Classification Of Sto According Iec 61508; Classification Of Sto According En Iso 13849 - KEB COMBIVERT G6 Safety Manual

Calculation of the jerk:
Rotation angle of the jerk W
The probability of the jerk is < 1.84 *10
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 Classification of STO according IEC 61508
PFH
PFD
Proof-Test-Interval
For SIL classification in connection with the applications consider the failure rates of the ex-
ternal switch devices for final evaluation.
2.3 Classification of STO according EN ISO 13849
Control category
MTTF
D
DC
For the classification within a performance level in connection with the applications consider
the failure rates of the external switch devices for final evaluation.
In case of double malfunction it can lead to unwanted jerk, the
Jerks in error
rotation angle is depending on the number of poles of the se-
case
lected drive and the gear ratio.
Safety Function STO
[°] = –––––––––––––––––––––––––––––––––
R
Pole-pair number p • gear reduction ratio g
1/h.
-15
8.1 *10^-11 1/h
7.1 * 10^-6 on demand
20 years
3
>2500 years
medium
180°
GB - 11