Beckhoff AX2500 Series, Assembly, Installation, Setup

Page: 21 / 81

2.13.2
Emergency stop methods
The Emergency Stop function is defined in EN 60204 (VDE 0113), Para. 9.2.5.4.
In addition to the requirements for Stop, the Emergency Stop must fulfill the following
requirements:
l it must have priority over all other functions and controls in all operating situations
l
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 (e.g. by
using
mechanical latching devices that do not require an external supply of energy, by
counter-current braking in Stop Category 1)
l
the reset must not initiate a restart
If necessary, provision must be made for the additional connection of emergency stop
devices (see EN 60204 Requirements for emergency stop devices).
The Emergency Stop must be effective as a stop of either Category 0 or Category 1.
The Emergency Stop Category must be determined by a risk evaluation of the machine.
Category 0
Only hard-wired electromechanical components may be used for an Emergency Stop
function to Category 0. The action must not depend on switching logic (hardware or soft-
ware) or on the transmission of commands through a communications network or a data
connection.
In multi-axis systems using a coupled DC Bus link the motor cable must also be discon-
nected by a changeover switch (a contactor, such as Siemens type 3RT1516-1BB40) and
short-circuited by resistors wired in a star configuration.
Category 1
For Emergency Stop Category 1 the final disconnection of the energy supply to the drive
machinery must be ensured by electromechanical components. Supplementary Emer-
gency Stop devices may be plugged in.
Implementation of the Emergency Stop function :
You can find wiring recommendations in our application note
“Stop and Emergency Stop functions"
AX2500 Installation Manual 21
Beckhoff
02/06
Technical description