1、 - MIL-I-L2657A bL m 7777706 0085726 O m Ri.a-i . .- . - - - - . _-._. ,._- _-.* _-_ - MIL-I- 12 659A (Ord) 24 June 1954 SUPERSEDING MIL-I-l2659(0rd), - .-. . 24April 1953 MILITARY SPECIFICATION INVERTER, 350 VOLT AMPERE . 1. scope 1.1 This specification covers an inverter which is a component of Se
2、t, Wiring, MlOAlEl for use with Gun, Twin, 40MM, Self-Propelled, M42, 2. APPLICABLE SPECIFICATIONS, STANDARDS, DRAWINGS AND PUBLICATIONS 2.1 The following specifications, and drawings, of the issue in effect on the date of invitation for bids, form a part of this specification: SPECIFICATIONS U. S.
3、Army 51 - 7 Instruments, Fire Control; General Specification Governing the Manu- facture and Inspection of . DRAWINGS Ordnance Corps D7 692245 Inverter, 350 Volt Ampere (Copies of specifications, standards, and drawings required by contractors in connec- tion with specific procurement functions shou
4、ld be obtained from the procaring agency or as directed by the contracting officer). 3. REQUIREMENTS 3.1 General. - Unless otheiwise specified, the requirements common to all fire control .instruments as contained in Specification 51-7 shall be mandatory. 3.2 Material. - specifications forming a par
5、t of this specification. Material shall be in accordance with the applicable drawings and 3.3 Electrical 3- - - - THIS DOCUMENT CONTAINS L PAGES 7“ / Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I . .-_ I_ - .- . MIL-I-L2657k bL = 777770b 0085727
6、2 = i . . 3.3.1 Power rating. - .The inverter shall be rated at 350 volt amperes at 30 percent power factor, having 115 volt, 60 cycie output, with 34 d. c. input. 3.3.2 Balance. - The rotor shall be in dynamic balance at ail speeds up to and includin . 25 percent above rated speed. The balancing sh
7、all be accomplished by such means as will preclude the possibility of material shifting and. destroying rotor balance, Solder I . , :i;-g:-fiiiyfi- - -.- . -. -. I.I _- -_ ._. . . ,._. F . I .-. . , . . shall not be used as a method of balance. . 3.3.3 Characteristics. - Each unit shall have the fol
8、lowing characteristics when tested at an ambient temperature between 60 F and SO“ F at a barometric pressure of 28 to 32 inches of mercury, and a relative humidity not greater than 80 percent. . . - . 3.3.3.1 No load output. - Input volts 24 volts d. c. . Input current 8 amps d;ci (ma) 3.3.3.2 Rated
9、 load output (350 volt ampere) Input volts Output volts Output power 105 watts Output frequency 60 cycles 24 volts d. c. 115 volts a. c. input current 12 amps d.c. 3.3.3.3 Operation with 18 volt input Input volts Input current Output volts Output power 22 watts Output requency 60 cycles 18 volts d.
10、c. 9.2 amps d. c. 87 volts a. c. - +2 percent + 15 per cent + 5 percent + 10 percent - + 3 percent - - - - + 1 percent + 20 percent min. min. + 3percent - - ,. . ,. . ! 1:I.:ll: . . . L . _.- . .- ) . .-I . - -_. _._-_-.- -_ . - . . - . 1 : :. . ,_. . )_. . ,. . . , . ._ - - - ._ - . . . . . ixi: .
11、,._. . . . . . . . ,.-.e. . . . . . . ,. . . . . 3.3.3.4 .Operation with 30 volts input 5. Input volts . 80 vdts d. CI Output volts i43 wits a, I Input current 17 amp“. d, c. . Output power 170 watts . .Output frequency 60 cycles . . . . . b -.- . -.-. .- F I + 1 percent + 15 percent + 5percent - +
12、3 percent . . .-: -I I- .- . - . . - - . - + 1Percent -. . . 3.3.4 -High potential. - decrease- in dielectric strength of the insulation sufficient to cause failure of the inverter when it is subjected to the test specified in42.2. There shall be no puncture- of insulation, no sparkover, or . .-.- .
