Time Delay Electronic Safe, Arm and Fire Device - L-3 Communications: Electrodynamics, Inc.

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>	Time Delay Electronic Safe, Arm and Fire Device

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Time Delay
Electronic Safe,
Arm and Fire Device

The L-3 Communications, Electrodynamics (L-3/EDI) Time Delay Electronic Safe, Arm and Fire (TD-ESAF) device receives key vehicle, subsystem and environmental parameters from a missile, and validates them to safe, arm and fire two high explosive outputs. The ESAF device computes safe separation distance from internal acceleration sensors to determine the arm distance. A high-voltage DC-DC converter arms the fireset. The ESAF device is triggered on impact and can penetrate soft targets. A timer circuit delays the input trigger and produces a time-delayed fire signal to initiate the output. The ESAF device can be easily adapted to many vehicles.

Cleared by DoD/OFOISR for public release under reference number 00-S-1235 dated April 17, 2000.

Features

•	Acquires data on BIT disconnect, guidance and acceleration simultaneously
•	Digital double-integration of acceleration
•	Remains safe until safe separation distance is achieved, via integrator and backup timer
•	Serial interface for good-guidance input
•	Sequence-checking on all environments
•	High voltage arming from 28 VDC
•	Trigger switch interface and timer for precision delayed firing
•	Exploding foil initiators using HNS-IV for high insensitivity
•	BIT for safety verification
•	Meets Army and Navy ESAF guidelines
•	Passed qualification tests
•	Lightning and ESD tests
•	2.25” UN thread
•	Convection Cooling
•	100% ESS on all units
•	GSE available for test

The ESAF threads into the warhead and is suitable for use in a bomb, missile or undersea environment. It contains environment sensors, safe/arm logic, a high-voltage DC-DC converter, electronic time delay, and one Exploding Foil Initiator. This highly reliable unit has no moving parts or adjustments.

The validation function receives and checks signals for all environments simultaneously, enabling arming on proper sequence and time windows while also detecting complex disarm/dud conditions.

Selectable/programmable time delays can also be implemented.

Unit built-in test is performed on power-up and results are reported to the missile.

A telemetry interface is provided for tests. The unit will cool itself by convection. The modular design of the ESAF permits easy reconfiguration to new applications.

Design

MIL-STD-331—fuze testing

MIL-STD-454—general

MIL-STD-461—EMI

MIL-STD-704—air vehicle power

MIL-STD-810—environmental test

MIL-STD-1316—fuze safety

MlL-STD-1385—HERO

MIL-I-23659—initiators

Specifications

Size: 5.5” dia. x 1.05" thick (main)
1.92” dia. x 2.85" thick (time delay/fireset module)

Weight: 800 grams

Color: Natural metal color

Penetration: steel or masonry

Power: +15 VDC @ .75 watts and
+28 VDC @ 33 watts (arming only)

Output: Initiates PIC or booster directly

Delays: microseconds to milliseconds

Reliability: 0.998 (initial) 0.984 (10 years)

Life: 120 hours operating, 10 years useful

This PDF contains a printable version of the hard copy catalog page.		td-esaf.pdf
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Updated 11/22/06