J9 Se A JO sng eui oi pejoeuuoo l oro eq pinoys seul eseu_L jew peu ejeuuoj poy 7 OK 0 sy Apua bwo lt i pee MH lt eave o l junus staat A d rew wg ics wd WY E A epu BQ E a n ewa BUO M eeu Buuo M f N C E dg 6 d N E J NO a f JoyeWayy H 101uJ8llV 71 Pey eujBu3 UML e uj pej e1su VASH PUL XX VL VA eJnBi4 21 RSVA 3 Wiring Diagram W0225923 RSVA 3 Back Panel End View Symbol Male C t op nes Male Female gt ee To Left Alt Shunt Brown female conn To Left Alt Shunt Red male conn gt To Batt Shunt Red female conn lt To Batti Shunt Orange Gal OOM a obe ATI ir Orange female conn To Right Alt Shunt Orange White male gt To Brown wire on the VA 1A XX Orange White female To Orange wire on the VA 1A XX 22 Specifications and Operating Features 80224921 Model VA 1A and VA 1A XX Weight VA 1A 9 oz VA 1A XX 7 5 oz S 50 100 amp Shunt 3 oz S 300 300 amp Shunt 12 oz RSVA 3 External Select Switch 3 5 oz Power Requirements 7 to 40 volts 2 10 AMP Display 35 high resolution LCD display viewable in direct sunlight 12 and 24 volt backlight wires are provided for night op2. cssscssssessscsssesecssecsseeeees 17 VA 1A and VA 1A XX Circular Connector 0 cccccccccccccccsssscsssssscccssccececeesesssseesees 18 RSVA 3 Installation Instructions ccccccccccssscssssssssssscccccecessscecssssssccscccccecessesesesees 19 Le Install the External SHUN erc aeo e EOD ce ER eer reete arre eerte cov eere ree edens 19 2 Install the VA 1A XX Instrument eeeeeeeeeeeceeeeenn n eren eene nenne nene nie tenens sitet eite nne se eee ttes e ns e eate nen 19 3 Route the Shunt Wires eese nee e eene eehne tnr erst seni e tene ne esee ne terne eset nett n ess e ee tenens 19 4 Route the Instrument Wires to the RSVA 3 ssssssseeeeee eene e eeeenen nen ener ener nitent eerie eren 19 5 Install the RSVA 3 in the Panel c ccsssscsccocsssssscecccscosssotcccccecscessenscessscesssoncececscessscescesescovscsnenecees 20 NEGO HOMINES T T I 20 RSVA 3 Wiring Diagram cecidit dins ne Ee ne me een me ccm 22 Specifications and Operating Features cssccssccsssccssccssccssscescessecssseessessssssseeseneees 23 STC Information ane eee sinnsre teari eens ree ea erent See Back Pages Warranty Agreement Electronics International Inc warrants this instrument and system components to be free from defects in materials and workmanship for a period of one year from the user invoice date Electronics Interna tional Inc will repair or replace any item under the terms of this Warranty
3. aircraft Since the engine is off all of the current is being supplied by the battery The VA 1A will show a discharging condition the Discharge light will be on and display an accurate reading of the total current drain from the battery With all your electrical equipment off this will be around 2 to 6 amps In this mode of operation any piece of electrical equipment can be checked for proper operation by performing the follow ing steps A Note the amps reading on the VA unit Operating Instructions VA 1A Installed in the Battery Lead B Turn on the piece of electrical equipment you wish to check C If this piece of electrical equipment is working properly you will see an increase in load current that corresponds to the current that piece of equipment requires Compare this current with the current you measured for that same piece of equipment at an earlier date Using this method with the digital display of the VA 1A many important aircraft functions strobes retracts radios transponder ADFs DMES pitot heat etc can be checked from the pilot s seat It would be worth while to write down the load current for the entire system and for each piece of equipment This would give you something to compare to when you wish to check for proper operation at a later date You may also check the entire electrical system with one check by turning all the electrical equipment on and comparing the amps reading with your normal readi
4. 1A XX is an external shunt unit X X your aircraft shunt value in amps It is possible for any instrument to fail thereby displaying inaccurate high low or jumpy readings Therefore you must be able to recognize an instrument failure and you must be proficient in operating your aircraft safely in spite of an instrument failure If you do not have this knowledge contact the FAA or a local flight instructor for training The ability for this product to detect a problem is directly related to the pilots interpretation and observation skills The pilot must understand the operation of this product before flying the aircraft Do not allow anyone to operate the aircraft that does not know the operation of this product Keep the Operating Manual in the aircraft at all times Contents WARRANTY ossstostostassixrietirieiistosxptix S iter sit Sari susbontaguatbecetensseceemspanienadesusseenianseacece 2 VA 1A VA 1A XX Operating Instructions ccssccsssessscessesesecssccsseceseeesseesseeesnes 3 lunc T M PY 3 VA IA Installed in the Battery Lead rentre treten eerte cerae eta tee dei a PNE VA 1A Installed in the Alternator Lead eese eene e enenenennnn neee nennen eere n enne 6 VA 1A VA 1A XX Installation Instructions eeeeeeeeeee eee eene eeeenun 8 General InfOrf atlOB 2 eot A E hare tea eer ede rh ex eee dedu et Levee R EEEE ER 8 Iistallattorucso
