UL 60947-5-5-2017 pdf free download

UL 60947-5-5-2017 pdf free download.Low-Voltage Switchgear and Controlgear— Part5-5: Control circuit devices and switching elements— Electrical emergency stop device with mechanical latching function.
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.
Cotresponds to 4.1.11 of EN 418.
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.UL 60947-5-5-2017 pdf free download.