Terms And Abbreviations - ABB ACS880-07 User Manual

14 Introduction to the manual

Terms and abbreviations

Term
Cat.
CCF
DC
Frame, frame size
FSE-31
FSO-21
HFT
IGBT
PFD
avg
PFH
PL
PLC
POUS
Safety function re-
sponse time
SAR
SBC
SC
SIL
SILCL
SLS
SLS monitoring limit
SMS
SS1
SSE
SSM
STO
T1
TP
Zero speed
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. (EN ISO 13849-1)
Common cause failure (%) (EN ISO 13849-1)
Diagnostic coverage (EN ISO 13849-1)
Physical size of the drive or power module
Optional pulse encoder interface module for safety encoder
Safety functions module which supports the FSE-31 module and the use of safety
encoders
Hardware fault tolerance (IEC 61508)
Insulated gate bipolar transistor
Average probability of dangerous failure on demand (IEC 61508)
Average frequency of dangerous failures per hour (IEC 61508)
Performance level. Levels a...e correspond to SIL (EN ISO 13849-1)
Programmable logic controller
Prevention of unexpected start-up
Worst case elapsed time following an actuation of a safety sensor connected to a
fieldbus before the corresponding safe state of its safety actuator(s) is achieved in
the presence of errors or failures in the safety function channel.
Safe acceleration range
Safe brake control
Systematic capability (IEC 61508)
Safety integrity level (1...3) (IEC 61508)
Maximum SIL (level 1...3) that can be claimed for a safety function or subsystem
(IEC/EN 62061)
Safely-limited speed
The speed limit at which SLS monitoring is started, located in the middle of SLS trip
limit and SLS limit.
Safe maximum speed
Safe stop 1 (IEC/EN 61800-5-2)
Safe stop emergency
Safe speed monitor without encoder
Safe torque off (IEC/EN 61800-5-2)
Proof test interval. Defines the probabilistic failure rate (PFH or PFD) for the safety
function or subsystem. Performing a proof test at a maximum interval of T1 is required
to keep the SIL capability valid. The same interval must be followed to keep the PL
capability (EN ISO 13849) valid. Note that any T1 values given cannot be regarded
as a guarantee or warranty.
Test pulse
For safety functions, the zero speed limit indicates the completion of the safe stopping
function.