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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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Table of Contents
Related Manuals for B&C LR3D-14
Summary of Contents for B&C LR3D-14
- Page 1 Technical Manual 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...
- Page 2 INDEX Name Section INTRODUCTION INSTALLATION OPERATION TROUBLESHOOTING WIRING DIAGRAM INSTRUCTIONS FOR CONTINUED AIRWORTHINESS 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. B&C Specialty Products Page i bandc.com...
- Page 3 LR3D Technical Manual Section A Rev. IR (5/13/2020) Introduction INTRODUCTION The LR3D is an external alternator controller (regulator) designed for use with B-type, wound- field alternators. Over-voltage (OV) protection, Low-Voltage (LV) warning output, and field- adjustable charging voltage are integrated into the LR3D control package. OVERVIEW 1 - Battery Temp input (optional) 5 - Low-Voltage Warning output...
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Page 4: System Function
LR3D Technical Manual Section A Rev. IR (5/13/2020) Introduction Terminal 3 - This input is used by the LR3D to accurately sense the bus voltage for the purpose of voltage regulation and low voltage warning. If no bus voltage is provided to this input, the regulator will not operate. -
Page 5: Parts List
Rev. IR (5/13/2020) Introduction turn of the potentiometer will adjust the voltage by approximately 0.2V on the LR3D-14 and 0.4V on the LR3D-28 (clockwise to increase, counterclockwise to decrease). The available range of adjustment is approximately 11.0V-16.0V (LR3D-14) and 22.0V-32.0V (LR3D-28). - Page 6 LR3D Technical Manual Section A Rev. IR (5/13/2020) Introduction M22759/16-18-9 Wire, 18 AWG, White, Tefzel M22759/16-22-9 Wire, 22 AWG, White, Tefzel AN4-4A Bolt AN960-416L Flat washer AN365-428A Locking nut The above items are available individually, or as part of an installation kit (P/N: LR-INSTALL), from B&C Specialty Products, bandc.com, phone: 316-283-8000.
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Page 7: Installation
LR3D Technical Manual Section B Rev. IR (5/13/2020) Installation INSTALLATION Preparation Step 1. Refer to applicable service manual instructions; remove and retain engine cowl. Disconnect ship’s battery, Negative (-) terminal first. Step 2. Refer to applicable service manual instruction; remove existing regulator. Step 3. - Page 8 LR3D Technical Manual Section B Rev. IR (5/13/2020) Installation Step 4. Select a suitable location to mount the low voltage warning light in your instrument panel. An incandescent light has been included with the LR3D; however, an LED indicator (user supplied) may be substituted, if desired. The warning light should be positioned within the pilots' peripheral vision —...
- Page 9 If it does not begin flashing, turn on the landing light or the nav lights to lower the battery voltage sufficiently to make the warning light start to flash (typically between 12.5 and 13.0 volts on LR3D-14; or 24.5 and 25.5 volts on LR3D-28).
- Page 10 LR3D Technical Manual Section B Rev. IR (5/13/2020) Installation components, such as circuit breakers and an alternator field switch, which meet certain specifications. These connections and associated components are vital to proper system function. Use time-proven components in your installation. Our technical staff has found that a reliable installation is often made or broken by the associated parts used to install the LR3D.
- Page 11 In-Flight Bus voltage in flight will normally be maintained between 14.0V and 14.4V with the LR3D-14, or between 28.0V and 28.8V with the LR3D-28, unless the regulation set-points have been re- adjusted in the field. Bus voltage below these set-points can also be present if bus load exceeds alternator capacity, if excessive voltage drop exists in the regulator wiring or associated components, or if there has been a failure at some point in the charging system.
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Page 12: Troubleshooting
LR3D Technical Manual Section D Rev. IR (5/13/2020) Troubleshooting TROUBLESHOOTING Refer to the wiring diagram found on page E-1 and use a high impedance (preferably digital) volt/ohmmeter (DVM) to make the following checks. Please note that the engine should not be running, the mags should be OFF, and there should be no auxiliary power applied to the aircraft electrical system. - Page 13 LR3D Technical Manual Section D Rev. IR (5/13/2020) Troubleshooting L-40, BC410-H, and BC425-H Alternators: Use a thin probe or small gage wire wrapped around the probe to reach through the connector body and measure the voltage at either field connector terminal coming out of the alternator.
- Page 14 LR3D Technical Manual Section D Rev. IR (5/13/2020) Troubleshooting • Correct (or prevent) noise problems by using a unitized grounding system, such as a “ground block.” This averts small voltage differences between different ground points — a common source of electrical noise (and erratic behavior in associated devices). •...
- Page 15 LR3D Technical Manual Section E Rev. IR (5/13/2020) Wiring Diagram B&C Specialty Products Page E - 1 bandc.com...
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Page 16: Instructions For Continued Airworthiness
A small flat-blade screwdriver may be used for the adjustment; clockwise rotation increases the set voltage at a rate of 0.2V per full turn (LR3D-14) or 0.4V per full turn (LR3C-28). The integrated Over-Voltage (OV) protection function is set at a non-adjustable 16.25V (±...