5. amps that will match any shunt on the market If your aircraft does not have an external shunt and you elect to install an external shunt then order the VA 1A 50 and S 50 shunt 100 amp capability For aircraft drawing more than 100 amps order the V A 1A 300 and an S 300 shunt 300 amp capability Please note The VA 1A and VA 1A 50 resolve to amp and all other units resolve to 1 amp With our digital display one amp resolution will still make an excellent electrical diagnostic tool since the current requirements for almost all pieces of equipment in an aircraft are more than one amp Installation 1 Important Information and Initial Check Out A The installer and aircraft owner must read the Warranty before starting the installation There is information in the Warranty that may alter your decision to install this instrument If you do not accept the terms of the Warranty do not install this instrument B If you are not an FAA Certified Aircraft Mechanic familiar with the issues of installing aircraft VA instruments Do Not attempt to install this instrument The installer should use current aircraft stan dards and practices to install this instrument refer to AC 43 13 8 Installation Instructions 1 Important Information and Initial Check Out D Read the entire Installation Instructions and resolve any issues you may have before starting the installa tion This may eliminate any delays once the installation
6. engine off the discharge light on the VA 1A XX should be on the Volts position will read 11 9 to 12 5 volts 23 8 to 25 volts for a 24 volt system and the Amps position should read 2 0 to 10 0 amps depending on your current load for the aircraft Changing the load will change the amps reading With the master on and the engine on all lights on the VA 1A XX will be off the Volts position will read 13 2 to 14 8 volts 26 4 to 29 6 for a 24 volt system and the Amps position will read 5 0 to 15 0 amps and reducing rapidly shows batter changing current Changing the load will not change the amps reading See the operating section of this manual for futher details RSV A 3 in the Left or Right Alternator Position With the master on and the engine off the discharging light on the VA 1A XX instrument will be on the Volts position will read 11 9 to 12 5 volts 23 8 to 25 volts for a 24 volt system and the Amps position should read 0 0 amps 3 amps Changing the load will not change the amps reading With the master on and the engine on all lights on the VA 1A XX will be off the Volts position will read 13 2 to 14 8 volts 26 4 to 29 6 for a 24 volt system and the Amps position will read 5 0 to 25 0 amps and reducing rapidly shows battery charging current plus load current for the aircraft Changing the load will change the amps reading See the operating section of this manual for futher details 20 an r26 180
7. A 1A will work accurately from 40 to 7 volts far below where most electrical equipment starts to fail 7 VA 1A VA 1A XX Installation Instructions II 040934 Rev C 2 24 92 General Information There are two types of volt amp meters used in aircraft Internal Shunt Units and External Shunt Units 1 Internal Shunt Units Electronics International Inc manufactures a VA 1A which is our only internal shunt unit It has the shunt built into the unit has two large lugs on the back of the unit and all of the electrical current passes through this gauge Use this gauge if your aircraft is currently wired for an internal shunt unit or if you elect to route your main alternator or battery supply line up to the instrument panel As with all internal shunt units the current capability is limited The VA 1A is capable of handling 100 amps continuous current If your aircraft s electrical system is designed to draw more than 100 amps continuous current you should use one of our external shunt units 2 External Shunt Units An external shunt is a strip of metal usually mounted on a bakelite base This metal is made of special alloys to produce a very small precise signal when current passes through it and 1s not affected by temperature changes If your aircraft currently has an external shunt you should order a gauge to match that shunt Electronics International manufactures a line of external shunt units VA IA XX XX shunt value in
8. Installation Instructions 4 Install the External Shunt 4 Install the External Shunt External Shunt Unit Only VA 1A XX Note If you are replacing an existing ammeter the shunt may already be mounted in the aircraft If this 1s the case you should have ordered a VA 1A XX unit that matches your shunt The external shunt should be installed in an appropriate location that minimizes the routing of main cables refer to the wiring diagram in this manual appropriate for your installation It should also be mounted in a location where inadvertent damage cannot occur If the shunt can be accessed easily it should be covered When mounting the shunt use self locking or safety wired nuts In some rare instances a shunt may be mounted in the negative battery lead to ground The VA 1 XX may be connected to this shunt and will work properly 5 Route the Circular Connector Starting from under the instrument panel route the circular connector end of the wire harness up to the instrument mounting location See the wiring diagram at the back of this section Place the circular connector about 8 inches back from the panel Tie wrap the harness in place approximately 1 foot back from the circular connector This will allow the harness to be flexible and accommodate varying lengths in instrument wires Be sure these wires do not obstruct the freedom of travel of any controls 6 Route the Power and Ground Wires Route the red wire in the w
