FORD EA3-1995 OPERATOR CONTROL DEVICES MECHANICAL AND ELECTRONIC PALM BUTTONS《操作员控制装置的机械和电子手掌按钮》.pdf

1、 Manufacturing StandardsFord Motor Company199503 OPERATOR CONTROL DEVICES EA3MECHANICAL AND ELECTRONIC PALM BUTTOMSEngineering Standards theword “Should“ as a recommendation.2. REFERENCE STANDARDS: Whenever a specific standard is mentioned in thisStandard, it is understood it will be the latest revi

2、sion thereof unlessotherwise specified.2.1 Ford Motor Company - Manufacturing Standards EA1, EA2, andapplicable portions of EC2, EL3, EL3X, ES2, and EX12.2 INDUSTRY STANDARDS:2.2.1 Code of Federal Regulations, Department of Labor, OccupationalSafety and Health Administration, 29 CFR 1910 (OSHA),part

3、icularly sections:1910.211 for Definitions1910.212 for machine and point of operation guarding1910.217 for Control ReliabilityManufacturing StandardsFord Motor Company199503 OPERATOR CONTROL DEVICES EA3MECHANICAL AND ELECTRONIC PALM BUTTOMSEngineering Standards EC2, 4.; and ES2,7.5.Manufacturing Sta

4、ndardsFord Motor Company199503 OPERATOR CONTROL DEVICES EA3MECHANICAL AND ELECTRONIC PALM BUTTOMSEngineering Standards OSHA 1910.217(13) “Control Reliability“; and ANSIB11.19, 4.2.3.2.8 and E5.5 “Control Reliability.“ Thisincludes, but is not limited to a mechanical linkage betweencontacts on an ele

5、ctro-mechanical relay to prevent itsoperation should any contacts become welded.Manufacturing StandardsFord Motor Company199503 OPERATOR CONTROL DEVICES EA3MECHANICAL AND ELECTRONIC PALM BUTTOMSEngineering Standards & Printed copies are uncontrolled.Systems Engineering (ESSE) Page 7 of 83.2.6 RELAYS

6、 USED IN UNITS: Relays shall be used as the outputdevice in Units and shall be “off-the-shelf“ commonlyavailable types, for ease of replacement (if design permitssuch replacement). Special types which cannot be purchasedfrom U.S. electrical/electronic distributors shall not beused.3.2.7 CONTACT CONF

7、IGURATION: Units shall not contain any fuses orovercurrent protection in the output circuits. Unit shallutilize isolated contacts for output signals. Unit shallprovide at least one (1) normally open and one (1) normallyclosed contact. Units with (2) normally open and (2) normallyclosed contacts shal

8、l be available as an option.3.2.8 CONTACT OPERATION AND RATINGS: Unit shall have no more than50ms of delay from operator actuation to output closed, and nomore than 30ms of delay from operation deactuation to outputopen. Contact rating shall meet the requirements of NEMA ICS2-216.22 “Heavy Duty Push

9、buttons and Selector Switches -Contact Ratings.“ In general, the Unit shall be capable ofenergizing a Ford-approved four-pole, industrial machine toolrelay at a rate of at least 20 operations per minute, 50% dutycycle, and continuous operation under worst case voltages asdefined in Section 3.2.1 of

10、this Standard. Suppliers shallclearly define and state the load ratings for inrush current,make and break, for both resistive and reactive loads.3.2.9 CONTACT LIFE AND BOUNCE: Units shall have a minimum contactlife of 5 million operations under Suppliers stated fullload. Units shall be tested for co

11、ntact bounce both before andafter completion of all other tests required in this Standard.The Units shall pass the Contact bounce tests in Ford StandardEC2, section 8.4.3.2.10 ACTUATION INDICATORS: Electronic Units shall have indicators,which do not protrude above the enclosure for:(1) Power is On (

12、2) Unit is Actuated (3) Optionally: Unit hasfaulted (separate indicator or alternate flashing ofindicators for (1) and (2) is acceptable)3.2.11 SERIES AND PARALLEL CIRCUITS: Two Units shall be capable ofbeing wired in series or parallel, under worst case conditionsas specified in this Standard, with

13、out affecting the properoperation of the Relay or PLC control circuit (load) to whichthey are connected. Any limitations shall be clearly definedand stated by the Supplier.Manufacturing StandardsFord Motor Company199503 OPERATOR CONTROL DEVICES EA3MECHANICAL AND ELECTRONIC PALM BUTTOMSEngineering St

14、andards & Printed copies are uncontrolled.Systems Engineering (ESSE) Page 8 of 83.2.12 GROUNDING PROVISIONS: Each Unit shall be provided withgrounding provisions per U.L. 508, para. 48. Grounding screwsor conductors shall be green in color.4. |INSTALLATION REQUIREMENTS:4.1 | WET AREA APPLICATIONS: E

15、lectronic palm buttons, whether used singly| or in pairs, shall not be used wherever inadvertent actuation from| liquids could occur during normal operations. Ford-approved,| electromechanical palm buttons should be used for all wet area| applications.| NOTE: Denotes area of change in previous issue.|