FORD EC1-1992 NEMA AC MOTOR STARTERS ELECTRO-MECHANICAL TYPE REQUIREMENTS AND TESTS《NEMA电气-机械型交流电动机起动器的要求和试验》.pdf

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1、FORD MANUFACTURING STANDARDS EC1 NEMA AC MOTOR STARTERS, ELECTRO-MECHANICAL TYPE, EC1 DECEMBER 1992 REQUIREMENTS AND TESTS; .: ., .: Page 1 . 1. SCOPE: This standard describes requirements and tests for motor starter assemblies and combination motor starters intended for general use throughout the F

2、ord Motor Company. 2. GENERAL: 2.1 Prior to placing starters on test as described in Section ll., the manufacturers line of starters shall be reviewed for compliance with the features and requirements outlined in this standard, 2.2 Motor starters shall be rated according to NEMA Standard ICS.2, Indu

3、strial Controls and Systems. The following ratings are for operation at 460 ac, 60 Hz., three-phase. Size 1 - Up to and including 10 horsepower. Size 2 - Above 10 but not exceeding 25 horsepower. Size 3 - Above 25 but not exceeding 50 horsepower. 2.3 Starters shall comply with NEMA and UL requiremen

4、ts for heat rise tests. Starters shall be listed in the UL “Electrical Construction Materials List“, prior to acceptance for Ford tests and approval. Each starter manufacturer shall furnish evidence of this listing. CSA acceptance is required for Ford plants in Canada. 2.4 The mechanical and electri

5、cal interlock system on reversing starters shall be effective in preventing operation of the opposite assembly. In no case shall the mechanical interlock hold an assembly in other than the fully open position, or allow a jam to occur between the two assemblies if they are energized simultaneously. 2

6、.5 Each supplier shall have available a complete range of starters rated according to NEMA Standard ICS, through and including size 3 (50 horsepower), and should have available similar designs through size 5 (200 horsepower). 2.6 Multiple starter assemblies, e.g., reversing and multi-speed types, sh

7、all have the required number of starters mounted to a common base plate with screws to allow individual contactor replacement. 2.7 Metal parts shall be non-corrosive or otherwise tinned, plated or treated to resist the effects of corrosion and oxidation. Current carrying parts in the power circuit s

8、hall be of copper or copper alloy. 2.8 Interchangeable mounting dimensions are preferred for starters rated NEMA sizes 1 and 2. FORD MANUFACTURING STANDARDS EC1 NEMA AC MOTOR STARTERS, ELECTRO-MECHANICAL TYPE, EC1 DECEMBER 1992 REQUIREMENTS AND TESTS Page 2 2.9 Any change in an approved starter will

9、 require further evaluation and approval to remain on the acceptance list. Changes shall be indicated by a revision of the model or series number. The model and/or series numbers shall be shown on the exterior of the package in which the starter is shipped, as well as on the starter nameplate. 3. EL

10、ECTRICAL RATINGS 3.1 VOLTAGE 3.1.1 Starter solenoid coils shall be nominally rated for 115 ac (60 Hz) or 24v dc. 3.1.2 The starter solenoid coils shall operate successfullywithin a voltage range of plus 10% to minus 15% of the nominal supply. Voltage variations may be gradual or instantaneous excurs

11、ions from the nominal. 4. TEMPERATURE RATINGS 4.1 Starters shall be capable of operating continuously inside an enclosure in a temperature range from -32 C to 71 C(-26 F to 160 F). 5. CONTACTS 5.1 Power contacts shall be replaceable without removing the starter housing from the mounting plate. Movab

12、le contacts shall be replaceable without disconnecting any terminal wiring. Stationary contacts should be replaceable without disconnecting terminal wiring. 5.2 Only three power contacts are required. 5.3 Auxiliary contact assemblies shall include both normally open and normally closed type contacts

13、 with four separate terminals (no common). Mounting provisions shall be provided for a minimum of four contact assemblies (includes the electrical interlocks on reversing starters) in any combination of open or closed arrangement on each starter assembly. Auxiliary contact assemblies shall not be fi

14、eld convertible. 5.4 Provision shall be made to add, remove, or replace auxiliary contact assemblies without removing or disturbing other components on the starter. 5.5 Reversing starters shall be equipped with normally closed electrical interlocks in addition to the mechanical interlock. FORD MANUF

15、ACTURING STANDARDS EC1 NEMA AC MOTOR STARTERS, ELECTRO-MECHANICAL TYPE, EC1 DECEMBER 1992 REQUIREMENTS AND TESTS .I . Page 3 6. TERMINALS AND WIRING 6.1 Power and control terminals shall accommodate type MTW conductors, minimum 19 strands. AWG no. 8 and smaller conductor strands shall be clamped bet

