1、AMSC N/A 5925 INCH-POUND MIL-DTL-24347B w/ Amendment 2 07 May 2008 SUPERSEDING MIL-DTL-24347B w/ Amendment 1 06 September 2002 DETAIL SPECIFICATION MONITOR, AVAILABLE LOAD, 60 AND 400 HERTZ, A.C., 1 PHASE, ELECTRICAL POWER (NAVAL SHIPBOARD USE) This specification is approved for use by all Departmen
2、ts and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers an available load monitor (ALM-2) to be used for sensing a load on either a 115 or 440 volt single phase circuit of either 60 or 400 hertz (Hz). ALM-2 is a direct replacement for ALM-1. ALM-1 is not to be pro
3、cured for new constructions or replacement purposes. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3, 4 or 5 of this specification. This section does not include documents cited in other sections of this specification or recommended for additiona
4、l information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3, 4 or 5 of this specification, whether or not they are listed. 2.2 Government documents
5、. 2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract (see 6 2). DEPARTMENT OF DEF
6、ENSE SPECIFICATIONS MIL-S-901 - Shock Tests, H.I. (High-Impact); Shipboard Machinery, Equipment and Systems, Requirements for. MIL-E-917 - Electric Power Equipment, Basic Requirements. MIL-E-2036 - Enclosures for Electric and Electronic Equipment, Naval Shipboard. MIL-DTL-15024 - Plates, Tags and Ba
7、nds for Identification of Equipment. General Specification for. MIL-P-15024/5 - Plates, Identification. MIL-PRF-19500 - Semiconductor Devices. General Specification for. Comments, suggestions, or questions on this document should be addressed to: Defense Supply Center, Columbus, ATTN: DSCC-VAT, Post
8、 Office Box 3990, Columbus, Ohio 43218-3990 or by email CircuitProtectdla.mil. Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at http:/assist.daps.dla.mil. Provided by IHSNot for ResaleNo reproduction or networki
9、ng permitted without license from IHS-,-,-MIL-DTL-24347B w/ Amendment 2 2 DEPARTMENT OF DEFENSE STANDARDS MIL-STD-167-1A - Mechanical Vibrations of Shipboard Equipment (Type I - Environmental and Type II - Internally Excited). MIL-STD-461 - Requirements for the Control of Electromagnetic Interferenc
10、e Characteristics of Subsystems and Equipment. MIL-STD-810 - Environmental Engineering Considerations and Laboratory Tests. MIL-STD-1399-300A - Interface Standard for Shipboard Systems Section 300A Electric Power, Alternating Current (Metric). DEPARTMENT OF DEFENSE HANDBOOKS MIL-HDBK-470 - Designing
11、 and Developing Maintainable Products and Systems, Volume I. MIL-HDBK-781 - Reliability Test Methods, Plans, and Environments for Engineering Development, Qualification, and Production. (Copies of these documents are available online at http:/assist.daps.dla.mil/quicksearch/ or http:/assist.daps.dla
12、.mil or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094). 2.3 Order of precedence. Unless otherwise noted herein or in the contract , in the event of a conflict between the text of this document and the references cited herein, the text of t
13、his document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 First article. When specified (see 6.2), a sample shall be subjected to first article inspection (see 6.4) in accordance wit
14、h 4.2. 3.2 General requirements. The enclosure and hardware material shall be of corrosion resistance material. The monitor fabricated of static components, shall be in accordance with MIL-E-917, and the requirements of this specification except as otherwise specified in the contract or order. If an
15、y requirement specified herein conflicts with the requirements of MIL-E-917, the requirements of this specification shall govern. 3.2.1 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and externally. Tin content of the available load monitor components
16、and solder shall not exceed 97 percent, by mass. Tin shall be alloyed with a minimum of 3 percent lead, by mass (see 6.7). 3.2.2 Painting. Parts not fabricated of a corrosion-resisting material or having a corrosion-resistant treatment as specified in MIL-E-917, except for semi-conductors, shall be
17、painted as specified in MIL-E-917. One coat of gray enamel or epoxy shall be applied to the outside of the enclosure. Touching-up will be permitted for marks or scratches due to factory handling. Powder coat which meets the color requirement is permissible. 3.3 Definitions. Definitions shall be as s
18、pecified in MIL-STD-1399-300A. 3.4 Performance. The single phase monitor shall perform the functions specified herein when connected in either a single or three phase main power circuit of either 115 or 440 normal voltage and either a 60 or 400 Hz normal frequency. The monitor shall operate within t