9. Only the battery charging current can be monitored for this installation With the mode selector switch in the Volts position the VA 1A will display the bus voltage to 1 volts With the engine running the alternator is capable of raising the bus voltage to a dangerously high level It is the voltage regulator s job to limit the bus voltage between 13 5 and 14 8 volts double these levels for a 24 volt system Look for this level on the VA 1A A low voltage reading will cause the battery to charge very slowly A high reading can damage the battery and most of your electrical equipment If the aircraft bus voltage goes to a dangerously high level 15 3 volts or higher a bright red High Volts light on the VA 1A will warn you of this condition If this happens turn the field to the alternator off to eliminate the over voltage condition Operating Instructions VA 1A Installed in the Battery Lead Another common electrical problem is a discharging condition If this condition goes unnoticed which it normally does you will end up with a dead battery in flight rendering all of your electrical equipment useless To help you avoid this situation the VA 1A has a Discharge Warning Light which acts as an early warning alerting you as soon as the battery goes into a discharging condition The amount of discharging current can be displayed in the Amps position Discharging current will be displayed as a minus number If this situation o
10. Volts Amps BE Primary Instruments VA 1A VA 1A XX amp RSVA 3 Operating and Installation Instructions OI 041032 and II 040934 4 9 83 Rev C 2 24 92 Now Works in All Shunt Locations and comes with External Warning Control Line S N 74000 and up HIGH VOLTS DISCHARGE ELECTRONICS INTERNATIONAL VOLTS 3 AMPS Electronics International Inc 63296 Powell Butte Hwy Bend OR 97701 541 318 6060 Buy ELcom lt gt Important Notice ok sk sk sk sk MUST READ sk sk ok k k If you think it is not important to read this manual you re wrong This manual contains important installation information that may affect the safety of your air craft delay your installation or affect the operation of your instrument You Must read this manual prior to installing your instrument Any deviation from these installation instructions is the sole responsibility of the installer pilot and may render the STC invalid Read the Warranty Agreement There is information in the Warranty Agreement that may alter your decision to install this product If you do not accept the terms of the Warranty Agreement do not install this product This product may be returned for a refund Contact Electronics International inc for details Check that the instrument make and model marked on the side of the instrument and on the invoice are correct before starting the installation The VA 1A is an internal shunt unit and the VA
11. ation via a one amp fuse see the RSVA 3 Wiring Diagram at the back of this section Pair the wires for each shunt and crimp a female connector onto the wires connecting to the terminal of each shunt and a male connector onto the wires connecting to the terminal of each shunt Red slip on connectors are provided in the RSVA 3 kit When preparing the wires to be crimped strip each wire and double the wires over Dou bling the wires over and a good tight crimp are critical for a good reliable connection Connect the shunt wires to the RSVA 3 switch 4 Route the Instrument Wires to the RSVA 3 Route the brown and orange wires in the VA 1A XX instrument wire harness to the RSVA 3 switch mount ing location Crimp a female connector onto the brown wire and a male connector onto the orange wire Red slip on connectors are provided in the RSVA 3 kit When preparing the wires to be crimped strip each wire and double the wires over Doubling the wires over and a good tight crimp are critical for a good reliable connection Connect the VA 1A XX instrument wires to the RSVA 3 switch 19 RSVA 3 Installation Instructions 5 Install the RSVA 3 in the Panel 5 Install the RSVA 3 in the Panel The RSVA 3 requires a 1 x 1 square mounting hole Install the RSVA 3 switch from behind the instru ment panel using the screws and nuts provided in the RSVA 3 kit 6 Ground Test RSV A 3 in the Battery Position With the master on and the
12. ccurs turn off any unnecessary electrical equipment The lower you can get the discharging current the longer the battery will last The VA 1A will display trend information when your battery is in a discharging condition As you watch the battery discharging 1 volts at a time it becomes relatively easy to judge the remaining time you have before the battery reaches a seriously low condition As the battery voltage approaches 11 volts 22 volts for a 24 volt system the aircraft s electrical equipment will start to malfunction The exact voltage at which each piece of equipment will start to malfunction depends on the design of that equipment The VA 1A will work accurately from 40 to 7 volts far below where most electrical equipment starts to fail VA 1A Installed in the Alternator Lead Two common methods of installing the VA 1A or VA 1A XX in the electrical system of your aircraft are in the battery lead and in the alternator lead Following are the operating characteristics of the VA 1A installed in the alternator lead 1 Master On Engine Off The following describes the operating characteristics of the VA 1A installed in the alternator lead with the master switch on and the engine off With the Mode Switch in the Amps position the VA 1A will display 000 a few counts Since the battery 1s supplying all of the electrical load and the alternator is off not turning there is no current being supplied from the alternator and t
