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LR3D Technical Manual
Rev. IR (5/13/2020)
If panel space is limited, a 2A in-line fuse may be substituted for the
2A circuit breaker associated with terminal #5. The 5A circuit breaker
associated with terminal #6 MUST be used. Connecting terminal #6
directly to the bus or using PTC thermistors (sometimes called "solid-
state breakers") will damage the LR3D if there is an OV condition.
Step 11. Wire the S888-1-4 warning light (or alternate indicator) using M22759/16 Tefzel wire,
according to the wiring diagram on page E-1. Place heatshrink (supplied) over each
wire for the warning light base, solder the wires onto the base terminals, and shrink the
heatshrink over the connection.
Step 12. Connect ship's battery, Negative (-) terminal last, and replace engine cowl.
Step 13. Test the installation as follows —
A. Low-voltage indication: turn the battery master switch ON, and observe the
warning light. Depending on the condition of the battery, this light may or may
not flash. 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).
B. Over-voltage protection: with the battery master switch ON, turn the alternator
field switch ON. Touch a jumper wire momentarily between terminal #2 and
terminal #6; this should cause the 5A field circuit breaker to open (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, engine RPM, and type of alternator
(refer to the supporting documents for the alternator to determine the RPM at
which measurable output may be expected). The low-voltage warning light
should no longer flash.
Step 14. Update ship's weight and balance, pilot operating handbook and maintenance records.
1.
Avoid deviating from the installation instructions and wiring diagram. The LR3D has been
designed to integrate into your aircraft electrical system in a specific way, with separate bus
connections for "sense" and "control". Similarly, the LR3D also requires other associated
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NOTE
Tips for a Successful Installation
Section B
Installation
Page B - 3
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