1、FORD MANUFACTURING STANDARDS ES5 JUNE 1995 CABLE PULL EMERGENCY STOP SWITCHES ES5 Page 1 1. SCOPE: 1.1 This Standard applies to cable pull (rope pull or safety tripwire) emergency stop switches and their installations, 1.2 REFERENCE STANDARDS: Switches furnished in accordance with this standard shal
2、l conform as a minimum with - and be certified or listed to - the latest revisions of the following, and shall bear the marks of the testing agencies to standards indicated by an asterisk (*): * Underwriters Laboratories (U.L.) 508, “Industrial Control Equipment.“ * Canadian Standards Association (C
3、SA) C22.2, No. 14-M91 “Industrial Control Equipment“. (for installations in Canada). National Electrical Manufacturers Association (NEMA) . . . . ICS 2-125, “Contacts For Control Circuit Devices.“ American National Standards Institute (ANSI) A17.1. * British Standards Institute, BS 5304, “British St
4、andards Code of Practice, Safety of Machinery.“ * International Electrotechnical Commission (IEC), Publications 68-2-6, IEC 337-1, and IEC 947-5-l. European Committee for Electrotechnical Standardization (CENELEC), EN 50013, “Low Voltage Switchgear and Controlgear for Industrial use Terminal Marking
5、 and Distinctive Number for Particular Control Switches“, EN 60204-1, “Safety of Machinery - Electrical Equipment of Machines, Part 1.“ * Verband Deutsche Elektrotechniker (VDE) 0660-207 Code of Federal Regulations, Department of Labor, Occupational Safety and Health Administration, 29 CFR 1910 (OSH
6、A), Sections indicated. * Berufsgenossenschaftliches Institut fur Arbeitssicherheit (BIA), St. Augustin (provide test certification and the required “BG“ mark). (Other requirements contained in international standards pertaining to these switches, which are not indicated above, shall also apply. 1 1
7、.3 DEFINITIONS: 1.3.1 Mandatory requirements of this Standard are characterized by the use of the work “shall“ and preferred items by the used of the word “should.“ m 90091b0 005L5b7 b83 m FORD MANUFACTURING STANDARDS ES5 JUNE 1995 CABLE PULL EMERGENCY STOP SWITCHES ES5 Page 2 1.3.2 A TRIP is define
8、d as the transition of normally-closed contacts to an open state and normally-open contacts to a closed state inside the switch. 1.3.3 A SWITCH is understood to mean a cable pull switch furnished under this Standard. 1.3.4 The terms, CABLE, ROPE, PULL COED and TRIPWIRE are used interchangeably and a
9、re all understood to be a coated, aircraft-type cable in accordance with Section 7 and its subsections below. 2. TRIPPING REQUIREMENTS: The safety system consisting of the switch, its attached pull cord and supporting hardware, etc. shall: 2.1 Trip due to a slack or broken pull cord. 2.2 Trip whethe
10、r the pull cord is pushed or pulled in any direction. 2.3 Require no more than 125 N (28 lbs) of force applied perpendicular to the pull cord in or the second set should be identified as 23-24 for the normally-open and 11-12 for the positive opening, normally-closed. 4.5.1 Terminals shall accept wir
11、e sizes from 14 through 24 AWG and have captive clamps. 4.5.2 A grounding terminal shall be provided and properly marked as such. 5. SWITCH ENCLOSURE: 5.1 ENVIRONMENTAL RATING: The switch enclosure shall be rated NEMA Type 4, or Type 12 (IP65) or higher, and have at least two l/2-in or larger, NPT o
12、r threaded cable entries. 5.2 Approved switches shall be available in both right- and left-hand cable mount versions. 5.3 Switch cover hardware shall be captive. m 9009160 U0515b=l q5b m FORD MANUFACTURING STANDARDS ES5 JUNE 1995 CABLE PULL EMERGENCY STOP SWITCHES ES5 Page 4 6.2 6. SWITCH ACCESSORIE
13、S: 6.1 LOCK-OUT ACCESSORIES PROHIBITED FOR USE: Switches shall not be used for lock-out and therefore shall not be fitted with any device for this purpose. PILOT LIGHTS: Approved switches shall have RED pilot lights as an available option which mount into holes in the switch body or cover provided f
14、or this purpose. Pilot lights shall be available in 24 and 120 Volt versions and have a 2,000 hour life as a minimum. 6.3 RESET PUSHBUTTONS : shall be booted (see Section 3.2 above) and shall be Blue in color. 7. INSTALLATIONS: 7.1 7.2 7.3 7.3.1 7.3.2 7.3.3 7.3.4 GENERAL: Where more than four emerge
15、ncy stop pushbuttons are required a cable pull emergency stop switch is preferred. The pull cord(s) shall be accessible from any position where an emergency stop function is required. MOUNTING LOCATION: The switch shall be installed so automation moves in a direction away from the switch. For exampl
16、e, the switch shall be upstream from the direction of travel for a conveyor. OTHER REQUIREMENTS: The switch and its associated pull cord and all hardware shall be installed in accordance with its manufacturers instructions, subject to the following limitations and additional requirements: HARDWARE:
17、All hardware shall be steel with corrosion resistant finish. CABLE TYPE: The pull cord shall consist of a minimum of 3 mm (l/8 in) diameter, 19-strand, aircraft type, corrosion-resistant steel cable with bright RED plastic coating. Maximum permissible elongation shall not exceed 0.7 millimeters/mete
18、r (0.013 inches/foot). LENGTH: The pull cord connected to any switch shall not exceed 23 meters (75 feet) in total length. MOUNTINGHEIGHT: The pull cord shall be installed from 0.9 to 1.8 meters (3 to 6 feet) above the level on which the operator employee stands. (ref. OSHA 1910.216 (b) (1) (iii).)
19、FORD MANUFACTURING STANDARDS ES5 JUNE 1995 CABLE PULL EMERGENCY STOP SWITCHES ES5 Page 5 7.3.5 SUPPORTS: A closed eyebolt shall be installed no farther than 10 centimeters (4 inches) from the switch, directly in line with the centerline axis of the plunger-actuator. The pull cord (cable) shall be su
20、pported thereafter at frequent intervals, not exceeding 3 meters (10 feet) between supports, using closed eye bolts and/or pulleys with closed (unopenable) side plates. Supports shall be designed and installed to minimize cable wear and to assure tripping requirements under Section 2 above are not e
21、xceeded. Pulleys are recommended to reduce frictional forces, especially at turns. Where pulleys are used, a closed eyebolt should be installed within 10 centimeters (4 inches) on both sides of the pulley to maintain proper cable alignment. 7.3.6 7.3.7 NUMBER OF BENDS: Pull cord bends shall not exce
22、ed the equivalent of two quarter bends (180 degrees total) where attached to one switch. A total of four quarter bends (360 degrees) shall be permitted if the pull cord is attached to a switch at both ends. TENSIONING DEVISES AND ATTACHMENTS: The pull cord shall be installed with a turnbuckle locked
23、 with ham nuts at one end, or where a switch is installed at both ends of the same cable the turnbuckle may be located in the middle of its length. The cable shall be fastened to itself at all terminations with two forged steel wire rope clips (clamps) with grooved channel bases. It may be necessary
24、 to remove the cable sheath at its terminations to reduce slippage. A steel rope thimble shall be used inside all cable terminations to protect the cable from chafing. 7.4 PARTICULAR APPLICATIONS: 7.4.1 CONVEYORS: Belt conveyor shall have an emergency stop cable extending its entire length, or conveniently located emergency stop buttons within 10 feet of each workstation. (Ref. OSHA 1910.261 (c) (15) (iv).)