13. e Starter Solenoid In that case it should be rerouted to the Bus or side of the Shunt Starter Solenoid To Start cree VA 1A or External Shunt v e0 0 0 0000000000000000000 This is the main lead going to the Bus e It may come from the Master Switch e e Contactor or the Starter Solenoid v ee0 0000000000000000000909 Note The VA 1A or External Shunt should not be installed in series with the starting current 10 Installation Instructions 3 Determine how the VA Unit will be installed Figure 2 VA 1A or External Shunt Installed in the Alterntor Lead 0e0 0 000000000000000000000909 This line may be connected to the Bus e e e Master Switch Contactor or the Starter e e Solenoid veoe e0006000000009 veeoec 0 06060000 e e e e Alternator M e V A 1A or External Shunt Reverse Current Diode Some aircraft do not have this diode e ececc 0c060000000000000 e Note The VA 1A or shunt may e be installed before or after any reverse current diode Although e it is preferred to install it after the reverse current diode as shown v ec 0 0 0 0600600000000000099 9 Master Switch Contactor To Starter 0e 0 00000000000000000000909 This is the main lead going to the Bus e t may come from the Master Switch Starter Solenoid Contactor or the Starter Solenoid ee0 00000000000000000000 9 11
14. eration Resolution VA 1A and VA 1A XX 60 amps and below resolve amperage to 1 amps VA 1A XX above 60 amps resolves amperage to 1 amps All units resolve voltage to 1 volts Accuracy 1 of reading plus or minus one count Amps and Volts Discharge Warning Light For a 12 volt system the light will be on for bus voltages below 12 8 volts 2 volts For a 24 volt system the light will be on for bus voltages below 25 6 volts 4 volts The signal is sensed off the red lead High Volts Light For a 12 volt system the light will be on for bus voltages above 15 4 volts 3 volts Fora 24 volt system the light will be on for bus voltages above 30 8 volts 6 volts The signal is sensed off the red lead 12 24 Volt Select Switch A select switch is available on the back of the unit to configure the unit for a 12 or 24 volt electrical system VA 1A Configuration Contains an internal shunt for measuring currents to 100 amps and voltages to 40 volts VA 1A XX Configuration This unit must be matched to the aircraft s external shunt i e 100 amp 50 mV external shunt must use a VA 1A 100 23
15. g the aircraft Do not allow anyone to operate the aircraft that does not know the operation of this product Keep the Operating Manual in the aircraft at all times 6 E I Inc is not responsible for shipping charges or damages incurred under this Warranty 7 No representative is authorized to assume any other liability for Electronics International Inc in connection with the sale of Electronics International Inc products 8 If you do not agree to and accept the terms of this warranty you may return the product for a refund This Warranty is made only to the original user THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES OR OBLIGATIONS EXPRESS OR IMPLIED MANUFACTURER EXPRESSLY DISCLAIMS ALL IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE PURCHASER AGREES THAT IN NO EVENT SHALL MANUFAC TURER BE LIABLE FOR SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES IN CLUDING LOST PROFITS OR LOSS OF USE OR OTHER ECONOMIC LOSS EXCEPT AS EXPRESSLY PROVIDED HEREIN MANUFACTURER DISCLAIMS ALL OTHER LIABILITY TO PURCHASER OR ANY OTHER PERSON IN CONNECTION WITH THE USE OR PERFOR MANCE OF MANUFACTURER S PRODUCTS INCLUDING SPECIFICALLY LIABILITY IN TORT VA 1A VA 1A XX eee Operating Instructions OI 041032 Rev C 7 13 92 Features 1 12 24 Volt Select Switch On the back of the VA 1A is a select switch to set the High Volts and Discharge warning features for a 12 or 24 volt system see Installation Instr
16. ge lugs on the back of the VA 1 unit If any major current carrying wire is extended you must use the same size wire as the original See the appropriate wiring diagram in this manual for your installation Route the Optional External Warning Control Line The white yellow wire can be connected to an external light AL 1 buzzer ATG 1 a relay etc This wire grounds when the Discharge High Volts Warning Light is on The current in this line must be limited to 2 10 of an amp maximum Exceeding this limit will damage the unit If this feature is not used leave this line open Tie wrap this wire so it does not obstruct the freedom of travel of any controls Install the Instrument in the Panel Install the instrument from behind the instrument panel using 6 x 32 screws These screws should not be any longer than 1 2 Connect the Circular Connector to the Instrument 1 Push the two mating connectors together and twist them until they snap into position 2 Turn the locking ring on the instrument connector clockwise 1 1 2 turns until it locks into position 13 Installation Instructions 12 Ground Test 13 Ground Test VA 1A Installed in the Battery Lead With the master on and the engine off the discharge light should be on the Volts position will read 11 9 to 12 5 volts 23 8 to 25 volts for a 24 volt system and the Amps position should read 2 0 to 10 0 amps depending on your current load for the aircraft Chan
