Specifications

20
The emergency stops are located in cabinets close to the machines and close to the operators. As the use of
intermediate relays is prohibited, the solution of a safety function block is essential in the case of a multiple
stops command.
To cover most situations, three basic diagrams are offered:
Conventional diagram b
Generally it comprises a contactor, a variable speed drive, or a soft starter optionally associated with thermal
protection.
A second contactor KM_A, in series with KM_1 and 2, makes it possible to cover all the categories (conforming
to EN ISO 13849-1)
The PLC receives information from the safety XPS block and acts on the starter (contactors, speed variator....)
via the application.
Whatever the mode, local or remote, the XPS retains priority. Resetting cannot be performed if KM1 and kM2
are closed.
This diagram covers the structures including the products:
ATS48
ATV31
TeSys-T
LRD
Emergency
stop circuits
recommendation
Introduction
GV2_1
GV2_2
KM_1
KM_2
ATS or
ATV
Emergency
XPS
PLC
Security
active
Reset
Power off
KM_A
Off
power:
Ethernet
ATS or
ATV
3-Application design
Hardware design
The operating mode described above requires a wiring design for an emergency stop circuit and motor control
device.
The following paragraphs provide recommendations for developing a consistent wiring solution.
Safety requirements impose constraints to protect people and the environment. We recommend measures
against electrical risks which are dened in IEC 60204-1. This standard species in particular the emergency
stop operations.