B&C LR3D-14 Technical Manual Download Page 1 | Manualshive

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Technical Manual

for

Model No. LR3D-14 and LR3D-28

Linear Regulator

With Over-Voltage Protection, Low-Voltage Sensing,

And Field-Adjustable Charging Voltage

Including:

Installation Instructions;

Troubleshooting Guide; and

Instructions for Continued Airworthiness

B & C Specialty Products

P.O. Box B

Newton, KS 67114

(316) 283-8000

bandc.com

LR3D-TM, Rev. IR (5/13/2020)

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Summary of Contents for LR3D-14

Page 1: ... Voltage Protection Low Voltage Sensing And Field Adjustable Charging Voltage Including Installation Instructions Troubleshooting Guide and Instructions for Continued Airworthiness B C Specialty Products P O Box B Newton KS 67114 316 283 8000 bandc com LR3D TM Rev IR 5 13 2020 ...

Page 2: ...ndc com INDEX Name INTRODUCTION INSTALLATION OPERATION TROUBLESHOOTING WIRING DIAGRAM INSTRUCTIONS FOR CONTINUED AIRWORTHINESS Section A B C D E F NOTE The LR3D 14 and LR3D 28 Linear Regulators are not STC d or PMA d and are intended for installation in amateur built aircraft only ...

Page 3: ...s dependent on battery temperature some operators may desire a higher charging voltage during winter operations and a lower charging voltage during summer operations While this can be accomplished by manually adjusting the voltage regulator the intent of this feature is to make the adjustment occur automatically from one season to the next In practice the vast majority of installations do not see ...

Page 4: ...ithin the LR3D Do NOT connect aircraft bus voltage directly to terminal 5 and do NOT use a plain LED without a current limiting resistor Terminal 6 This input is connected to the aircraft bus by means of a 5A circuit breaker and an alternator switch Field current is sourced from this input voltage sense for OV protection is also provided from this input If the crowbar OV circuit is triggered due t...

Page 5: ... to drop off line The alternator will remain off line until power is restored to the circuit by manually closing the 5A circuit breaker The LV warning light will begin to flash when the voltage sensed at terminal 3 drops to approximately 12 7V and below LR3D 14 or 25V and below LR3D 28 The warning light will cease flashing if when the sensed voltage rises above these thresholds PARTS LIST The foll...

Page 6: ... part of an installation kit P N LR INSTALL from B C Specialty Products bandc com phone 316 283 8000 CHANGE IN WEIGHT AND BALANCE The LR3D Controller weighs a nominal 0 6 lbs Variations in airframe station references for all aircraft affected by this kit preclude including pre calculated weight and balance data in this manual Weight of electrical accessories and hardware will vary for each individ...

Page 7: ...irst Step 2 Refer to applicable service manual instruction remove existing regulator Step 3 Select a suitable location to mount the LR3D Mounting on the pilot s side of the firewall or inside the cabin near the panel terminal strip down is preferred linear controllers are electrically quiet and create little or no noise when properly installed and grounded NOTE Take care to choose a mounting locat...

Page 8: ...the LR3D sense and field supply circuits using M22759 16 Tefzel wire and the supplied S814R6 ring terminals according to the wiring diagram on page E 1 Step 9 Wire the LR3D to ground using M22759 16 Tefzel wire and the supplied S814R6 ring terminals according to the wiring diagram on page E 1 Be certain to establish ground connections to both terminal 7 and the threaded ground stud located below t...

Page 9: ...thus confirming the function of the OV protection circuit Failure of the field breaker to open is cause for investigation C System charging start the engine according to normal procedure With the engine running and the battery master switch ON turn the alternator field switch ON An increase in bus voltage to 14 to 14 4 volts or 28 to 28 8 volts should be observed depending on the electrical load e...

Page 10: ...ound on many aircraft these can be a common source of reliability woes as they accumulate time in service Select KLIXON or Mechanical Products circuit breakers both of which are widely used in general aviation These well constructed single purpose devices are reasonably economical and will serve you well over time Avoid combination switch circuit breakers another common source of reliability issue...

Page 11: ...ome active when bus voltage drops below the factory set LV threshold see Section A System Function Indication will be in the form of a flashing warning light if the supplied indicator has been used in your installation This warning indication will persist until the LV condition ceases Over Voltage OV protection and warning indication will become active when bus voltage rises above the factory set ...

Page 12: ...as the source for pin 3 that supplies another device of considerable load Change to a breaker dedicated to pin 3 It is recommended that pin 3 NOT be jumpered to pin 6 If pin 3 has no voltage the regulator will not operate and low voltage warning will be lost Bus voltage _______ volts Pin 3 voltage ________volts 3 Measure the voltage on pin 6 of the regulator It should be within 0 5 volts of the bu...

Page 13: ... connector removed and a resistance measurement made between the connector and pin 4 of the regulator Look for near 0 Ohms Field resistance of the alternator may also be checked at this time by measuring from either male field terminal blade to alternator case typically this should measure between 3 and 10 Ohms Values other than these may indicate a broken field wire or heavily worn alternator bru...

Page 14: ...of shield continuity with an ohmmeter may prove illuminating Wire routing is important Separate noise carrying conductors like P leads from other wiring Avoid running noisy wiring parallel to other wiring in the same bundle Stop the noise at its source Once the noise is loose it can be difficult to filter it out of all affected systems Try to locate the offending item and correct the problem at th...

Page 15: ...LR3D Technical Manual Section E Rev IR 5 13 2020 Wiring Diagram B C Specialty Products Page E 1 bandc com ...

Page 16: ...minals and M22759 16 Tefzel wire for repairs to the LR3D connecting harness All repairs to the LR3D are by factory service or replacement only Field adjustment of the regulated voltage may be accomplished by accessing the precision adjustment potentiometer located under the round black cap on the side of the LR3D enclosure A small flat blade screwdriver may be used for the adjustment clockwise rot...

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