138 Safe torque off function
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 60204-1:2006 + AC:2010.
Compliance with the European Machinery Directive
See section Compliance with the European Machinery Directive on page 128.
Wiring
The following diagrams show examples of Safe torque off wiring for
• a single drive (page 139)
• multiple drives (page 141)
• multiple drives when an external 24 V DC power supply is used (page 142).
For drives with option +L537+Q971
, see CPTC-02 ATEX-certified thermistor protection
module, Ex II (2) GD (+L537+Q971) user's manual (3AXD50000030058 [English]).
For information on the specifications of the STO input, see section Technical data on page
87.
Activation switch
In the wiring diagrams below, the activation switch has the designation (K). This
represents a component such as a manually operated switch, an emergency stop push
button switch, or the contacts of a safety relay or safety PLC.
• If a manually operated activation switch is used, the switch must be of a type that can
be locked out to the open position.
• The contacts of the switch or relay must open/close within 200 ms of each other.
• An CPTC-02 option module can be used. For more information, see.section CPTC-02
ATEX-certified thermistor protection module, (external 24 V AC/DC and isolated PTC
interface) on page 168.
Cable types and lengths
We recommend double-shielded twisted-pair cable.
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 61511:2003 Functional safety – Safety instrumented systems for the process industry
sector
IEC/EN 61800-5-2:2007 Adjustable speed electrical power drive systems –
Part 5-2: Safety requirements – Functional
EN 62061:2005 + A1:2013
IEC 62061:2005 + A1:2012
Safety of machinery – Functional safety of safety-related electrical,
electronic and programmable electronic control systems
EN ISO 13849-1:2008 +
AC:2009
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
Standard Name
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