ABB ACS800-01 Manuel D'installation page 6

2
NEW (page 20): Contents)
Installation of ASTO board (Safe torque off, +Q967) contains electrical installation
instructions of the optional Safe torque off function (+Q967) of the drive and
specifications of the board.
NEW (page 24): Type code
The table below contains the new option code definition for the Safe torque off
function.
Code
+Q967
NEW (page 43): Safe torque off
The drive supports the Safe torque off (STO) function according to standards
EN 61800-5-2:2007; EN/ISO 13849-1:2008, IEC 61508, and EN 62061:2005. The
function also corresponds to an uncontrolled stop in accordance with category 0 of
EN 60204-1 and prevention of unexpected start-up of EN 1037.
The STO may be used where power removal is required to prevent an unexpected
start. The function disables the control voltage of the power semiconductors of the
drive output stage, thus preventing the inverter from generating the voltage required
to rotate the motor (see the diagram below). By using this function, short-time
operations (like cleaning) and/or maintenance work on non-electrical parts of the
machinery can be performed without switching off the power supply to the drive.
Update Notice
Description
Safe torque off (STO)