NameStandard
Functional safety of electrical/electronic/programmable electronic safety-
related systems – Part 1: General requirements
IEC 61508-1:2010
Functional safety of electrical/electronic/programmable electronic safety-
related systems – Part 2: Requirements for electrical/electronic/program-
mable electronic safety-related systems
IEC 61508-2:2010
Functional safety – Safety instrumented systems for the process industry
sector
IEC 61511-1:2016
Adjustable speed electrical power drive systems – Part 5-2: Safety require-
ments – Functional
IEC 61800-5-2:2016
EN 61800-5-2:2007
Safety of machinery – Functional safety of safety-related electrical, elec-
tronic and programmable electronic control systems
IEC 62061:2005 + A1:2012 +
A2:2015
EN 62061:2005 + AC:2010 +
A1:2013 + A2:2015
Safety of machinery – Safety-related parts of control systems – Part 1:
General principles for design
EN ISO 13849-1:2015
Safety of machinery – Safety-related parts of control systems – Part 2:
Validation
EN ISO 13849-2:2012
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 Compliance with the European Machinery Directive (page 169).
Wiring
The following diagrams present examples of Safe torque off wiring for
•
a frame n×R8i inverter unit (page 192)
•
multiple inverter units (page 194)
•
multiple inverter units when an external 24 V DC power supply is used (page 195).
For the specification of the STO input, see the control unit description.
￭ 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.
• In case 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.
￭ Cable types and lengths
• Double-shielded twisted-pair cable is recommended.
• Maximum cable lengths:
• 300 m (1000 ft) between activation switch [K] and inverter control unit
• 60 m (200 ft) between multiple inverter units
190 The Safe torque off function
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