Whelen Engineering Company A490ATSC User manual

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®
ENGINEERING COMPANY INC.
Route 145, Winthrop Road,
Chester, Connecticut 06412
Phone: [phone]
Fax: [phone]
Internet: www.whelen.com
Sales/Service e-mail: [e-mail]
Aviation
Installation Guide:
Model A490ATSC
P/N 01-0770062-03
Strobe Power Supply
(FAA/PMA Approved)
©2001 Whelen Engineering Company Inc.
Form No.13610A (030303)
Specifications:
Position Lights -
Current Draw................4.0 Amps @ 14 Volts D.C.
2.0 Amps @ 28 Volts D.C.
Weight...........................1.7 lbs.
Length........................... 5.00”
Width............................. 3.12”
Height ........................... 3.06”
INSTALLATION PROCEDURES...
Mounting Location
1. Consider areas or locations designated by the aircraft
manufacturer. Do not mount the strobe power supply
closer than three (3) feet of the ADF loop.
2. For alternate locations, consider areas such as the
cabin baggage compartment, the floor under the seat,
non-structural bulkheads, firewalls, etc..
3. If necessary, fabricate support brackets or shelves, and
attach them to the aircraft structure to provide a
mounting surface that will withstand the inertia forces
stipulated in chapters 1 & 3 of AC 43.13-2A.
4. An “IA” or other representative of the FAA must approve
documentation of structural integrity of the fabricated
installation.
5. When installing the strobe light power supply in an
inverted position, drill a 3/16” diameter hole in the lowest
corner of the cover to provide for moisture drainage.
Care must be taken not to let the drill protrude into the
power supply, for it will inflict damage to the electronic
components.
6. Specifically call out the location of the strobe light power
supply of FAA form 337.
Operation:
This power supply will operate ONE strobe light
head assembly at 34 joules of power. It is equipped
to flash up to five (5) other like units simultaneously
when an 18 gage wire is connected to outlet 3 on the
input power connector.
Wiring Instructions
WARNING! STROBE LIGHT POWER SUPPLIES ARE
POLARITY SENSITIVE. REVERSING THE
INPUT POLARITY WILL CAUSE SEVERE
DAMAGE TO THE POWER SUPPLY!
Steps below: “Ref. AC 43.13-1B, Chapter 11, Sections 1, 2, 3 & 7”.
1. Choosing wire size of A+ input lead, refer to Paragraph 444
“Electric Wire Chart” Figure 11.7 & 11.7A, with reference to
“Strobe Light Model Current” requirement chart on page 6 &
11, and “Wire and Circuit Protection Chart” Figure 11.1.
2. Shielded wire is not generally necessary, but has proven
effective in reducing the possibility of radio interference.
3. The power supply shall acquire its power from a low
impedance source such as the alternator or generator end of
the electrical buss as close to the battery as possible.
4. For penetrating pressure hull, refer to the aircraft service
manual.
5. Check all avionics systems for interference.
OUTPUT POWER
POS. 1 (+), RED
POS. 2 (-), BLACK
POS. 3 - SYNC
1 - Anode
2 - Cathode
3 - Trigger
1 - (+)
2 - (-)
3 - SYNC
1
2
3
1
2
3
Looking at the power supply connectors with the mounting plate
flat on a bench, the left connector is the strobe outlet. The right
connector is the power input and synchronization.
Left Connector (Power Output)
Pin 1. (Top) - RED wire/anode
Pin 2. (Center) - BLACK wire/cathode
Pin 3. (Bottom)- WHITE wire/trigger
Right Connector (Power Input)
Pin 1. (Top) - RED wire/13 to 30 volt, positive input
Pin 2. (Center) - BLACK wire/ground
Pin 3. (Bottom)- Synchronization pin/If synchronization is
desired, connect an 18 gage wire between
pin 3 on each power supply.

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INTERCONNECTING CABLE...
1. The Whelen interconnecting cable shall be secured in place
with approved aviation techniques.
2. The cable shall not parallel ADF, Gyro or Flux Gate compass
leads closer than 12 inches.
3. CABLE COLORING CODING (see figure 3):
PIN 1 - RED (Anode)
PIN 2 - BLACK (Cathode)
PIN 3 - WHITE (Trigger)
SHIELD - Ground at power supply end only
Caution: When pins 1 & 2 or pins 2 & 3 are reversed, the
system will appear to operate normally, however
this condition will cause premature flash tube
failure.
IMPORTANT NOTE:
Your new strobe power supply has an additional circuit built-in to prevent
self-ionization (steady glowing) of the strobe tubes. In some cases, when
replacing older power supplies, the bare shield wire in the existing
harness is pinned together at each end with the black wire. The following
modification must be made to ensure proper operation.
1. At the strobe tube end of the cable, cut the shield wire and tape it off
(DO NOT CUT THE BLACK WIRE).
2. At the power supply end of the cable, cut the shield wire and connect
it to a good ground (DO NOT CUT THE BLACK WIRE).
3. This must be done for each strobe light connection (see figure 3).
SHIELD
CLIP
WHITE
BLACK
RED
SHIELD
BLACK
WHITE
RED
OBSERVE COLOR AND PIN NUMBERS. CABLES CONNECTING REMOTE
POWER SUPPLY TYPE STROBE LIGHTS MUST BE CONNECTED CORRECTLY!
INTERMIXING STROBE LIGHT SYSTEM EQUIPMENT
Whelen Engineering and Aero-flash wiring
between light assemblies and remote
power supplies are identical as pictured
below.
Grimes and SDI (Hoskins) wiring between
light assemblies and remote power sup-
plies are identical as pictured below.
Both Grimes and SDI sometimes use MS
(Cannon Type) Connectors:
AB
C
= RED (Anode), = WHITE (Trigger),
= BLACK (Ground)
PIN 1 = RED (ANODE)
PIN 2 = BLACK (CATHODE)
PIN3=WHITE (TRIGGER)
SHIELD = RFI DRAIN TO GROUND
POWER 1
X
3 POS. PIN HSG
3 CONDUCTOR SHIELDED CABLE
SHIELD WIRE CUT AND TAPE SHIELD WIRE
AT STROBE TUBE END
GROUND SHIELD WIRE
AT POWER SUPPLY END
3 POS. SOCKET HSG
1
SUPPLY
STROBE
TUBE
END
22
END 3 3
Fig. 3