S748-772 Instructions Manual | 7 Technical description
7.8.2 Emergency Stop
The Emergency Stop function is used for the fastest possible shutdown of the machine in a
dangerous situation. The Emergency Stop function is defined by IEC 60204. Principles of
emergency stop devices and functional aspects are defined in ISO 13850.
The Emergency Stop function will be triggered by the manual actions of a single person. It
must be fully functional and available at all times. The user must understand instantly how to
operate this mechanism (without consulting references or instructions).
The Stop Category for the Emergency Stop must be determined by a risk evaluation of the
machine.
In addition to the requirements for stop, the Emergency Stop must fulfil the following require-
ments:
Emergency Stop must have priority over all other functions and controls in all operating
modes.
The energy supply to any drive machinery that could cause dangerous situations must be
switched off as fast as possible, without causing any further hazards (Stop Category 0) or
must be controlled in such a way, that any movement that causes danger, is stopped as
fast as possible (Stop Category 1).
The reset must not initiate a restart.
Examples for implementation can be found in the KDN on page Stop and Emergency Stop
Function.
7.8.3 Emergency Off
The Emergency Off function is used to switch-off the electrical power supply of the machine.
This is done to prevent users from any risk from electrical energy (for example electrical
impact). Functional aspects for Emergency Off are defined in IEC 60364-5-53.
The Emergency Off function will be triggered by the manual actions of a single person.
The result of a risk evaluation of the machine determines the necessity for an Emergency
Off function.
Emergency Off is done by switching off the supply energy by electro-mechanical switching
devices. This results in a category 0 stop. If this stop category is not possible in the applic-
ation, then the Emergency Off function must be replaced by other measures (for example by
protection against direct touching).
40 Kollmorgen | kdn.kollmorgen.com | July 2019
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