AS/NZS IEC 60947.5.5:2015 pdf download – Low-voltage switchgear and controlgear Part 5.5: Control circuit devices and switching elements—Electrical emergency stop device with mechanical latching function.
1 Scope This section of IEC 60947-5 provides detailed specifications relating to the electrical and mechanical construction of emergency stop devices with mechanical latching function and to their testing. This standard is applicable to electrical control circuit devices and switching elements which are used to initiate an emergency stop signal. Such devices may be either provided with their own enclosure, or installed according to the manufacturer’s instructions. This standard does not apply to: – emergency stop devices for non-electrical control circuit, for example hydraulic, pneumatic; – emergency stop devices without mechanical latching function. An emergency stop device may also be used to provide an emergency switching off function (see annex A). 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050(441 ):1 984, International Electrotechnical Vocabulary (IEV) – Chapter 441: Switchgear, controlgear, fuses Amendment 1 (2000) IEC 60068-2-1 :1 990, Environmental testing – Part 2: Tests – Test A: Cold Amendment 1 (1 993) Amendment 2 (1 994) IEC 60068-2-2:1 974, Environmental testing – Part 2: Tests – Test B: Dry heat Amendment 1 (1 993) Amendment 2 (1 994) IEC 60068-2-6:1 995, Environmental testing – Part 2: Tests – Test Fc: Vibration (sinusoidal) IEC 60068-2-1 1 :1 981 , Environmental testing – Part 2: Tests – Test Ka: Salt mist
6.1 .4 Vibration or shocks shall not cause the opening of the contacts in the closed position or the closing of the contacts in the open position, nor operation of the latching mechanism. The tests shall be conducted according to 7.5 and 7.6. 6.2 Latching 6.2.1 In accordance with 4.4.4 of ISO 1 3850 * , when the emergency stop signal has been generated during actuation of the emergency stop device, the emergency stop function shall be maintained by latching of the actuating system. The emergency stop signal shall be maintained until the emergency stop device is reset (disengaged). It shall not be possible for the emergency stop device to latch-in without generating the emergency stop signal. In case of failure in the emergency stop device (including the latching means), the generation of the emergency stop signal shall have priority over the latching function. The tests shall be conducted according to 7.2, 7.7.2 and 7.7.3. 6.2.2 The latching shall operate correctly when the emergency stop device is used under conditions, specified either in 7.4 or by the manufacturer, whichever is more severe. The test shall be conducted according to 7.3, 7.4, 7.5, 7.6 and 7.7. 6.3 Additional requirements for button type emergency stop device 6.3.1 The resetting of the latching means shall be by turning a key, by rotation of the button in the designated direction, or by a pulling motion. The test shall be conducted according to 7.2.1 and 7.2.2.1 . 6.3.2 The emergency stop device shall be so designed that removal of the actuator is from the inside of the enclosure only, or from the outside of the enclosure by use of a tool intended for that purpose. This shall be verified by inspection.
6.4.2 When the actuator is installed according to the instructions: – the perpendicular pulling force applied to the wire or rope necessary for generating the emergency stop signal (opening of the contacts) shall be less than 200 N; – the wire or rope shall resist a tension force 1 0 times higher than the perpendicular pulling force necessary for generating the emergency stop signal; – the perpendicular deflection of the wire or rope necessary for generating the emergency stop signal shall be less than 400 mm; – the breaking or disengagement of the wire or rope shall generate the emergency stop signal; The pulling force shall be applied at the mid-point of the length of the wire or rope. The tests shall be conducted according to 7.8.1 . 6.4.3 Changes in the length of the rope (for example temperature, age etc.) shall be taken into account. The tests shall be conducted according to 7.2.1 . 6.5 Additional requirement for footswitches A pedal (footswitch) type emergency stop device shall have no cover. The test shall be conducted according to 7.2.1 .