17. ge the battery and most of your electrical equipment If the aircraft bus voltage goes to a dangerously high level 15 3 volts or higher a bright red High Volts light on the VA 1A will warn you of this condition If this happens turn the field to the alternator off to eliminate the over voltage condition Another common electrical problem is a discharging condition If this condition goes unnoticed which it normally does you will end up with a dead battery in flight rendering all of your electrical equipment useless To help you avoid this situation the VA 1A has a Discharge Warning Light which acts as an early warning to alert you as soon as the battery goes into a discharging condition If this situation occurs turn off any unnecessary electrical equipment The lower you can get the discharging current the longer the battery will last With the VA 1A installed in the alternator lead discharging current cannot be monitored The VA 1A will display trend information when your battery is in a discharging condition As you watch the battery discharging 1 volts at a time it becomes relatively easy to judge the remaining time you have before the battery reaches a seriously low condition As the battery voltage approaches 11 volts 22 volts for a 24 volt system the aircraft s electrical equipment will start to malfunction The exact voltage at which each piece of equipment will start to malfunction depends on the design of that equipment The V
18. ging the load will change the amps reading With the master on and the engine on all lights will be off the Volts position will read 13 2 to 14 8 volts 26 4 to 29 6 for a 24 volt system and the Amps position will read 5 0 to 15 0 amps and reducing rapidly shows battery charging current Changing the load will not change the amps reading See the operating section of this manual for further details VA 1A Installed in the Alternator Lead With the master on and the engine off the discharging light will be on the Volts position will read 11 9 to 12 5 volts 23 8 to 25 volts for a 24 volt system and the Amps position should read 0 0 amps 2 amps Changing the load will not change the amps reading With the master on and the engine on all lights will be off the Volts position will read 13 2 to 14 8 volts 26 4 to 29 6 for a 24 volt system and the Amps position will read 5 0 to 25 0 amps and reducing rapidly shows battery charging current plus load current for the aircraft Changing the load will change the amps reading See the operating section of this manual for further details Troubleshooting If your VA 1A or VA 1A XX has a problem perform the following troubleshooting suggestions in the order listed below 1 Volts Read Incorrectly Connect only the red and black lead all other leads must be open The unit must read correct voltage on the Red lead Check for poor connections on the red and black lead You may have a prob
19. he Discharge warning light will be on With the mode select switch in the Volts position the VA 1A will display the bus voltage to 1 volts With all electrical equipment off and a fully charged battery the bus voltage will be around 12 1 to 12 5 volts double these levels for a 24 volt system Each battery has its own operating voltage when charged As the battery gets near the end of its life this voltage will start to drop A discharged battery will also run at a lower voltage Don t confuse a good discharged battery with an old battery 2 Master On Engine On The following describes the operating characteristics of the VA 1A installed in the alternator lead with the master switch on and the engine on Operating Instructions VA 1A Installed in the Alternator Lead With the Mode Switch in the Amps position the VA 1A will display the electrical system load on the aircraft plus the battery charging current Since the engine is on all of the current is being supplied by the alternator The VA 1A will show a charging condition the Discharge light will be off and display an accurate reading of the total current drain from the alternator In this mode of operation any piece of electri cal equipment can be checked for proper operation during flight by performing the following steps A Note the amps reading on the VA unit B Turn off the piece of electrical equipment you wish to check C If this piece of electr
