Sandia Aerospace SA 3NVG - Manual (Page 15)

3.3 Interconnect Wiring
The SA 3 & 3L Regulator/ Dimming Modules provide a source of power to drive up to .5
amps of continuous current for aircraft annunciators. The SA 3 & 3L will provide 1 amp
short term for testing of annunciators. Aircraft power is supplied to 7 pins for installation
flexibility. Two adjustments allow setting the High and Low intensity of the annunciators to
match existing aircraft annunciators.
Pin 2 on the SA 3 & 3L is the keying pin and has been removed at the factory. A plug which
is supplied with the installation kit must be inserted into Pin 2 of the mating connector.
The SA 3 is for use with incandesent lamps while the SA 3L is for use with LED Lamps.
See figure 3-4 for a schematic and pinout of the SA 3 & 3L
3.3.3 SA 15 Inverter Module
The SA 15 module allows equipment with +5Vdc or +28Vdc lamp outputs to drive panel
annunciator lamps that require grounded inputs. The SA 15 inverts up to 14 high level lamp-
driver inputs providing independent low outputs for each line. The 14 inverters are arranged
in two banks of 7 inverters for installation flexibility. A single line on each inverter bank
allows simultaneous testing of all 7 outputs. The inverters may also be cascaded, providing
consistent drive polarity and simplifying press to test wiring of panel annunciators.
Pin 36 on the SA 15 is the keying pin and has been removed at the factory. A plug which is
supplied with the installation kit must be inserted into Pin 36 of the mating connector.
See figure 3-5 for a schematic and pinout of the SA 15
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3.3.2 SA 3 NVG Regulator/ Dimming Module
The SA 3NVG Regulator/ Dimming Module provide a source of power to drive up to .5 amps
of continuous current for aircraft annunciators. The SA 3NVG will provide 1 amp short term
for testing of annunciators. Aircraft power is supplied to 7 pins for installation flexibility.
Three adjustments allow setting the High, Low and NVG intensity of the annunciators. A
ground is applied to Pin 4 of the connnector J1 to put the SA 3NVG in the NVG mode. A
ground on J1 Pin 3 puts the output in Dim (night) mode and with both J1 Pins 3 and 4 open
the output is in the Bright (day) mode.
The SA 3NVG must be mounted in the right most slot of to the SRU 5-01 Sandia P/N
305018-01 and secured with two 1/2 inch 4-40 screws supplied with the unit. The SRU 5
acts as a heat sink and should not be mounted near flamable substances.
Pin 2 on the SA 3NVGis the keying pin and has been removed at the factory. A plug which is
supplied with the installation kit must be inserted into Pin 2 of the mating connector.
3.3.1 SA 3 & SA 3L Regulator/ Dimming Modules