16、ween two nonrotating surfaces. Saddle or pressure plates shall be captive to the terminal screw. Neither the head nor the point of the terminal screw shall bear directly on conductors AWG size 8 and smaller. 6.2 Conductors smaller than AWG 10, used for integral wiring of the starter, shall be strand

17、ed, type MTW. 6.3 All terminals shall be accessible for wiring and testing without removal or disturbance of other components on the starter. 6.4 Each terminal, power and control, shall be permanently identified, and shall coincide with published diagrams by the manufacturer. 6.5 Wiring of the power

18、 circuit shall be of the straight-through design, with line terminals above and load terminals below the moving assembly. The load terminals shall be adjacent to each other. The design shall use a minimum number of joints between the line and load terminals. 6.6 Provisions shall be made to terminate

19、 power factor correction wiring to the terminals between the contactor and the overload assembly. 7. OVERLOAD RELAYS 7.1 Overload relays shall be of the “trip free“ type which will prevent premature reset after tripping. When the overload unit has tripped, it shall be necessary to press and release

20、the reset button to reset the overload contact(s). After normal reset, depressing the reset button shall not affect operation of the overload contact(s), Continuous depression of the reset button shall not cause automatic reset of the contact(s). 7.2 Starters shall be furnished with three overload r

21、elays mounted in a single assembly. 7.3 Overload relays shall be of the manual reset type. Combination manual-automatic reset types are not acceptable. 7.4 A readily visible indicator shall be provided to indicate the tripped position of the overload. Manipulation of the indicator shall not adversel

22、y affect operation of the overload assembly as described in 7.1. FORD MANUFACTURING STANDARDS EC1 NEMA AC MOTOR STARTERS, ELECTRO-MECHANICAL TYPE, EC1 DECEMBER 1992 REQUIREMENTS AND TESTS Page 4 7.5 Provision shall be made to add, remove, or replace any overload relay or assembly without removing or

23、 disturbing other starter components. 7.6 Temperature compensated type relay assemblies and heater elements should be available from each approved starter manufacturer but shall be furnished only when specified. 7.7 Provision shall be made on the overload relay assembly for a normally open contact i

24、n addition to the regular normally closed contact. The normally open contact is used for as a signal to indicate the tripped condition of the overload assembly. The normally open contact shall remain closed until the relay is reset. Also see 11.4.1. 7.8 The manufacturer shall have available a line o

25、f separately mounted overload relay assemblies for use in multiple motor starting. 8. STARTER SOLENOID COILS: 8.1 Starter solenoid coils shall be encapsulated. 8.2 Coils shall conform to all heat rise, voltage range of operations, and other requirements outlined in NEMA Standard ICS2. 8.3 Coils shal

26、l be identified as specified in 9.2. 8.4 Only one size solenoid coil is acceptable for any contact combination on a given size starter. 8.5 The coil should be replaceable from the front without requiring major disassembly of the starter or removal of wiring other than the coil leads. 9. IDENTIFICATI

27、ON: 9.1 The starter (contactor assembly) shall be equipped with a nameplate listing the manufacturers name or trademark, model or catalog number, rating size and date of manufacture. The date shall be stamped with the date of manufacture using month and year. The date should be in a form which is re

28、cognizable (e.g., 2-81). 9.2 Starter solenoid coils shall be identified with the manufacturers name or trademark, catalog or replacement part number, voltage and frequency. FORD MANUFACTURING STANDARDS w-II- EC1 NEMA AC MOTOR STARTERS, ELECTRO-M DECEMBER 1992 REQUIREMENTS AND TESTS “: ,: . -w=- EC1

29、Page 5 10. COMBINATION MOTORS STARTERS: 10.1 10.1.1 10.1.2 10.2 10.2.1 10.3 10.3.1 10.4 10.4.1 10.4.2 10.5 10.5.1 REQUIREMENTS: The starter and overload assembly in combination motor starters shall comply with the requirements listed in Sections 1 through 9. Combination starters shall include a diag

30、ram of the starter wiring which shall be affixed to the inside of the door. The identification of each terminal, conductors, etc., shown on the diagram shall agree exactly with that of the combination starter. A list of overload elements and their ratings suitable for use with the starters shall als

31、o be shown. ENCLOSURES: ENCLOSURES FOR COMBINATION MOTOR STARTERS SHALL BE NEMA TYPE 12. RESET BUTTON: Combination starters shall have the overload reset internal to the enclosure except for those starters supplied to facilities in the State of California. DISCONNECTING MEANS: The disconnecting mean

32、s shall conform to Ford Manufacturing Standard EXl, Section E3 and to Ford Manufacturing Standard ES20. The handle assembly for the disconnect shall not be mounted on the door. When the door is open, it shall not be possible to close the disconnect without first operating the door interlock. When di

