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Appendix: Safe Torque Off (STO) 173
13
Appendix: Safe Torque Off
(STO)
What this chapter contains
The appendix describes the basics of the Safe torque off function (STO) for the
MicroFlex e150. In addition, application features and technical data for the safety
system calculation are presented.
Basics
The STO function disables the control voltage of the power semiconductors of the
drive output stage, which prevents the inverter generating the voltage required to
rotate the motor (see 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.
The drive supports the Safe Torque Off (STO) function according to standards
IEC 61800-5-2, EN 61508:2010, EN ISO 13849-1 and IEC 62061:2005.
See
Safety Manual: Safe Torque Off (STO) function for MicroFlex e150 drives
(LT0313...) before using the STO function.
Summary of Contents for MicroFlex e150
Page 1: ...ABB motion control User s manual MicroFlex e150 servo drive MN1961WEN ...
Page 4: ......
Page 20: ...20 Introduction to the manual ...
Page 26: ...26 Hardware description ...
Page 32: ...32 Mechanical installation ...
Page 42: ...42 Planning the electrical installation ...
Page 116: ...116 Start up ...
Page 126: ...126 Fault tracing ...
Page 152: ...152 Technical data EtherCAT Conformance Test Certificate ...
Page 162: ...162 Technical data ...
Page 178: ...178 Appendix Safe Torque Off STO STO function TüV certificate ...