Safety Data (Sil, Pl) - ABB ACS880-37 Hardware Manual

Term/ Explanation
Abbreviation
SBC Safe brake control
SLS Safely-limited speed without encoder
SS1 Safe stop 1
SSE Safe stop emergency
SSM Safe speed monitor without encoder
STO Safe torque off. See chapter
Supply unit The part of the
modules and their auxiliary components such as the LCL filter.

Safety data (SIL, PL)


Abbr. Reference
Cat. EN ISO 13849-1
CCF EN ISO 13849-1
DC EN ISO 13849-1
FIT IEC 61508
HFT IEC 61508
MTTF EN ISO 13849-1
d
PFD IEC 61508
PFH IEC 61508
D
PL EN ISO 13849-1
SC IEC 61508
SFF IEC 61508
SIL IEC 61508
SILCL IEC/EN 62061
SS1 IEC/EN 61800-5-2
STO IEC/EN 61800-5-2
T1 IEC 61508
The Safe torque off function
drive that converts AC to DC for the motor. Consists of one or more supply
Description
Classification of the safety-related parts of a control system in respect
of their resistance to faults and their subsequent behavior in the fault
condition, and which is achieved by the structural arrangement of the
parts, fault detection and/or by their reliability. The categories are: B, 1,
2, 3 and 4.
Common cause failure (%)
Diagnostic coverage
Failure in time: 1E-9 hours
Hardware fault tolerance
Mean time to dangerous failure: (The total number of life units) / (the
number of dangerous, undetected failures) during a particular
measurement interval under stated conditions
Probability of failure on demand
Probability of dangerous failures per hour
Performance level. Levels a...e correspond to SIL
Systematic capability
Safe failure fraction (%)
Safety integrity level (1...3)
Maximum SIL (level 1...3) that can be claimed for a safety function or
subsystem
Safe stop 1
Safe torque off
Proof test interval. See also section
Introduction to the manual 29
(page 223).
Maintenance (page 231).