218 Safe torque off function
The Safe torque off function of the drive complies with these standards:
The function also corresponds to Prevention of unexpected start-up as specified by
EN 1037:1995 + A1:2008 and Uncontrolled stop (stop category 0) as specified in
EN/IEC 60204-1.
Compliance with the European Machinery Directive
See section EU Declaration of Conformity (Machinery Directive) on page 202.
Wiring
The following diagrams show examples of Safe torque off wiring for
• a single drive (page 220)
• multiple drives (page 221)
• multiple drives when an external 24V DC power supply is used (page 222).
For drives with option +L537+Q971, see ATEX-certified Safe disconnection function, Ex II
(2) GD for ACS880 drives (option +Q971) application guide (3AUA0000074343 [English]
and FPTC-02 ATEX-certified thermistor relay module, Ex II (2) GD (+L537+Q971) for
ACS880 drives user's manual (3AXD50000027782 [English])
For information on the specifications of the STO input, see section Default I/O connection
diagram on page 108 (external control unit) or 123 (internal control unit, option +P905).
Standard Name
EN 60204-1:2016 Safety of machinery – Electrical equipment of machines – Part 1: General
requirements
IEC 61326-3-1:2008 Electrical equipment for measurement, control and laboratory use – EMC
requirements – Part 3-1: Immunity requirements for safety-related
systems and for equipment intended to perform safety-related functions
(functional safety) – General industrial applications
IEC 61508-1:2010 Functional safety of electrical/electronic/programmable electronic safety-
related systems – Part 1: General requirements
IEC 61508-2:2010 Functional safety of electrical/electronic/programmable electronic safety-
related systems – Part 2: Requirements for
electrical/electronic/programmable electronic safety-related systems
IEC 61511-1:2016 Functional safety – Safety instrumented systems for the process industry
sector
IEC 61800-5-2:2016
EN 61800-5-2:2007
Adjustable speed electrical power drive systems –
Part 5-2: Safety requirements – Functional
IEC 62061:2015
EN 62061:2005
+AC:2010+A1:2013+A2:2015
Safety of machinery – Functional safety of safety-related electrical,
electronic and programmable electronic control systems
EN ISO 13849-1:2015 Safety of machinery – Safety-related parts of control systems – Part 1:
General principles for design
EN ISO 13849-2:2012 Safety of machinery – Safety-related parts of control systems – Part 2:
Validation
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