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Individual trainer power conversion units |
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| MILT-81821
When permanent power distribution
3.2.1.11.6 Individual trainer power conversion units.
systems are not utilized, individual electrical power conversion units, hydraulic power units, and
pneumatic power units, as required, shall be provided for operation of each maintenance trainer or
individually operated trainer panel. Each individual power conversion unit shall be equipped with
input and output overload protection and a timer to register the hours of operation. When
applicable, 120/208V, 3-phase, 400-Hz power shall be provided by appropriate power conversion
units, as approved by the Procuring Activity, which are capable of operating from a 208V, 3-phase,
4-wire, 60-Hz, or a 230V, 3-phase, 60-Hz power source. The power conversion unit shall provide
208V, 3-phase, 400-Hz and 120V, single-phase, 400-Hz power. Power conversion unit output
tolerances, such as frequency and voltage regulation, shall conform to the requirements specified in
MlLSTD704. An output cable equipped with a connector on one end that wiII mate with the
power conversion unit input receptacle on the applicable power distribution box shall be provided.
A 50foot power input cable shall also be provided. The type and quantity of power conversion
units required shall be determined jointly by the Contractor and the Procuring Activity and shall be
specified in the Detail Specification. Trainer panels requiring four hundred (400) HZ power
exceeding five thousand (5,000) VA may receive this power from a separate frequency converter.
Trainers requiring less than five thousand (5,000) VA four hundred (400) Hz power will normally
receive power from a frequency converter mounted on the trainer panel.
Standard power supply equipment (Government stock
3.2.1.11.7 Standard power supply.
or commercial) shall be used when available in lieu of nonstandard power supplies.
Each trainer, independently operable trainer panel,
3.2.1.11.8 Power supply 28 V D C .
and panel group which requires less than twenty-five-hundred (2,500) VA of twenty-eight (28) VDC
power shall contain an integrally mounted solid-state power supply to provide sufficient power
required for operation plus a minimum twenty percent (20%) growth factor. Trainer panels
requiring power exceeding twenty-five-hundred (2,500) VA of twenty-eight (28) VDC may receive
this power from a solid-state power supply mounted on the trainer panel, or from a separate
solid-state power supply, to provide sufficient power required for operation plus a minimum twenty
percent (20%) growth factor. The number of units required shall be based on the total 28 VDC
power requirements for the trainer set, as determined jointly by the Contractor and the Procuring
Activity, and specified in the Detail Specification.
Hydraulic power units and pneumatic
3.2.1.12 Hydraulic and pneumatic power units.
power units shall be provided as required for operation of each maintenance trainer or individually
operated trainer panel, or as required to supply central power to the permanent power distribution
system of the facility. Hydraulic and pneumatic connections shall be strain-relieved as necessary to
prevent undue stresses on lines and plumbing. Components required (reservoir, pressure regulator,
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