05. - 07.06.2018
PCIM Europe 2018
Power Electronics | Intelligent Motion | Renewable Energy | Energy Management


Seminar 5

Functional Safety - an Introduction for Inverter and Servo Drive Developers


Sunday, 03.06.2018, 14:00 - 17:30 hrs


Arvena Park Hotel Nuremberg, Görlitzer Str. 51, 90473 Nuremberg


14:00 Functional Safety - an Introduction for Inverter and Servo Drive Developers
Prof. Dr. Jens Onno Krah, Cologne University of Applied Sciences, Köln, Deutschland
Functional safety is increasingly requested for drives. Safe Torque Off (STO) is now standard on many frequency inverters and servo drives. Safe motion and safety related field buses are an increasing demand. The technical basics of functional safety are explained in the seminar:

- Explanation of Safety Keywords
Mean Time To Fail (MTTF), Failure In Time (FIT), Safe Failure Fraction (SFF), Diagnostic Coverage (DC), Fail Safe -Fail Operational, Fault Exclusion
Category, Performance Level (PL), Safety Integrity Level (SIL)

- Safe Digital Input
Testing, calculation of FIT, DC and SFF

- Safe Digital Output
Testing, calculation of FIT, DC and SFF

- Safe Torque OFF (STO)
Basic techniques to implement STO

- Safe Brake Control (SBC)

- Safety Related Fieldbus Technology
Black Channel, Cyclic Redundancy Check

- Safety Related Motor Feedback
2 Feedback devices
Analog interface: Sin-Cos Encoder, Resolver
Digital Interface: Single-Turn, Multi-Turn
EnDAT 2.2, SCS open link, Hiperface DSL

- Safe Motion
Safe Limited Speed (SLS), Safe Limited Position (SLP), etc.

- Safe Logic, Environment Requirements
Power Supply
Clock, Voltage and Temperature Monitoring

- Safe Logic Implementation
Redundancy, Diversity
Dual CPU, Lockstep CPU, FPGA
Watchdog, Build In Self-Test (BIST), Self-Test Library (STL), Error Correction Code (ECC)
FIT Estimation

Who should attend?
This seminar is intended for designers and engineers involved in frequency inverter and servo drive design. It assumes a working knowledge of electrical engineering basics and a familiarity with inverter design principles. Knowledge of functional safety is not required.


Speaker detail

Professor Jens Onno Krah
Prof. Dr. Jens Onno Krah
Cologne University of Applied Sciences, Köln, Deutschland
Prof. Jens Onno Krah studied electrical engineering at the Bergische Universität Wuppertal and received his doctorate in 1993 from Prof. Holtz in the field of electric machine and drive research. Until February 2004 he was Technical Director responsible for the development of Kollmorgen Servo Drives. Since 2004 Prof. Krah has been teaching control technology, motion control, FPGA-based digital signal processing and functional safety at the TH Köln. The research focus is on the development of robust, safety-related and energy-efficient inverter control with programmable hardware.