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5 Issues You can Alter To Take Better Pictures

Aerospace relays are electrically controlled devices that open and close electrical contacts to effect the operation of other devices in the same or in another electrical circuit. The relay converts electrical energy into mechanical energy through various means, and through mechanical linkages, actuates electrical conductors (contacts) that control electrical circuits. Solid-state relays may even be utilized in electrical switching applications.

a. Use of aerospace relays. Most relays are used as a switching device where a weight reduction might be achieved, or to simplify electrical controls. It should be remembered that the relay is an electrically operated switch, and therefore subject to dropout under low system voltage conditions.

b. Forms of Connections. Relays are manufactured with various connective means from mechanical to plug-in devices. Installation procedures vary by the kind of connection and needs to be followed to ensure proper operation of the relay.

c. Repair. Relays are complicated electromechanical assemblies and most are usually not repairable.

d.Relay Selection.

(1) Contact ratings, as described on the relay case, describe the make, carry, and break capability for resistive currents only. Consult the suitable specification to find out the derating factor to use for other kinds of current loads. (Ref. MIL-PRF-39016, MIL-PRF-5757, MIL-PRF-6016, MIL-PRF-835836.)

(2) Operating a relay at lower than nominal coil voltage may compromise its performance and may never be done without written manufacturer approval.

e. Aerospace relays Installation and Maintenance. For installation and maintenance, care should be taken to make sure proper placement of hardware, especially at electrical connections. Using properly calibrated torque wrenches and following the manufacturer’s installation procedures is strongly recommended. This is very important with hermetically sealed relays, because the glass-to-metal seal (used for insulation of the electrically “live” components) is especially vulnerable to catastrophic failure because of overtorquing.

(1) When replacing relays in alternating current (ac) applications, it is essential to maintain proper phase sequencing. For any application involving plug-in relays, proper engagement of their retaining mechanism is vital.

(2) The proximity of certain magnetically permanent, magnet assisted, coil operated relays may cause them to have an effect on each other. Any manufacturer’s recommendations or precautions should be closely followed.

Aerospace switches.

LOAD CONSIDERATIONS.
When aerospace switches or aerospace relays are to be utilized in applications where current or voltage is substantially lower than rated conditions, additional intermediate testing should be performed to make sure reliable operation. Contact the manufacturer on applications different from the rated conditions.

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