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GB - 11

Safety Function STO

Jerks in error

case

In case of double malfunction it can lead to unwanted jerk, the

rotation angle is depending on the number of poles of the se-

lected drive and the gear ratio.

Calculation of the jerk:

Rotation angle of the jerk WR [°] =

180°

–––––––––––––––––––––––––––––––––

Pole-pairnumberp•gearreductionratiog

The probability of the jerk is < 1.84 *10

-15

1/h.

This behaviour can occur by a short circuit of the IGBTs. The error should be regarded as

critical, if the drive remains in STO status.

2.2 ClassicationofSTOaccordingIEC61508

PFH 8.1 *10^-11 1/h

PFD 7.1 * 10^-6 on demand

Proof-Test-Interval 20 years

ForSILclassicationinconnectionwiththeapplicationsconsiderthefailureratesoftheex-

ternalswitchdevicesfornalevaluation.

2.3 ClassicationofSTOaccordingENISO13849

Control category 3

MTTF

>2500 years

DC medium

Fortheclassicationwithinaperformancelevelinconnectionwiththeapplicationsconsider

thefailureratesoftheexternalswitchdevicesfornalevaluation.

KEB COMBIVERT G6 Safety Manual

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