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MIL-PRF-46795 Generating System: Alternator, Rectifier, 60 Amperes, 28 VoltsThis specification covers 28 volts \(V\), direct current \(dc\) generating systems, engine driven through belt or direct connection, to provide 60 amperes \(A\) for charging and operating loads. The system consists of a rotating field alternator with integral diode rectifier and adjustable voltage regulator in a single housing. This specification also covers repair parts for this system.

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MIL-PRF-46795H

b. Relative humidity: Uncontrolled room ambient.

c. Atmospheric pressure: Site pressure.

4.2.1 Batteries. 24 Vdc power source shall be two 12 Vdc military type batteries

connected in series. A battery which accepts a charging current of not more than 4.5 A at set

voltage after storage at laboratory ambient air temperature shall be considered fully charged. In

case of a high voltage reading, battery fluid specific gravity shall be inspected and, if over 1.30,

battery shall be discharged until specific gravity is not more than 1.30, and charging current is

not more than 4.5 A.

4.2.2 Stabilized frame temperature. Unless otherwise specified herein, generating system

frame temperature shall be stabilized prior to undergoing test procedure (see 6.4.2).

4.2.2.1 Frame temperature. Frame temperature shall be measured at center of stator

lamination stack on outside diameter.

4.2.3 Test voltage. Unless otherwise specified, voltage regulator shall be adjusted to

28 Vdc + 0.2 Vdc with alternator running at 2000 rpm and producing not more than 10 A. This

adjustment shall be made after frame temperature has been stabilized.

4.3 First article inspection. Samples of products to be furnished under this specification

shall undergo the examinations in 4.4.2 and tests in order listed in table I (see 3.1).

TABLE I. Order of first article testing.

Sample

number

Requirement

Test

Requirement

3.4.3

4.9.1

Rated output

3.4.2.2

4.8.2

Voltage regulation

3.4.3.1

4.9.2

Non-operating current

3.4.4

4.10

Endurance

3.4.3

4.9.1

Rated output

3.4.2.2

4.8.2

Voltage regulation

3.4.3

4.9.1

Rated output

3.4.2.2

4.8.2

Voltage regulation

3.4.6

4.12

High temperature

3.4.2.2

4.8.2

Voltage regulation

3.4.3

4.9.1

Rated output

3.4.7

4.13

Low temperature

3.4.2.2

4.8.2

Voltage regulation

3.4.3

4.9.1

Rated output

3.4.8

4.14

Shock

3.4.3

4.9.1

Rated output

3.4.2.2

4.8.2

Voltage regulation