MIL-DTL-26517B
3.4.5 Cooling. The power supply shall be cooled as specified in the acquisition document (see 6.2). Fan
motors, where specified, shall conform to MIL-M-7969.
3.4.5.1 Explosion-proof fan motor. The cooling-fan motor shall be an explosion-proof type which shall not be
adversely affected internally nor ignite an explosive mixture outside the unit (see 4.5.12.10.1).
3.4.6 Electrical connections. Internal wiring of the unit shall be in accordance with the acquisition document
(see 6.2) and shall terminate as specified therein.
3.4.7 Prevention. Accidental loosening of bolts, screws, and other connections shall be prevented by lock-
washers, lock nuts, staking, or other approved methods
3.4.8 Protection. All ventilating openings shall be of such size as to prevent passage of a 5/16-inch diameter
rod.
3.4.9 Reliability. The power supply shall have a minimum acceptable meat-time-between-failures (MTBF) of
450 hours demonstrated to a 90-percent confidence level (see 4.5.18).
3.5 Performance. The power supply shall be capable of operating satisfactorily under the following conditions
or natural combinations thereof:
a.
Temperature-altitude in accordance with Figure 1 (see 4.5.12.7).
b. Temperature constant at -59° C from sea level to the maximum altitude in accordance with Figure 1
(see 4.5.12.1).
After prolonged storage at -65° C (see 4.5.12.1).
c.
d. Relative humidity up to 100 percent, including conditions wherein condensation takes place in the
form of both water and frost (see 4.5.12.2).
e.
Moist fungi encountered in tropical and semitropical climates (see 4.5.12.5).
f.
Vibration incident to service use (see 4.5.12.4).
g.
Exposure to sand and dust as encountered in desert areas (see 4.5.12.6).
h.
Exposure to atmosphere containing salt-laden moisture (see 4.5.12.3).
3.5.1 Input power. The power supply shall be capable of operating from an alternating current (AC) power
source as specified in MIL-STD-704.
3.5.1.1 Power factor. The full-load and half-load power factors shall be not less than that as specified in the
acquisition document (see 4.5.14 and 6.2).
3.5.2 Input voltage. Rated input voltage shall be 200 V. The Type-I power supply shall be designed for
operation on a voltage range of 190 to 210 V.
3.5.2.1 Transient input voltage. The power supply shall be capable of withstanding a transient input of twice
rated voltage for 0.1 second (see 4.5.15).
4
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business