MIL-PRF-62284B(AT)
3.3.3.1 Dielectric strength. There shall be no damage to the dielectric material and
insulation sufficient to cause failure of the blower when the blower is subjected to 500 Volts root
mean square (V rms) at 60 Hertz (Hz).
3.3.3.2 Insulation resistance. The insulation resistance of the motor windings when used
shall be not less than 50 megohms when tested at 500 Vdc.
3.3.3.3 Transient voltage. Transients are the changing conditions of a characteristic.
These usually go beyond the steady-state limits and return to and remain within the steady-state
limits within a specified time period. The transient may take the form of either a surge or a spike
(see figures 2 and 3). The blower shall not be damaged when subjected to a source voltage with
reverse polarity.
3.3.3.3.1 Surge. A surge is a variation from the controlled steady-state level of a
characteristic, resulting from the inherent regulation of the electric power supply system and
remedial action by the regulator, except for battery only operation. Surge may also occur due to
the application of loads in the battery only condition.
3.3.3.3.2 Spike. A spike is a high frequency oscillatory variation from the controlled
steady-state level of a characteristic. It results from very high frequency currents of complex
wave form produced when reactive loads are switched. An individual spike generally lasts less
than 50 micro-seconds by may take up to one millisecond to decay to the steady-state level.
3.3.3.4 Starting current. The blower starting current transient shall not exceed 60 A and
shall drop to 10 A, or less, within 1 second after application of input voltage. The blower shall
meet these starting requirements when operating from a 24 ± 0.5 Vdc power source which has an
impedance of 0.13 ± 0.01 ohms.
3.4 Interface requirements.
3.4.1 Overall envelope and interfaces. The blower assembly shall fit into the air cleaner
system of the M60 series tracked vehicles. The envelope dimensions and the electrical and
mechanical interface locations and dimensions shall conform to Drawings 10905010, 12251905,
and 12251912.
3.4.2 Weight. The blower assembly, without mounting hardware, shall have a maximum
weight of 8 pounds (lb).
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