MIL-DTL-26517B
3.5.2.2 Output voltage. Unless otherwise specified in the acquisition document (see 6.2), the output voltage
shall be in accordance with MIL-STD-704.
3.5.3 Frequency. Rated frequency shall be 400 Hertz (Hz), however, the power supply shall be designed for
operation on a frequency range of 380 to 420 Hz (see 4.5.6).
3.5.4 Continuous rating. The power supply shall be capable of delivering a continuous output in accordance
with the rating chart shown in the acquisition document (see 6.2).
3.5.5 Five-minute rating. The power supply shall be capable of delivering 150 percent of continuous rated
current for cyclical operation of 5 minutes on and 15 minutes off for a period of 7 hours. Under this overload
condition, the voltage shall not be less than that specified in the acquisition document (see 4.5.17a and 6.2).
3.5.6 One-minute rating. The power supply shall be capable of delivering 250 percent of continuous rated
current for cyclical operation of 1 minute on and 18 minutes off for a period of 7 hours. Under this overload
condition, the voltage shall be not less than that specified in the acquisition document (see 4.5.17b and 6.2).
3.5.7 Short-circuit capacity. The power supply shall be capable of delivering a short-circuit current of at least
500-percent rated-load current for 1 second (see 4.5.8.3).
3.5.8 Over-voltage. The power supply shall be capable of continuous operation on an input voltage of 220 V
(see 4.5.13).
3.5.9 Temperature rise. The temperature rise of the components shall not exceed their breakdown limit under
the temperature and altitude operating conditions shown in the acquisition document (see 4.5.12.7.1 and 6.2).
3.5.10 Voltage regulation (see 4.5.2).
3.5.10.1 Type I regulated units. The power supply shall be so designed that the output voltage will remain
within the limits specified in the acquisition document (see 4.5.2.1 and 6.2) when the load on the power supply is
varied from no load to full load and the input voltage and frequency are maintained within the limits of 190 to 210 V
and 380 to 420 Hz (see 4.5.6). No bleeder resistor shall be connected between the direct current (DC) output
terminals of the power supply.
3.5.10.2 Type II non-regulated units. The power supply shall be so designed that the output voltage will
remain within the limits specified in the acquisition document (see 4.5.2.2 and 6.2) when the load on the power
supply is varied from the minimum specified load to full load and the input voltage and frequency are maintained
within the limits of 195 to 210 V and 380 to 420 Hz (see 4.5.6). No bleeder resistor shall be connected between the
DC output terminals of the power supply.
3.5.10.2.1 No-load output voltage. At an input voltage of 210 V, the no-load output voltage of the Type II
power supply shall not exceed that specified in the acquisition document (see 6.2).
3.5.11 Parallel operation.
3.5.11.1 Type I regulated units. The power supply shall be so designed that two or more units can be operated
in parallel. During parallel operation, the output current and voltage shall remain within the limits specified in the
acquisition document (see 6.2).
3.5.11.2 Type II non-regulated units. The power supply shall be so designed that two or more units can be
operated in parallel. During parallel operation, the output voltage and current shall remain within the limits of the
load division (see 4.5.7.1 and 4.5.7.2) envelope shown in the acquisition document (see 6.2) when the units are
operated at rated input voltage and frequency.
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