Table of Contents
PACMotion™ PSD Installation and User Manual
GFK-3168A
4.15.4
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).
Note: 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
requirements:
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.
4.15.5
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.
Note: 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 application, then the
Emergency Off function must be replaced by other measures (for example by protection against
direct touching).
4.16
Safe Torque Off (STO)
The STO safety implementation on the PSD is qualified. The safety circuit implementation used for
the safety function "Safe Torque Off" in the drive is suited for SIL 2 according to IEC 62061 and PLd /
CAT3 according to ISO 13849-1.
4.16.1
IC830DP003 up to IC830DP024
An additional digital input (STO) releases the power output stage of the drive as long as a 24 V
signal is applied to this input. If the STO input goes open-circuit, then power will no longer be
supplied to the motor, and the drive will lose all torque and coast to a stop.
Note: This input is not compatible with IEC 61131-2. You can thus achieve a category 0 stop (➜ #
52) by using the STO input without switching a mains contactor.
Technical Description and Data
Section 4
September 2020
35
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