A-A-52551 Starter-Generator: 300 Ampere, 28 Volts, Direct CurrentThis CID covers the requirements for a 300 ampere (A), 28 volt (V), direct current (dc) starter-generator, referred to herein as "generator". This dual purpose unit is belt driven with open construction and not submersible. The generator is used on military motor vehicles and on other equipment to start the gasoline engine connected to it and to generate dc energy for lighting, battery charging, and other purposes.

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A-A-52551A

2.2 Design and construction. Generator shall conform to the manufacturer’s design and construction with the following exceptions: Generator envelope and interface dimensions and wiring shall conform to Army Drawing 12345177. Generator shall be designed to operate with a negatively-grounded electrical circuit. The total weight of the generator shall not exceed 70 pounds.

2.3 Performance.

2.3.1 Output. Generator shall meet the performance requirements in figure 1 when the generator frame is stabilized at the highest attainable temperature, not exceeding 165F above ambient temperature at 30 volts. Generator shall be considered to be temperature stabilized when operation under constant conditions fails to cause a change in frame temperature in excess of 2F in any five minute period of any 20 minute test.

NOTES:

1. Generator shall be operated at 28 volts with 0.75 ohms in series with shunt field terminal “A”.

2. Frame shall be stabilized with 140F max. air inlet temperature.

FIGURE 1. Performance curve.