20. ical equipment is working properly you will see a decrease in load current that corresponds to the current that piece of equipment requires Compare this current with the current you measured for that same piece of equipment at an earlier date Using this method with the digital display of the VA 1A many important aircraft functions strobes retracts radios transponder ADFs DMES pitot heat etc can be checked from the pilot s seat It would be worth while to write down the load current for the entire system and for each piece of equipment This would give you something to compare to when you wish to check for proper operation at a later date You may also check the entire electrical system with one check by turning all the electrical equipment on and comparing this reading with your normal reading taken at an earlier date If an improper reading is noted the VA 1A may then be used to diagnose which piece of equipment has malfunctioned by checking each piece of equipment separately With the mode selector switch in the Volts position the VA 1A will display the bus voltage to 1 volts With the engine running the alternator is capable of raising the bus voltage to a dangerously high level It is the voltage regulator s job to limit the bus voltage between 13 5 and 14 8 volts double these levels for a 24 volt system Look for this level on the VA 1A A low voltage reading will cause the battery to charge very slowly A high reading can dama
21. in high ambient light or direct sunlight Voltage will be displayed in 1 volt increments and a V annunciator will show in the display Amperage will be displayed in 1 amp increments for the VA 1A and any external shunted unit 60 amps and below i e VA 1A 60 and below For any external shunted unit above 60 amps VA 1A 70 and above amperage will be displayed in 1 amp increments Any time the Mode Switch is in the Amps position an A annunciator will show in the display Note When the VA 1A XX is mounted in the alternator lead and the engine is off the VA 1 A XX may display up to 3 amps This is due to any leakage current in the alternator and any offset in the VA 1A XX 5 Mode Switch The Mode Switch sets the display between Volts and Amps The setting of this switch will not affect the operation of the High Volts or Discharge warning lights VA 1A Installed in the Battery Lead The two common methods of installing the VA 1A or VA 1A XX in the electrical system of your aircraft are in the battery lead and in the alternator lead Following are the operating characteristics of the VA 1A installed in the battery lead 1 Master On Engine Off The following describes the operating characteristics of the VA 1A installed in the battery lead with the master switch on and the engine off With the Mode Switch in the Amps position the VA 1A will display the electrical system load on the
22. ire harness to the aircraft s 12 or 24 volt main or emergency bus as applicable via an independent circuit breaker one to two amps An alternate method would be to route the red lead to the bus via a one amp in line fuse With this method a spare fuse should be kept in the aircraft See the Wiring Diagram at the back of this manual Route the black wire in the wire harness to a good ground Tie wrap these wires so they do not ob struct the freedom of travel of any controls 7 Route the Backlight Wires Fora 12 Volt system connect the White Brown to the 12 Volt bus Connect the White Red wire to ground For a 24 Volt system connect the White Red wire to the 24 Volt bus Leave the White Brown wire open 12 Installation Instructions 8 Route the Shunt Wires 8 Route the Shunt Wires External Shunt Unit Only VA 1A XX 10 11 12 Route the orange wire to the side of the shunt via a one amp fuse See the appropriate wiring diagram in this manual for your installation Connect the brown wire to the side of the shunt via a one amp fuse If you are replacing an existing unit most of the wires and all of the fuses should already be in place If this unit is to be used with an RSVA 3 remote switch see the RSVA 3 Installation section of this manual Connect the Large Shunt Wires Internal Shunt Unit Only VA 1A Connect the large bus battery or alternator leads as appropriate for your installation to the lar
23. is started E Check that the instrument make and model marked on the side of the instrument and on the invoice are correct before starting the installation The S 50 Shunt is marked 100MV and 100 AMP The S 300 Shunt is marked 50M V and 300 AMP F Before starting the installation make sure the unit will fit in the location you intend to install it without obstructing the operation of any controls G Ifthis instrument is to replace an existing unit in the aircraft it is the installer s responsibility to move or replace any existing instruments or components in accordance with FAA approved methods and proce dures 2 Instrument Set Up On the back of the VA 1A is a hole allowing access to a small switch The switch furthest to the right in this window sets the VA 1A for a 12 or 24 volt system The other switches have no affect on the operation of the VA 1A If you have a 12 volt system set this switch down If you have a 24 volt system set this switch up oo Q c Switch Access Hole Switch Up 24V Switch Down 12V Om Internal Shunt VA 1A only VA 1A Back Panel 3 Determine how the VA Unit will be installed in your aircraft s electrical system Obtain an electrical diagram of your aircraft s alternator starter system from the service manual There are two common ways an ammeter is installed in an aircraft One method is with the ammeter in the generator or alternator lead The other method is w
