1、L - -. -_ -.- _. -_ NIL-F-27002A (4) b2 m 7777706 0072358 B m B- 5- 0 q MIL-F-29001A(MC) AMENDMENT 4 31 May 1977 SUPERSEDING AMENDMENT 3 5 May 1977 MILITARY SPECIFICATION FREQUENCY CONVERTER: SOLID STATE, 12.5 KVA (10 KW), WITH TRANSIT COVER This amendment forms a part of Military Specification MIL-
2、F-29001A(MC), dated 10 May 1974. PAGE 2 Delete “two“ and substitute “three“. PAGE 3 3.1, line 3: 3.3: Delete in entirety and substitute the following: “3.3 Design and constpxtion. The solid state frequency converter described herein shall ba rapable of converting tactical utility class 2, 60 hertz (
3、Hz) 120/208 alt&nating current (ac) volts 2 5 percent, 3-phase power as defined iti MIL-STD-1332, to 400 Hz power and shall be designed to prevent excessive degradation of source power, either commercial or mobile electric power, when the frequency converter shares the source with other 60-Hz loads.
4、 measured as the worst case of any line shall not exceed 12 percent with the input as defined in MIL-STD-1332 with any permissable output load,“ The input current wave form distortion PAGE 5 3.3.3: After subparagraph (e), add the following: “(f) Lamps shall be provided to indicate when the frequency
5、 converter: . (i) (2) (3) suffers an internal malfunction. (4) (5) is operating as a master. output circuit breaker is tripped. input voltage is out of tolerance. is operating into an overload as a current source. (6) output circuit breaker is tripped by the protection circuitry. FSC 6130 PROBLEM HA
6、RD COPY Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-F-29003A (4) bl m 9799906 0073357 T m MIL-F-29001A(MC) AMENDMENT 4 4g) The frequency converter shall be equipped with a lamp test switch which will cause all indicator lamp circuits to becom
7、e energized when activated .I 3.3.4: At end of paragraph, add “and will parallel with existing 12.5 KVA frequency converters in inventory. shall not be damaged by erroneous parallel connection, including cross- parallel connection to frequency converters of like or dissimilar type.“ The frequency co
8、nverter - PAGE 7 3.3.7.2.1: At end of paragraph, add the following: “The output terminals shall be capable of being replaced individually. Provisions for replacement of the terminals The replacement provisionsshall not require any part of an output filter or EM1 filter to be replaced. shall be such
9、that they will limit the parts to be replaced to the terminal itself. replaceing these terminals is prohibited.“ Disassembly of the frequency converter proper for the purpose of PAGE 8 3.6: Subparagraph (a): Delete in entirety and substitute the following: The overall input/output efficiency at rate
10、d load shall not be “(a) less than 85 percent.“ Subparagraph (b): Delete line 10 and substitute the following: “Voltage Regulation. The output voltage shall be maintained within 23 percent of the set point for the combined effects of line, load, and temperature specified herein. The average voltage
11、of the 3 phases taken over any single cycle shall stay within this tolerance under a11 conditions, including full rated load application or removal. Page 2 of 4 pages /,- o Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-F-29001A(MC) AMENDMENT 4
12、Current Regulation. ., The output current shall remain constant within 23 percent of continuous rated current from short circuit to the voltage regulation point. *I I Subparagraph (cl: Delete in entirety and substitute the following: “(c) The frequency converter shall be protected so as to withstand
13、. without injury, an indefinite Short circuit at its output terminals during any of the specified operating parameters, The frequency converter shall also support a 140 percent load for a 1-minute period without injury or detrimental effect on reliability and shall not cause any component to be stre
14、ssed beyond its continuous duty ratings.“ PAGE 9 3.6: After subparagraph (g), add the following: I “(h) The frequency converter shall be equipped with suitable over- temperature prptection which will prevent any consequential damage to the frequency converter in the event the cooling fan shall fail
15、for any reason, the air intake or exhaust ports become obstructed, the ambient temperature becomes excessive, the equipment becomes overloaded, or any combinaLion of the preceding causes. i (i) The frequency converter shallnot be damaged by input voltage fluctuations which fall below 80 percent or r
16、ise above 120 percent of nominal value for an extended period. to a maximum continuous input of 15 percent of the nominal value. The protection shall be effective (j) The frequency converter shall incorporate circuitry which shall cause the frequency converter to trip its output circuit breaker in t
17、he event that the output voltage shall exceed 115 percent of the rated nominal value. The output voltage protection shall respond within 1/2 cycle of the output. (k) The frequency converter shall incorporate protection provisions which will prevent cascaded component failures as a consequence of a r
18、andom failure. power semiconductor devices as a result of random failures in the drive logic or as a result of random failures of switches in the output power s ys terns. I This requirement prohibits the consequential failure of 3.6.1.1: At end of paragraph, apd the following: I “Rain 12 +i inches a
19、t a horizontal wind velocity of 40 miles per hour“ Page 3 of 4 pages Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I I MIL-F-29001A(MC) MIL-F-27001A (q) 61 7797706 0073363 W AMENDMENT 4 1, PAGE 13 4.3: After subparagraph (i), delete remainder of pa
20、ragraph and substitute the following: “Cj) (k) (1) Rain in accordance with MIL-STD-810, Method 506, Procedure I. Sand and dust in accordance with MIL-STD-705, Method 711.4A. Electromagnetic interference characteristics in accordance with MIL-STD-461, MIL-STD-462 and MIL-STD-463. (m) Attitude. The fr
21、equency converter shall be operated at 150 inclination to normal in four different directions and the test results recorded. (n) The frequency converter shall be operated, without failure, for a total of 1,000 hours, including hours accumulated in above tests. (o) The frequency converter shall be te
22、sted for parallel operation both with a 12.5 KVA frequency converter from existing inventory and with another frequency converter developed under current procurement. Measure and record the input current waveform distortion as (p) specified in 3.3.“ Preparing activity: Project No. 61304187 Navy - MC :- , Page 4 of 4 .pages I. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
