KEB COMBIVERT S6 Series, Installation Manual

GB - 21

Safety Function STO

This behaviour can occur either by a short circuit of the IGBTs or by interconnection (also 

short circuit) of the control drivers. The error should be regarded as critical, if the drive re

-

mains in STO status.

3.2 

Classification of STO according IEC 61508

PFH

2.6 • 10

-12

 1/h

PFD

2.3 • 10

-7

 on demand

Proof-Test-Interval T

20 years

For SIL classification in connection with the applications consider the failure rates of the ex

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ternal switch devices for final evaluation.

3.3 

Classification of STO according EN ISO 13849

Category

4

MTTF

D

>1000 years

DC

high

For the classification within a performance level in connection with the applications consider 

the failure rates of the external switch devices for final evaluation.

3.4 

Additional instructions

•  The unit must be isolated from mains by main switch when working on parts under volt-

age.

•  Mechanical brakes must be installed additionally if external forces have effect to the drive 

axis, e.g. vertical axes (hanging loads) or rotary axes with asymmetrical weight distribu

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tion.

• 

For the protection against pollution (pollution degree 2) the installation of the units must 

be provided in environment with increased protection (e. g. control cabinet IP 54).

• 

Make sure that no small parts fall into the COMBIVERT during assembly and wiring. This 

also applies to mechanical components, which can lose small parts during operation. 

•  Check the safety functions and error responses and generate an acceptance report after 

installation.

• 

The  start-up  can  be  prevented  with  interruption  of  the  STO  signals.  STO  may  not  be 

released in case of danger according to EN 60204-1. Also note the instructions to the 

external safety switch devices.

•  Dimension the safety application by way that the corresponding input current of the safety 

functions is available for the inputs (see chapter 2.5.1).

Selection of 

suitable volt-

age sources

Use for the connection only suitable voltage sources with safe 

isolation (SELV / PELV) in accordance with VDE 0100 with nom

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inal voltage of 24 Vdc ± 10%. Pay attention on a sufficient over

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voltage category of the voltage supply.