8 Introduction to the manual
WARNING! (With permanent magnet motors only) In case of a multiple IGBT
power semiconductor failure, the inverter system can produce an alignment
torque which maximally rotates the motor shaft by 180/p degrees regardless of
the activation of the Safe torque off function. p denotes the number of pole pairs.
WARNING! Read and obey all safety instructions in the drive hardware manual.
If you ignore them, injury or death, or damage to the equipment can occur.
This manual does not repeat the complete safety instructions of the drive but it only
includes the instructions related to the scope of this manual.
Target audience
This manual is intended for people who install, start up, use and service the drive safety
option. Read the manual before working on the drive. You are expected to know the
fundamentals of electricity, wiring, electrical components, electrical schematic symbols,
and functional safety.
Contents
The chapters of this manual are briefly described below.
Introduction to the manual (this chapter) introduces this manual and gives safety
instructions.
Option description describes the Safe torque off (STO) function of the drive and inverter
modules and lists the indications and response times of the Safe torque off function.
Installation describes the installation procedure, wiring and allowed cable type of the Safe
torque off function.
Start-up and use contains the start-up and acceptance test procedure for the Safe torque
off function and gives instructions for its use.
Maintenance and fault tracing describes the maintenance procedure, required
competence for maintenance personnel and fault tracing information for the Safe torque
off function.
Technical data contains the technical details of the ASTO-11 and ASTO-21 boards, the
safety data for the STO and example information of safety relays, safety logic and
activation switches. It also lists the related standards and directives, and contains
declarations of conformity with the European Machinery Directive.
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