13、 - _.I . _.-. . ._ . _. _-I_- -.I-* -_ - -.-. -.- . . . . . . .-. . 3. 3. 6 Temperature rise. - The temperature riSe of the inverter shall not exceed . . . . 1 :I , 65 C (117 F) after it has been subjected to 2 hours continuous -operation at the rated conditions specified in 3.3.1.- Test shall.be co
14、nducted in accordance with 4.2.3. . . _.- . .-.-_ ._. i -. n . .: . 4 3.4 Environmental :. . I . . . f J . . 4 . . . - .- . . .- . - _. I. ._I . I . i, * I - , . . “_ . i r . 2 . - 4 I_ -_-.I- A . . . q . . . . I . . I _. . . . _I . _ . -. . ., . _._ . . . i _- - . . - q . i . . . . . . . _ . ,. . -
15、 . . . . ,- 3,4.1 Temperature. - The.iaverter shall meet the requirements of 3.3.3.2 throughout the air temperature range extending from plus 51.5C (+125“ F) (minimum exposure of 4 hours with full impact of solar radiation, 360 BTU/Pt. Sq/Hr.), to minus 31.2“ C (-25“ F) (minimm exposure of 3 days wi
16、thout benefit of solar radiation) The inverter shall be capable of safe storage within the air temperature range xt ending from plus- 71“ C (+IGO“ F) (for periods as long as 4 hours per day) to minus 62.2“ C (- 80 F) (for. periods of at least 3 days duration). Test shall be conducted in accordance w
17、ith 4.3.2. 3.4.2 Vibration. - ments of 3.3.3.2 immediately after being subjected to the vibration test specified in 4.3.3. The inverter shall not suffer damage or fail to meet require- 3.4.3 Shock. - The inverter shall not suffer damage or subsequently fail to meet the requirements of 3.3.3.2 immedi
18、ately after being subjected to the shock test .of 4.4.4. ,3.5 Workmanshie. - Workmanship shall be in accordance with Specification 51-7. 4. SAMPLING, INSPECTION AND TEST PROCEDURES 4.1 Gcncrtil. -.- - conformaiice with this specification and Specification 51-7, Unless otherwise specified, . standard
19、 ambient tests shall be performed at a temperature of 60 F to 90 F, at a barometric pressure of 28 to 32 inches of mercury, and a relative humidity not greater than 80 percent. Unless othcrwise specified, each invertor shiill bo inspoctcd for * . 4.2 Electrical tests 4.2.1 High potential. - All grou
20、nded capacitors shall be discomeoled during this test. The inverter shall be subjected to a potential of 900 volts rms, with a frequency of 60 cycles per second, for a period of one minute. Three of the first five and one . out of every additional 50 or fraction thereof shall be subjected to the tes
21、t voltage which shall be applied at a rate not exceeding 500 volts (rms) per second. For all other units the test voltage may be applied instantaneously for a period not less than 5 seconds o. more than 30 seconds, Insulation resistance test shall be performed immediately after this test. . I. . . .
22、= ._ +-. 1 . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I . _. . .- .- -I. - .I.- NIL-I-L2659A 61 7799906 0085927 b W . 4.2.2 Insulation resisthce. - All grounded capacitors shall be disconnected during this test. a source of d-c potential of 50
23、0 volts. 4.2.3 Temperature rise. - Three of the first five inverters and one out of every The insulation. resistance shall b measured by an approved method using - ,. * The , . additional 50 or fraction thereof shall be tested. ._I “ . _I -.- . I .-.- - - .inverter shall be tested in still air and s
24、hall-not be mounted in a manner that-will potential and the insulation resistance tests shall be repeated. The temperature rise shall be determined as follows: cause heat dissipation through the mounting. Immediately after this test the high point ;:-.:-;.: .-.I . . . . .-.- - . a. b. C* A stop watc
25、h shall be started at the instant the unit is stopped. Necessary bridge connections shll be made. A value of resistance which is slightly smaller th* the resistance . of the winding shall be preset into the bridge. Observe the null ._ .-. . _-_ . -.- - . -. . - indicator of the bridge; and the insta
26、nt the needle crosses the “zero“ position, rccord the time and the value of the resistance set into. the bridge, This procedure shall be followed until five values of resistance versus time after shutdown are recorded. These . time, and the curve extrapolated to zerb time, (R)at zero time shall be u
27、sed in equation (2) in ordex to obtain -.-._.- . - . . r:; . ,-.-. . -_. ,.* . .- ._,. . _ I.:st= in the following sub-paragraph. Three of the first five inverters and one out of every . - - I =I . . :- .- i. .I -4- /-, /f 7 .;. . “,., the rate of change shall not exceed one cycle per second, . . Fr
28、equeficy Limits Excursion Acceleration Time (Each Direction) 1 hour O. 060 inch -_- . 2 hours lo- 20 cps O. 030 inch 20 - 400 CPS - 4. 5 g s 2 hours 4.3.4 Shock. - The inverter shall be mounted, using its own mounting provisions, to simulate field pse. A shock of 20 gs shall be imparted three times
29、in each , direction along each of the three mutually perpendicular directions, making a total of 18 shocks. Each shock impulse shall have a time duration of 11 +- 1 milliseconds; the maximum g value shall occur at approximately 5.5 milliseconds and shall.: be within + 10 percent. Filters used shall
30、have cut-off frequencies selected to eliminate all harkonics above the fundamental, from the measured shock pulse. 5. PREPARATION FOR DELIVERY 5.1 Packaging, packina and markina - Packaging, packing and marking shall be in accordance with instructions forming a part of the contract or furnished by t
31、he contracting officer in connection with the contract. o - 10 cps -_- 6. NOTES 6.1 Ordering data. - Contracts and invition for bids should specify the title, number, date of this specification and type of packing. . NOTICE: This specification, together with specifications and drawings pertain- ing
32、to it and bearing a “NOTICE“ of similar restrictions, is intended far use only in connection with procurement by the United States Government; and shdl not be re- produced either who11 y or in part except when authorized !n connectron with Govern- ment procurement, nor be used for any other purpose except when s2ecifically authorized by the Chief of Ordnance. CUSTODIAN:. , ecorps -5- . . . :r 1 II .- *.:- - c e Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
