Safety Component Types; Safety Block Diagrams; Relevant Failure Modes - ABB ACS880-07 User Manual

38 Technical data
Drive module SIL /
frame size SIL-
CL
6...8×R8i 3
1) PFH values are according to EN ISO 13849.
2) DC applies for both high and low demand mode of operation.
3) See the Recommendation of Use CNB/M/11.050 published by the European coordination of notified bodies for lower T
requirement.
4) T
= 20a is used with high demand mode of operation. T
1

Safety component types

￭
Safety component types as defined in IEC 61508-2:
• FSO module: type B
• FSE module: type B
• drive STO circuit:
• frame sizes R1...R9 and drives with R1i...R7i inverter modules: type A
• frame sizes R10 and R11 and drives with R8i inverter modules: type B.

Safety block diagrams

￭
The components that are included in the safety data calculations are shown in the safety
block diagram(s). The components not included in the delivery are not included in the safety
data calculations.
1 POUS switch (user-defined)
2 FSO module
3 Drive STO

Relevant failure modes

￭
Relevant failure modes are:
• the FSO module detects open circuits, short circuits and redundancy failures of the POUS
input signal wirings. Similarly, it detects redundancy failures of the POUS switch when
the POUS request is on.
• internal failures of the FSO module, the FSE module, and the drive STO.
These failures are included in the failure rate value of the function.
1)
SC PL PFD
PFH
(T
[1/h]
3 e 1.94E- 1.9E-06
10
1
2)
PFD
DC
avg avg
=2a) (T =5a)
1 1
[%]
4.3E-06 ≥90
= 2a/5a is used with low demand mode of operation.
1
2
Cat. HFT CCF Mis-
sion
time
[a]
3 1 80 20
3AXD10000097591 J
3
3) 4)
T1
[a]
20/5/2
1