AS NZS IEC 60947.5.5 pdf download

AS NZS IEC 60947.5.5 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).
3 Definitions
For the purpose of this section of IEC 60947-5, the following definitions apply in addition to those given in IEC 60947-1 and in IEC 60947-5-1 .3.1 emergency stop (function or signal) function or signal which is intended: – to avert or to reduce hazards to persons, damage to machinery or to work in progress; – to be initiated by a single human action. [ISO/IEC 1 3850:3.1 , modified] 3.2 emergency stop device a manually operated control circuit device used to initiate an emergency stop function [ISO/IEC 1 3850:3.2, modified] NOTE An emergency stop device may also provide auxiliary functions, for example for redundancy and/or for signalling through additional contact element(s). Such additional contact(s) may be normally open and/or normally closed. 3.3 actuating system (of an emergency stop device) the mechanical parts which transmit the actuating force to the contact elements [IEV 441 -1 5-21 modified] 3.4 actuator (of an emergency stop device) the part of the actuating system which is actuated by a part of the human body [IEV 441 -1 5-22 modified] NOTE 1 Examples of an actuator may be a button, a wire, a rope, a bar, a foot pedal. 3.5 rest position the position of an emergency stop device, or of a part of it, which has not been actuated NOTE In rest position, the machine (or equipment) may work. 3.6 actuated position the position of an emergency stop device, or of a part of it, after it has been actuated NOTE In the actuated position of the emergency stop device the machine (or equipment) remains at rest.3.7 latching (of an emergency stop device) function or means which engages and maintains the actuating system in the actuated position until reset by a separate manual action 3.8 resetting (of an emergency stop device) manual action to return the actuating system of the emergency stop device from the actuated position to the rest position NOTE Examples of resetting include the rotation of a key, or of the actuator, pulling the actuator or pushing a special reset button. 3.9 direct opening action (positive opening action) (of a contact element) the achievement of contact separation as a direct result of a specified movement of the switch actuator through non-resilient members (e.g. non dependent upon springs) [K.2.2 of IEC 60947-5-1 ] 3.1 0 trip wire switch rope pull switch pull cord operated switch emergency stop device in which the actuator is a rope, a wire or similar means
4 Marking and product information
4.1 General Information for installation, operation, maintenance and/or periodic testing shall be provided when necessary on or with the emergency stop device. The verification of clause 4 shall be conducted according to 7.2.1 . NOTE 1 In certain circumstances, it may be necessary to provide additional information, for example: – by labels, – by marker flags attached to wires or ropes to improve their visibility, – by the graphical symbol 6041 7-IEC-5638 (see Table 6 of IEC 61 31 0-1 ). NOTE 2 See also 9.2.5.4 of IEC 60204-1 . 4.2 Indications on buttons 4.2.1 Buttons used as actuators of an emergency stop device shall be coloured red. When a background exists behind the actuator, and as far as it is practicable, it shall be coloured yellow. 4.2.2 The direction of unlatching shall be clearly identified when resetting is achieved by rotation of the button. NOTE See also IEC 60073 and ISO 3864.