MIL-S-26716A (USAF)
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Unless otherwise specified, AC motors shall operate on
3.7.1.2 AC power.
230/460 volt, 3 phase, 60 HZ current and shall be connected for operation on
460 volt power .
Change over from 460 to 230 volts shall be possible with the
minimum amount of addit ional parts. The electrical wire used shall be
Unless otherwise specified, AC
capable of both 230 and 460 volt operation.
motors of 1/3 horsepower or less may be operated on 110-volt single phase, 60
HZ current by use of a transformer (see 3.7.1.3), with the primary leads
arranged in such a manner that they can be selectively connected to any of
the three phase legs of the power supply to allow for load balance when the
unit is installed in conjunction with other components.
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The AC controller shall include an AC across the
3.7. 1.2.1 AC control.
line starter for the main power unit for motors less than 25 horsepower.
Motors 25 horsepower and above shall be provided with reduced voltage
starters.
Starters shall be capable of withstanding openings under starting
surges. The starters shall include overload relays for motor protection that
can be manually reset without opening the starter case.
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A transformer to supply the 110 volt power for
3.7.1.3 Transformer.
lighting and control circuits shall be provided as a component of the test
stand. The current rating for continuous operation of the transformer shall
be sufficient to adequately power the 110-volt circuits of the test stand
without overloading, and the operating temperature of the transformer shall
be within the range recommended by the transformer manufacturer.
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Unless otherwise specified, push button
3.7.1.4 Push button stations.
stations shall operate on ll0-volt, single phase, 60 HZ current,
3.7.1.5 Interlocks. Where there is more than one motor in the equipment
and possible damage may be caused by the stoppage of any one motor,
interlocks shall be provided so that the stoppage of one motor in the circuit
will not endanger or damage the equipment. Where the starting of the motors
in an improper sequence can result in damage, interlocks shall be provided to
Where cooling water or
insure starting of all motors in proper sequence.
lubrication are required for components of the test unit such as vacuum pump
or gear cases, the controls for such shall be automatic or shall be
interlocked with the motor controls in a manner to prevent damage to the
equipment through operating error or an over temperature or over pressure
condition.
All wiring conduit, switches, and other standard
3.7.1.6 Wiring.
electrical components of the test unit shall conform to the applicable
requirements of the (current edition) National Electrical Code.
3.7.1.7 Electrical connections.
All electrical power sources connections
to the equipment shall be made to terminal strips in a junction box located
The wires
so that wires may enter from the top of the test equipment unit.
shall be coded to conform with the code numbers of the wiring diagram. An
additional junction box shall be provided for lighting and control circuits.
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