24. ith the ammeter in the battery lead The VA 1A or VA 1A XX may be installed using either method The advantages and disadvantages of each method are listed below Installation Method Advantages Disadvantages Battery Lead 1 Shows load current on the 1 Cannot show load current durring ground engine off and durring flight or when the engine is running an alternator failure 2 All Warning Lights are operational Alternator Lead 1 Shows load current durring l Cannot show load current when flight or when the engine is the engine is off or durring running analternator failure 2 All Warning Lights are operational Installation Instructions 3 Determine how the VA Unit will be installed With the improvements made to the VA 1A there are few disadvantages using either method Although EI s test pilot has a slight preference for the alternator lead when using the VA 1A ease of installation should be the determining factor In most cases installing the VA 1A is a simple matter of replacing your existing unit and adding a few wires see Wiring Diagram Following is a typical diagram of each installation Determine how the VA 1A or External Shunt will be installed in your aircraft Figure 1 VA 1A or External Shunt Installed in the Battery Lead Alternator To Voltage Regulator Master Switch Contactor O O eve0e0000000000000000000000090 This line may be connected currently to the Master Switch Contactor or th
25. lem with the unit 2 Amps Read Incorrectly A Check that the red and black leads have good connections B Fora VA 1A internal shunt unit connect only one of the shunt leads on the back of the unit to the bus The other lead should be open The unit must read 00 0 3 Amps C Fora VA 1A XX external shunt unit connect both shunt leads orange and brown to the bus or one side of the shunt The unit must read 00 0 3 Amps A poor connection in the orange or brown lead 14 Troubleshooting will cause only the Amps reading to wander around Check for poor connections pull on each wire at the back of its connector Check the fuses and fuse holders Check that the signal shunt leads do not supply power to any other piece of equipment 3 Discharge Warning Light Works Incorrectly Check that the 12 24 Volt Select Switch on the back of the unit is set properly The Discharge Warning Light will be on when the bus voltage on the Red wire drops below 12 6 volts 25 2 volts for a 24 volt system 4 High Volts Warning Light Works Incorrectly Check that the 12 24 Volt Select Switch on the back of the unit is set properly The High Volts Warning Light will be on when the bus voltage on the Red wire exceeds 15 3 volts 30 6 volts for a 24 volt system 5 Back Light Works Incorrectly On a 12 volt system the 24 volt line must be grounded See the Wiring Diagram Check for poor connec tion on the backlight wire
26. ng taken at an earlier date If an improper reading is noted the VA 1A may then be used to diagnose which piece of equipment has malfunctioned by checking each piece of equipment separately With the mode select switch in the Volts position the VA 1A will display the bus voltage to 1 volts With all electrical equipment off and a fully charged battery the bus voltage will be around 12 1 to 12 5 volts double these levels for a 24 volt system Each battery has its own operating voltage when charged As the battery gets near the end of its life this voltage will start to drop A discharged battery will also run at a lower voltage Don t confuse a good discharged battery with an old battery 2 Master On Engine On The following describes the operating characteristics of the VA 1A installed in the battery lead with the master switch on and the engine on With the Mode Switch in the Amps position the VA 1A will display the charging current to the battery When the engine is first started the current will jump up to 20 amps or more and will quickly decrease as the battery takes a charge Within a few minutes the charging current will have dropped to 6 amps or lower and will continue to drop for the next hour until it settles to 1 0 amps or lower With the VA 1A installed in the battery lead load current cannot be monitored during flight The Alternator or generator is supplying all of the electrical load and charging the battery
27. o toten xus eret I A mM ae ce 9 1 Important Information and Initial Check Out oiiisssonicmnn senunni eene nennen 9 2 eInstrument Set Up oie eee etate celavit ineo EE Ere ERE QN ES EAN EENE RM UAR R EX EE NUR E QUSE E RC DEDE SENSE RARUS 9 3 Determine how the VA Unit will be installed in your aircraft s electrical system sss 9 4 Install the External Shunt External Shunt Unit Only VA 1A XX ssssssssseeeeeeenee 12 5 Route the Circular Connectors eeeeseessseee eee e eeeeenetn ner eenehe ette e enin e teen se se eese teres seen 12 6 Route the Power and Ground Wires wc ccceccesscccceseessscecceececsescesccsceceaeeesesecesesssasseseeseesensssseeseeeees 12 Te Route the Backlipht WIres i221 arro re rro re E Er vo ed eie er rete ri Len ap eu eg 12 8 Route the Shunt Wires External Shunt Unit Only VA 1A XX sssseseeeeeeeeeene nee 13 9 Connect the Large Shunt Wires Internal Shunt Unit Only VA 1A esses 13 10 Install the Instrument in the Panel sees eene nenne eeneerne enne eene tnr ener einen 13 11 Connect the Circular Connector to the Instrument ssseeee eee eee eene en nnn 13 PAM GIC I BIER UNT 13 Tro ubleshoDUnDp uoo oii Desmar oic eno spin oce pas ruta trus iE gs aa laara Ec usc bat Sannar sesia 14 VA 1A Internal Shunt Unit Wiring Diagram cccsscssssssssecssecssscsseeeseeeesecesneeens 16 VA 1A XX External Shunt Unit Wiring Diagram
