Introduction to the guide 7
Introduction to the guide
Contents of this chapter
This guide contains information on implementing an ATEX-compliant protective circuit
using the Safe torque off feature, along with a motor thermal protection method example,
and the ATEX certification documents.
Applicability
This guide is applicable to the ACS850 drives with the ATEX-certified Safe disconnection
function (option +Q971).
The Safe disconnection function introduced in this guide is certified with a EU-type
examination certificate as protective system in accordance with the ATEX product directive
2014/34/EU (previously 94/9/EC).
Target audience
This guide is intended for personnel who install, start-up, use and service the ATEX-
certified Safe disconnection function (option +Q971) of the drive. Read the manual before
working on the drive. Your are expected to know the fundamentals of electricity, wiring,
electrical components, electrical schematic symbols and ATEX/Ex regulations.
Only qualified specialists are allowed to install, control and maintain the ATEX-certified
Safe disconnection function. See EN IEC 60079-14; follow all safety regulations required
with applications of motors for explosive atmospheres (later referred as Ex motors in this
guide) in Zone 1/21 (equipment category 2), or Zone 2/22 (equipment category 2 or 3).
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