1、 Printed copies are uncontrolled. Page 1 of 3 Standard Number w-ES15 Issue Date: 20021212 Global Manufacturing Standards Rev: SAFETY FOOT SWITCHES 1. 0 PURPOSE This Standard covers the basic requirements for the qualification and use of Safety Foot Switches with the intention of enhancing personnel
2、safety in accordance with all the relevant Corporate Safety Requirements as well as National and Local legislation. Notes: For use in Europe, the qualification required for foot switches is that they be “CE“ Marked ( ) to certify that their construction is in compliance with the appropriate European
3、 Standards (EN) or that specific third party certification as a product has been given. They shall be accompanied with an EC Declaration of Conformity. For use in North America, the qualification required for foot switches is that they be UL 508 Listed ( ) and CSA Certified ( ), to certify that thei
4、r construction is in compliance with the appropriate UL/CSA Test Reports. 2.0 REFERENCES IEC 60947-1 Low-voltage switchgear and controlgear - Part 1: General rules IEC 60947-5-1 Low-voltage switchgear and controlgear - Part 5-1 Control circuit devices and switching elements - Electromechanical contr
5、ol circuit devices EN 60447 Man Machine Interface (MMI) - Actuating Principles EN 418 Safety of machinery - Emergency Stop Equipment, functional aspects, Principles for design. VDE 0660-200 UL 508 CSA C22-2 No. 14 NF E 09-031 3.0 DEFINITIONS Positive Opening (Direct Opening) - In accordance with IEC
6、 60947-5-1, contacts Shall open even if welded and shall not rely on the use of springs or flexible links between the actuator and contacts. Type A - Foot switches designed for general applications Type B - Foot switches designed for specific control of presses, shears and similar machinery or equip
7、ment. Note: The application of all foot switches to control operations shall be approved Printed copies are uncontrolled. Page 2 of 3 Standard Number w-ES15 Issue Date: 20021212 Global Manufacturing Standards Rev: by the local safety department 4. TECHNICAL CONTENT 4.1 ENCLOSURES: 4.1.7. All enclosu
8、res and housings shall be suitable for the environmental conditions expected, but as a minimum, they shall be at least IP 65 ( NEMA 13 ) and utilise oil resistant gaskets. The foot switch enclosure shall be of metal and resist a dead load of at least 100Kg (250 lbs) without either deformation or the
9、 operation of the switch contacts. The enclosure shall also withstand the force from a 22.7 Kg (50 lbs) solid iron sphere dropped from a height of 1 metre (3 feet) without deformation or switch operation. 4.1.2. All Enclosures shall be provided with an earth (ground) termination screw inside having
10、a slotted hexagonal head and a wire clamp. In North America the screw shall be green in colour. 4.1.3. All type A foot switches shall be enclosed by guards or shields on the top and all sides except the one for foot insertion. Clearance dimensions shall be no less than those shown in figure 1. 4.1.4
11、. In addition to the guards provided on the top and all sides,Type B footswitches shall be provided with a door or safety cover on the foot insertion side or other Ford approved means to prevent accidental actuation when not in use. 4.1.5. The surface of the actuator pedal shall be of a non-slip mat
12、erial or construction. 4.1.6. Foot switches shall be finished with Yellow oil resistant enamel paint or other locally approved high visibility safety colour or material. 4.1.7. A cable entry hole shall be provided at the rear of the switch housing with a thread of 20 mm ( or inch NPT). 4.1.8. Foot p
13、edals shall have at least 10 mm ( inch ) travel before the contacts are operated. 4.2. SWITCH CONTACT ASSEMBLIES: 4.2.1. A single switch contact block shall provide at least two normally open and two normally closed positive opening contacts. All contacts shall be isolated with no common terminals.
14、Contact ratings shall meet the requirements of :- IEC AC13, DC13 and/or NEMA A300, Q300. The normally open contacts shall close and open simultaneously, as required for connecting the footswitch to a certified safety relay module. Printed copies are uncontrolled. Page 3 of 3 Standard Number w-ES15 I
15、ssue Date: 20021212 Global Manufacturing Standards Rev: 4.2.2. For type A applications, where no safety functionality is involved, one normally open contact and one normally closed contact may be provided; all of the other requirements apply. 4.2.3. Insulation voltage shall be to a minimum of 500 vo
16、lts with an impulse withstand voltage to 6 KV, insulation resistance shall be at least 25 M. 4.2.4. The terminations for wiring shall accommodate minimum wire sizes of 1.5 square mm. ( 16 AWG ). All wiring used shall be of highly flexible construction. Clamps, saddles or plates shall be included and
17、 the termination screw shall not bear directly on the wire. 4.2.5. Fast make, fast break snap action switch assemblies shall be provided. Extend top of Housing overFoot Pedal by 30 mm. Min.125 mm Min.150 mm Max.(internal)70 mm Min.85 mm Max.(internal)20 mm metric threadLeading edge of Foot Pedal75 mm. Min.Floor surfaceFigure 1.ClearanceDimensionsNote:Metric Conversion1 inch - 25.4 mm.
