Classification Of Sto According Iec 61508; Classification Of Sto According En Iso 13849; Safe Brake Control (Safe Brake Control - Sbc); Requirements For The Brake - KEB COMBIVERT F6 Instructions For Use Manual

SAFETY FUNCTIONS

3.2.2 Classification of STO according IEC 61508

PFH
PFD
Proof-Test-Interval T
For SIL classification in connection with the applications consider the failure rates of the external
switch devices for final evaluation.

3.2.3 Classification of STO according EN ISO 13849

Category
MTTF
D
DC
Table 3: Classifications of STO
For the classification within a performance level in connection with the applications consider the
failure rates of the external switch devices for final evaluation.
3.3 Safe brake control (Safe Brake Control – SBC)
The safety module type1 can safety control an external brake. The circuit operates on two channels.
Thereby brake release is only possible by the control in the COMBIVERT if both inputs are supplied
(SBC inputs see chapter 4).
The two channels are realized with a diverse high-side and low-side switch. These are tested on their
switching ability each hour.

3.3.1 requirements for the brake

Voltage supply
Absolute maximum current
Free-wheeling circuit
Table 4: Requirements for the brake
1) A lower maximum current can be permissible depending on the control board and the oper
ating mode. For more information, see the COMBIVERT installation manual.
2.6 • 10
2.3 • 10
20 years
4
>1000 years
high
24 Vdc ±10 %
3.3 A (limited by safety module type 1)
integrated in COMBIVERT
1/h
-12
on demand
-7
1)
19