33、sconnect or molded case switches are furnished, they shall be of the fusible type, suitable for dual element fuses. Size 4 and larger should be equipped with a breaker. Provisions shall be made to lock the disconnect operating mechanism only in the “OFF“ position. THE CONTROL TRANSFORMER: The contro

34、l transformer shall conform to NEMA Standard ST-l, Part 3, Control Transformers; windings shall be copper and the transformer rated 55 C rise. Protection for the transformer shall be separately mounted. If a fuse is used, it shall be a standard NEC, dual element type rated 250 volts. FdRD MANUFACTUR

35、ING STANDARDS EC1 NEMA AC MOTOR STARTERS, ELECTRO-MECHANICAL TYPE, EC1 DECEMBER 1992 REQUIREMENTS AND TESTS Page 6 .: . *i : ,I - 10.6 GASKETS: 10.6.1 Door sealing gaskets shall conform to Ford Manufacturing Standard EXl, Section E17. 11. TEST PARAMETERS: 11.1 11.1.1 11.2 11.2.1 11.2.2 11.3 11.3.1 1

36、1.3.2 11.3.3 11.4 11.4.1 SIZES: Tests are limited to open type, NEMA sizes 1 and 3, representative of the range of starters 1 through 5. TYPES: Starters tested shall be of the reversing type and include both mechanical and electrical interlocks. Mechanical and electrical interlocks (auxiliary contac

37、t assemblies) shall be tested concurrently. BOUNCE TESTS: Starters shall be tested, as received, for bounce of both the power and auxiliary contacts. The bounce test shall be repeated upon completion of the electrical life tests outlined in 11.5. The contact(s), which had carried a load in the life

38、test (11.5.1), shall be tested. The starter shall be cycled for 50 operations prior to testing. The bounce test shall be conducted with a non-inductive 1K load (see Figure 1) at 115 volts DC. The bounce is determined by averaging 50 contact closures (random rate). TOTAL BOUNCE (PRIMARY PLUS SECONDAR

39、Y) SHALL NOT EXCEED: 20 milliseconds for power contacts. 15 milliseconds for auxillary contacts. These values apply to NEMA sizes 1 through 3 and the above values shall apply both before and after the life cycle test specified in 11.5.1. VIBRATION TESTS: STARTERS SHALL BE SUBJECTED TO THE FOLLOWING

40、CONDITIONS IN EACH OF THREE MUTUALLY PERPENDICULAR AXES: FORD MANUFACTURING STANDARDS EC1 NEMA AC MOTOR STARTERS, ELECTRO-MECHANICAL TYPE, DECEMBER 1992 REQUIREMENTS AND TESTS Xp_yP EC1 Page 7 Frequency range: S-60 Hz, Sweep time: 5 minutes, logarithmic ramp Excursion: 0.02 inches (0.5 mm) peak to p

41、eak Duration: 30 minutes in each plane The total loading shall not exceed 5.5 Gs for a maximum of one minute. Normally open contacts shall not close and normally close contacts shall not open for more than 2 milliseconds. This test shall include the overload relay assembly. 11.5 ELECTRICAL LIFE TEST

42、S: 11.5.1 Life tests are conducted after completion of the contact bounce and vibration tests. Reversing starters are tested for the following mechanical and electrical life. The starters shall pass this requirement without any failure, adjustment or repair. The test shall be conducted at a rate of

43、85 operations per minute for each contactor of reversing sizes 1 and 2, and at 25 operations per minute for size 3 starters. NEMA Size Millions of Cycles 1 10 2 10 3 5 11.5.2 11.5.3 11.5.4 11.5.5 Life tests are conducted in a NEMA type 12 enclosure, at a temperature of 160 F (71 C). Tests shall be c

44、onducted on reversing starters, with nominal 115 volts ac (60 Hz) or 24 volts dc applied to the solenoid assemblies. Also see 3.1.2. The tests are specified in 11.5.2 and the fidelity test specified in 11.5.4 are conducted simultaneously. One power contact on the forward starter, one power contact o

45、n the reversing starter and two auxiliary contacts, one normally open and one normally closed, are connected to separate inductive loads of 7.5 amperes inrush and 1.2 amperes sealed. One normally open and one normally closed auxiliary contact shall be tested for fidelity using a relay coil load of 4

46、0 milliamperes at 115 volts ac (60 Hz). See Figure 2 for a typical hookup. Before starters will be accepted for retest, the supplier shall provide evidence of appropriate modifications or redesign which precludes a previous failure. m 9009LbCl 0053359 745 - FORD MAJ!TUFACTURING STANDARDS EC1 NEMA AC MOTOR STARTERS, ELECTRO-MECHANICAL TYPE, EC1 DECEMBER 1992 REQUIREMENTS AND TESTS Page 8 ,: . 7“. . FIGURE 1 CONTACT UNDER TEST -7 1K 115 y gc NON-IiDiJCTIVE I P TO MEASURING INSTRUMENT FIGURE 1