Compliance With The European Machinery Directive; Wiring; Activation Switch; Cable Types And Lengths - ABB ACS880-07 Hardware Manual

214 Safe torque off function
Standard
IEC 61508-1:2010
IEC 61508-2:2010
IEC 61511:2003
EN 61800-5-2:2007
EN 62061:2005 + AC:2010
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

Wiring

The following diagrams show examples of Safe torque off wiring for
•
a single drive (page 215)
•
multiple drives (page 216)
•
multiple drives when an external 24 V DC power supply is used (page 217).
For information on the specifications of the STO input, see section
on page 125.

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 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.
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 194.
Safe torque off (XSTO)