28. provided the item is returned to the factory prepaid 1 This Warranty shall not apply to any product that has been repaired or altered by any person other than Electronics International Inc or that has been subjected to misuse accident incorrect wiring negligence improper or unprofessional assembly or improper installation by any person This warranty does not cover any reimbursement for any person s time for installation removal assembly or repair Electronics International retains the right to determine the reason or cause for warranty repair 2 This warranty does not extend to any machine vehicle boat aircraft or any other device to which the Electronics International Inc product may be connected attached interconnected or used in conjunction with in any way 3 The obligation assumed by Electronics International Inc under this warranty is limited to repair replacement or refund of the product at the sole discretion of Electronics International Inc 4 Electronics International Inc is not liable for expenses incurred by the customer or installer due to factory updates modifications improvements upgrades changes or any other alterations to the product that may affect the form fit function or operation of the product 5 Personal injury or property damage do to misinterpretation or lack of understanding this product is solely the pilots responsibility The pilot must understand the operation of this product before flyin
29. s white brown and white red 6 Bench Test the Instrument To bench test the VA 1A or the VA 1A XX connect one lead of the internal shunt or both the orange and brown leads for the VA 1A XX to the red lead and connect all of them to a power supply 7 to 40 volts Connect the black lead to ground The unit must read 00 0 3 Amps and proper voltage 15 VA 1A Internal Shunt Unit Wiring Diagram W0225921 12 24 Volt Switch Up for 24 Volt system Down for 12 Volt system 9 Oro VA 1A Back Panel 4 Wire or larger 4 Wire or larger mi Circular Connector Red To Bus via 1 to 2 Amp Fuse Black To Ground D E g WW brite Aii To 12 Volt Bus open for 24 volt system 12 Volt Back Light White Red To 24 Volt Bus ground for 12 volt system 24 Volt Back Light White Yel To External Warning Light pulls low when the Discharge or High Volts Light is on 16 VA 1A XX External Shunt Unit Wiring Diagram W0225922 12 24 Volt Switch Up for 24 Volt system Down for 12 Volt system O OO VA 1A XX Back Panel Circular Connector Red To Bus via 1 to 2 Amp Fuse Black To Ground 2 WEE To 12 Volt Bus open for 24 volt E system 12 Volt Back Light m White Red p To 24 Volt Bus grounded for 12 volt system 24 Volt Back Light a Denes To side of Shunt 6 B _ To side of Sh
30. uctions 2 High Volts Warning Light If the bus voltage rises to 15 3 volts 30 6 volts for a 24 volt system or higher a bright red High Volts warning light will alert you of this condition The high volts feature is sensed off the red power lead and will function regardless of installation variations or what position the mode switch is in If this light is on an External Warning Line will be pulled low which can be used to activate an External Warning Light 3 Discharge Warning Light If the bus voltage drops below 12 6 volts 25 2 volts for a 24 volt system a bright yellow Discharge warning light will alert you of this condition The discharge warning feature is sensed off the red power lead and will function regardless of installation variations or what position the mode switch is in If this light is on an External Warning Line will be pulled low which can be used to activate an External Warning Light High Volts Warning Light Discharge Warning Light HIGH VOLTS DISCHARGE 12 24 Volt Select Switch on back Digital Display ELECTRONICS INTERNATIONAL VOLTS AMPS fos No Mode Switch Operating Instructions Features 4 Digital Display The VA 1A comes with 12 and 24 volt digital display back light controllines The digital display should be backlit all the time This will allow it to be viewed easily in dim light The digital display is best viewed
31. unt White Yel To External Warning Light pulls low when the Discharge or High Volts Light is on 17 VA 1A and VA 1A XX Circular Connector Wire Harness Connector Back View wire side OR Instrument Connector Front View Note See Wiring Diagram for hook up information VA 1A XX External Shunt Unit Only 18 RSVA 3 Installation Instructions 7 13 92 The RSVA 3 switch is used in conjunction with a VA 1A XX external shunt unit in a twin engine aircraft to monitor both alternator outputs and the battery charging and discharging currents 1 Install the External Shunts Note If you are replacing an existing ammeter the shunts may already be mounted in the aircraft If this is the case you should have ordered a VA 1A XX unit that matches your existing shunts The external shunts should be installed in an appropriate location that minimizes the routing of main cables refer to the wiring diagram at the end of this section Also they should be mounted in a location where inadvertent damage cannot occur If the shunts can be accessed easily they should be covered When mounting the shunts use self locking or wired nuts 2 Install the VA 1A XX Instrument Install the VA 1A XX in the aircraft as described in the VA 1A VA 1A XX Installation Instruction section of this manual 3 Route the Shunt Wires Route a 18 to 20 ga wire from the and terminals of each shunt to the RSVA 3 switch mounting loc
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