1、MIL-V-24761(SH) AMENDMENT 1 29 May 1995 MILITARY SPECIFICATION VENTILATING SETS, PORTABLE DAMAGE CONTROL This amendment forms a part of MIL-V-24761, dated 17 June 1991, and is approved for use by all Departments and Agencies of the Department of Defense. PAGE 13 3.6.3.4.6, delete and substitute: 3.6
2、.3.4.6 Ai Alternating current motors shall not have excessive horsepower, but shall have sufficient torque to start the fans at a motor terminal voltage of 75 volts. The motor shall drive the fan continuously at a motor terminal voltage of 104 volts when the fan is operating at its rated design poin
3、t as specified in 3.6.2.1. Alternating current motors shall conform to MIL-M-17059 as augmented by the following requirements: De s i gn : Voltage : 115 Vac, 60Hz, single phase Service : Navy Service A Horsepower: As required by fan Rated speed: As required by fan Frame : As required by fan Mounting
4、 : Face Duty: Continuous, air over cooling Enclosure: Explosion-proof, group D (See Insulation: Class B or F (see Bearings : Ball (see 3.6.3.4.5) Ambient temperature: 65 degrees Celsius Maximum temperature rise: 55 degrees Celsius Synchronous rated speed: 3600 revolutions per minute (r/min) Thermal
5、protection: UL 547 (see 3.6.3.4.4) Maximum safelocked rotor time: 90 seconds Split phase 3.6.3.4.2) 3.6.3.4.6.2) AMSC N/A FSC 4140 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Page 1 of 3 Provided by IHSNot for ResaleNo reproduction or networking permitted withou
6、t license from IHS-,-,-MIL-V-S4761(SH) AMENDMENT 1 PAGE 14 3.6.3.4.6.2, delete and substitute: 3.6.3.4.6.2 Insulation system. Alternating current motors shall be provided with an insulation system in accordance with MIL-M-17059. 3.6.3.4.7, delete and substitute: 3.6.3.4.7 Direct current motors. Dire
7、ct current motors shall not have excessive horsepower, but shall have sufficient torque to start the fans at a motor terminal voltage of 75 volts with acceptable commutation. Intermittent sparking is acceptable. Sparking shall not occur on more that one quarter of the brushes. Small yellow or white
8、points of light shall not be displayed on more than one fourth of the total edge of the brushes. This level may be determined by visual examination. The motor shall drive the fan continuously at a motor terminal voltage of 104 volts when the fan is operating at its rated design point as specified in
9、 3.6.2.1. 17556, as required, augmented by the following requirements: They shall conform to MIL-M- Design: Voltage : Service : Horsepower: Rated speed: Frame : Mounting : Duty : Enclosure: Insulation: Bearings : Ambient temperature: Maximum temperature rise: Thermal protection: Maximum safelocked r
10、otor time: Number of poles: Materials restriction: Construction: used Shunt type winding 115 Vdc Navy Service A As required by fan As required by fan As required by fan Face Continuous, air over cooling Explosion-proof, group D (See 3.6.3.4.2) class B or F (see 3.6.3.4.6.2) Ball (see 3.6.3.4.5) 65 d
11、egrees Celsius 55 degrees Celsius UL 547 (see 3.6.3.4.4) 90 seconds Four or more Silicone materials shall not be Non-magnetic Page 2 of 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-24761(SH) AMENDMENT 1 PAGE 24 4.7.2.5.1, delete and substi
12、tute: 4.7.2.5.1 Insulation system (class 0-1/2 fans). Alternating current motors shall be tested for conformance to dielectric strength, insulation resistance, and insulation system suitability in accordance with MIL-M-17059 for conformance to 3.6.3.4.6.2. Preparing Activity: Navy - SH (Project No. 4140-N152) Page 3 of 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