19、he specified limits when the voltage is reduced to 85 percent of normal or raised to 10 percent above normal. The operating frequency range shall be plus or minus 5 percent of normal. A typical monitor external wiring diagram is shown on figure 1. The monitor shall receive its voltage from the load
20、side connections of the disconnect device. Under the above conditions, the monitor shall permit the load disconnect to close and stay latched if a load of 1-1/2 amperes (plus or minus 15 percent) exists. When the load current is reduced below 1-1/2 amperes (plus or minus 15 percent), the monitor sha
21、ll actuate its normally open single contact static device to close and cause the disconnect device to open. Upon receipt of a signal, the contact shall have a delay adjustable from 5 seconds to 30 seconds before it operates. If current goes above 1-1/2 amperes before the set delay time, the monitor
22、shall reset. The delay time shall be set at 15 seconds unless otherwise directed in the contract or order. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24347B w/ Amendment 2 3 3.4.1 Contact device. The static single contact device in the m
23、onitor is considered normally open when normal voltage and a load current of 1-1/2 amperes (plus or minus 15 percent) or more is available at the monitor. The normally open contact shall have a minimum continuous rating of 10 amperes, and intermittent rating of 15 amperes. 3.4.2 Input power. The mon
24、itor shall meet the performance requirements of 3.4 when powered in accordance with MIL-STD-1399-300A, types II and III. 3.5 Static components. Static components shall be in accordance with MIL-E-917. JAN, JANTX, JANTXV semiconductors in accordance with MIL-PRF-19500 are preferred. It is recommended
25、 that MIL-PRF-19500 be consulted for guidance when assessing the quality and reliability of controlled rectifiers, transistors and diodes. Field adjustment of the sensing circuits shall be provided to compensate for aging of components. Each monitor shall be provided with a toroid-type current sensi
26、ng transformer as shown on figure 2 for external mounting on one wire connected on the load side of the disconnect device. 3.6 Trip duty. The monitor shall sense the load circuit continuously and shall permit the closing and tripping of the disconnect device continuously at 10-second intervals (see
27、4.5.6.1). 3.7 Enclosure. The enclosure shall be of dripproof or watertight construction in accordance with MIL-E-2036 (see 6.2), and as shown on figure 3. Holes of 1-1/16 inch diameter shall be placed in the two sides of the enclosure. The manufacturer shall recommend cable connectors that will ensu
28、re dripproof or watertight construction. 3.8 Internal components. Internal components shall be in accordance with MIL-E-917 and shall be mounted in an assembly which can be readily removed from the enclosure. The terminal board for connection of external wiring shall be marked as shown on figure 1.
29、Printed circuit boards shall be conformal coated. 3.9 Ventilation. Ventilation shall be by natural draft. 3.10 Environmental. 3.10.1 Ambient temperature. The normal ambient temperature shall be 50 degrees Celsius (C). The monitor shall meet the specification requirements when operating in an ambient
30、 temperature from 0 to 65C. 3.10.2 Humidity. The monitor shall meet the requirements specified herein when exposed to an ambient humidity within the humidity range specified in MIL-STD-810 (see 4.5.14). 3.11 Mounting. The monitor shall comply with the mounting dimensions shown on figure 3. Dimension
31、s for the monitor current sensing transformer shall be as shown on figure 2 and shall meet the mounting requirements specified in 3.5. 3.12 Weight. The weight of the monitor and its separate sensing transformer shall be held to a maximum of 4.0 pounds. 3.13 Insulation resistance. The insulation resi
32、stance of all circuits shall be not less than 10 megohms (see 4.5.3). 3.14 Dielectric strength. The monitor shall withstand, for 1 minute, a dielectric test voltage between separate circuits and to ground as follows (see 4.5.11): Ac (rms) input or output voltage) Test voltage (rms) 60 and under 600
33、61 to 90 900 91 to 600 1000 plus twice rated Over 600 2000 plus 2-1/4 times rated Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24347B w/ Amendment 2 4 Typical wiring shown for monitor when connected to a circuit breaker with shunt trip coi
