ABB ACS880-04F, Hardware Manual, Page: 154 / 172

154 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 134 .
Wiring
The following diagrams present examples of Safe torque off wiring for
•
a single drive (page 155 )
•
multiple drives (page 157 )
•
multiple drives when an external 24V DC power supply is used (page 158 )
For information on the specifications of the STO input, see section Default I/O connection
diagram on page 89 .

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 can also be used. For more information, see the
FSO-xx module documentation.

Cable types and lengths
We recommend double-shielded twisted-pair cable (see page 65 ).
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 61511:2016 Functional safety – Safety instrumented systems for the process industry
sector
IEC/EN 61800-5-2:2016 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
Standard Name