AS NZS IEC 60947.5.5:2015 pdf free download – Low-voltage switchgear and controlgear Part 5.5: Control circuit devices and switching elements—Electrical emergency stop device with mechanical latching function.
6.1.4 Vibration or shocks shall not cause the opening of the contacts in the closed positionor 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.
6.2Latching
6.2.1 In accordance with 4.4.4 of ISO 13850*, when the emergency stop signal has beengenerated during actuation of the emergency stop device, the emergency stop function shallbe maintained by latching of the actuating system. The emergency stop signal shall bemaintained until the emergency stop device is reset (disengaged). It shall not be possible forthe emergency stop device to latch-in without generating the emergency stop signal.
ln case of failure in the emergency stop device (including the latching means), the generationof the emergency stop signal shali 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 underconditions,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.
6.3Additional 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 buttonin 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 fromthe inside of the enclosure only, or from the outside of the enclosure by use of a tool intendedfor that purpose.
This shall be verified by inspection.
6.4Additional 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 4.5.2of ISO/IEC 13850.
The tests shall be conducted according to 7.2 and 7.3.
6.4.2When 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 pullingforce necessary for generating the emergency stop signal;
the perpendicular deflection of the wire or rope necessary for generating the emergencystop signal shall be less than 400 mm;
the breaking or disengagement of the wire or rope shall generate the emergency stopsignal;
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 takeninto account.
The tests shall be conducted according to 7.2.1.
6.5Additional requirement for footswitches
A pedal (footswitch) type emergency stop device shall have no cover.
The test shall be conducted according to 7.2.1.
7 Testing of the mechanical design
7.1General
ln accordance with 8.1.1 and 8.1.2 of lEC 60947-1, type tests shall be made to provecompliance with the requirements of clauses 4,5 and 6.
An emergency stop device may have combinations of both main and auxiliary contacts.The tests given in 7.5 and 7.6 are to verify that all these contacts are not adversely affectedby mechanical shocks.
Some tests,for example based on visual inspection,or by checking the literature providedwith the emergency stop device, require only one sample.
For the tests described in 7.3.3,7.4，7.5,7.6 and 7.7, three identical samples of emergencystop device shall be selected, and each sample shall be subjected successfully to thesequence of tests, in the order given in this clause.AS NZS IEC 60947.5.5 pdf download.