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LR3D Technical Manual
Rev. IR (5/13/2020)
Turn ON battery/alternator master switch(s). Perform a normal engine start. Proceed with other
pre-flight procedures. Note: there is no significant difference between turning the alternator ON
before or after engine start.
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.
Low-Voltage (LV) warning indication will become 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 OV threshold (see Section A, "System Function"). The LR3D will
shut down the charging system, followed shortly thereafter by LV warning indication as the bus
voltage drops below the LV threshold in response to continuing loads. Indication will again be
in the form of a flashing warning light, this time in conjunction with an open 5A field supply
circuit breaker. While a manual reset of this 5A circuit breaker may be attempted, should the
OV condition continue the protective OV response will persist, keeping the charging system off-
line until the root condition is corrected.
Perform a normal engine shutdown. Turn OFF battery/alternator master switch.
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OPERATION OF THE LR3D
Start-Up
In-Flight
Shutdown
Section C
Operation
Page C - 1
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