34、l on a 440 volt circuit. Monitor normally open static contact is rated at a minimum of 10 amperes continuous, and intermittent rating of 15 amperes. In each application the 115 volt - 115 volt or 440 volt - 440 volt terminals, as applicable, shall be connected to the load side of the main circuit di
35、sconnect device. FIGURE 1A. Typical external wiring connections to monitor for shunt trip application. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24347B w/ Amendment 2 5 Typical wiring shown for monitor when connected to a circuit breake
36、r with motor operator on a 115 volt circuit. Monitor normally open static contact is rated at a minimum of 10 amperes continuous, and intermittent rating of 15 amperes. In each application the 115 volt - 115 volt or 440 volt - 440 volt terminals, as applicable, shall be connected to the load side of
37、 the main circuit disconnect device. Figure 1B. Typical external wiring connections to monitor for motor operated circuit breaker application. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24347B w/ Amendment 2 6 FIGURE 2. Outline dimension
38、s for monitor current sensing transformer. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24347B w/ Amendment 2 7 3.15 Vibration. The monitor shall withstand vibration in accordance with type I of MIL-STD-167-1A without mechanical damage or
39、malfunctioning (see 4.5.12). 3.16 Shock. The monitor shall withstand shock specified in MIL-S-901 for light weight equipment without the use of shock mounts. With rated voltage applied all devices shall function properly during and after the shock test (see 4.5.15). Mounting fixture 4A in accordance
40、 with MIL-S-901 shall apply. 3.17 Interference. The monitor shall meet the interference limits as specified in MIL-STD-461 (see 4.5.8). 3.18 Inclined operation. The monitor shall show no change in operation when inclined at an angle of 45 degrees from the vertical in any direction (see 4.5.7). 3.19
41、Warm -up. The monitor shall meet the performance requirement specified herein after being energized for a maximum of 1 minute (see 4.5.5). 3.20 Reliability. The upper test mean time between failure (MTBF) for continuous and intermittent operation shall be 40,000 hours, under the environmental condit
42、ions specified for the monitor, when tested in accordance with 4.5.10. It is recommended that MIL-HDBK-781 be used as guidance in accomplishing this testing. A failure (as used herein) shall be as specified in 4.5.16. 3.21 Maintainability. The monitor shall facilitate trouble-shooting, fault isolati
43、on, and repair down to the lowest nonrepairable part or nonrepairable assembly (see 4.5.10). 3.22 Interchangeability. In no case shall parts be physically interchangeable or reversible unless such parts are also interchangeable or reversible with regard to function, performance and strength. 3.23 Co
44、nnection diagram and identification plates. Plates shall be in accordance with MIL-DTL-15024 and MIL-P-15024/5. The plates shall be brass or corrosion-resistant steel of not less than 0.030 inch in thickness and marked by etching, engraving, stamping or photoprocess. The marking shall be not less th
45、an 0.003 inch deep. 3.23.1 Connection diagram plate. Each monitor shall be provided with a connection diagram plate mounted on the inside surface of the front cover. The plate shall contain the data shown on figure 1. 3.23.2 Identification plate. Each monitor shall be provided with an identification
46、 plate mounted on the outside of the front cover. The identification plate for the complete equipment assembly shall indicate the following data: MONITOR: AVAILABLE LOAD VOLTAGE: 115-400 PH.1 AC ALM-2: ALM-Q FREQ: 60-400 DUTY: CONT. AMB.: 50C CONTACT: NORMALLY OPEN UNDER LOAD CONTACT RATING: minimum
47、 10 AMP. CONT. CLOSING LOAD: 1-1/2 AMPS. OPENING LOAD: LESS 1-1/2 AMPS. CAT. NO. SER NO. YEAR STK. NO. CONTRACT NAVSHIPS 0963- MANUFACTURERS NAME AND ADDRESS 3.23.3 Component identification. Components shall be identified by stamping or stenciling the data immediately adjacent to the component. 3.24
48、 Provisioning. See 6.5. 3.25 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible provided that the material meets or exceeds the operational and maintenance requirements, and promotes
49、 economically advantageous life cycle costs. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24347B w/ Amendment 2 8 3.26 Workmanship. Metal surfaces shall have a smooth finish and all details of manufacture, including the preparation of parts and accessories, shall be in accordance with the best practice for high qual
