222 Safe torque off function
Standard
IEC 61508-1:2010
IEC 61508-2:2010
IEC 61511-1:2016
IEC 61800-5-2:2016
EN 61800-5-2:2007
IEC 62061:2015
EN 62061:2005
+AC:2010+A1:2013+A2:2015
EN ISO 13849-1:2008 +
AC:2009
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 60204-1:2006 + AC:2010.
Compliance with the European Machinery Directive
See section
Compliance with the European Machinery Directive
Electrical planning instructions for ACS880 multidrive cabinets and modules
(3AUA0000102324 [English]).
Wiring
The following diagrams present examples of Safe torque off wiring for
•
a single drive (page 223)
•
multiple drives (page 225)
•
multiple drives when an external 24V DC power supply is used (page 226)
For information on the specifications of the STO input, see section
diagram
on page 108.see
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.
•
An FSO-xx safety functions module or an FPTC-0x thermistor protection module can
also be used. For more information, see the module documentation.
Cable types and lengths
We recommend double-shielded twisted-pair cable (see page 73).
Name
Functional safety of electrical/electronic/programmable electronic safety-
related systems – Part 1: General requirements
Functional safety of electrical/electronic/programmable electronic safety-
related systems – Part 2: Requirements for
electrical/electronic/programmable electronic safety-related systems
Functional safety – Safety instrumented systems for the process industry
sector
Adjustable speed electrical power drive systems –
Part 5-2: Safety requirements – Functional
Safety of machinery – Functional safety of safety-related electrical,
electronic and programmable electronic control systems
Safety of machinery – Safety-related parts of control systems – Part 1:
General principles for design
Safety of machinery – Safety-related parts of control systems – Part 2:
Validation
on page 189. See
Default I/O connection