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LR3D Technical Manual
Rev. IR (5/13/2020)
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).
Use a handheld digital voltmeter at the battery to confirm any field adjustment.
The pre-set charging voltage of the LR3D should be suitable for most
12V & 24V Sealed Lead Acid (SLA) batteries. Electrical systems
using legacy "Flooded" batteries, or Lithium (LiFePO
batteries, may require field adjustment. Consult the documentation
provided by the manufacturer to ensure adequate battery performance
In normal operation the Low-Voltage (LV) warning light will not be illuminated. The light may
flash in response to low engine RPM and high bus load, however; or it may flash to indicate an
emerging problem in the charging system.
The integrated Over-Voltage (OV) protection is set at a non-adjustable 16.25V (± 0.25V) on the
LR3D-14, and 32.5V (± 0.5V) on the LR3D-28. When triggered, this protective response will
cause the 5A field supply circuit breaker to open, thereby depriving the alternator of excitation
voltage and causing it 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.
The following parts are supplied with the LR3D-14 and LR3D-28:
Qty.
Part No.
1
LR3D-14 or LR3D-28
8
S814R6
1
S888-1-4 (14v) or S888-2-4 (28v)
The following parts may be needed but are not supplied:
Qty.
Part No.
1
L-40, LX60, BC410-H, BC462-H (or equal)
1
CB2
1
CB5
1
S700-2-3
B&C Specialty Products
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NOTE
and service life.
PARTS LIST
or similar)
4
Description
Alternator Controller (Regulator)
Terminal, Ring, 18-22AWG
Warning Lamp, Yellow
Description
Alternator
Circuit Breaker, 2A
Circuit Breaker, 5A
Switch, Toggle
Section A
Introduction
Page A - 3
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