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.
5 Electrical requirements
5.1 The utilization categories shall be AC-15 and/or DC-13 and/or DC-14 in accordance with IEC 60947-5-1.
5.2 All normally closed contact elements of an emergency stop device shall have a direct opening action (positive opening action), according to annex K of IEC 60947-5-1. The tests shall be conducted according to annex K of IEC 60947-5-1.
5.3 The degree of protection provided by the emergency stop device shall be stated by the manufacturer in accordance with annex C of IEC 60947-1.
5.4 Tests for electrical characteristics shall be conducted according to IEC 60947-5-1. NOTE Subclause 7.2.7 of IEC 60947-5-1 only applies to control switches suitable for isolation.
6 Mechanical requirements
6.1 General requirements
6.1.1 Means shall be provided to enable the emergency stop device to be securely installed in its intended mounting position. The test shall be conducted according to 7.2.1.
6.1.2 The emergency stop device shall meet the requirements of 7.3, 7.4, 7.5, 7.6 and, where applicable, of 7.7.5.
6.1.3 It shall be possible to operate and reset the emergency stop device under all normal service conditions. The test shall be conducted according to 7.2 to 7.4.
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 13850*, 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 Additional requirements for trip wire switches
6.4.1 The construction of the emergency stop device shall be such that: — the setting of the wire or rope, and subsequent adjustment, can be carried out without causing malfunction; and — the installation of the emergency stop device can fulfil the requirements of 4.5.1 and 4.5.2 of ISO/IEC 13850. The tests shall be conducted according to 7.2 and 7.3.
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 10 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.AS NZS IEC 60947.5.5 pdf download.