10.3 Prohibited use
The safety functions must not be used if the drive is to be made inactive for Emergency-Off
situations. In an Emergency-Off situation, the main relay is switched off (by the Emergency-
Off button).
The device does not require maintenance. Opening the device voids the warranty. In case of
damage or malfunction the drive must be sent for repair or must be replaced.
10.4 Abbreviations used for functional safety
More abbreviations see (➜ # 12).
Abbreviation Meaning
A#, AXIS# A# or AXIS# are placeholders for the axis number. Used with keywords
(AXIS#.SAFE.STO.ACTIVATESOURCE) or signal names (STO-A-A#)
(➜ # 53) "see page 53" in this document
CCF Common cause failure
FS Functional Safety
FS1 Functional Safety Option 1 (STO)
HFT Hardware fault tolerance
MTTFd Mean time to dangerous failure
OSSD Output Switching Signal Device
PELV Protective Extra Low Voltage
PFHd Probability of dangerous failure per hour
PL Performance Level
SC Systematic Capability
SIL Safety Integrity Level
STO Safe Torque Off
TM Mission time
AKD2G-S Installation, Safety 1 | 10 Functional Safety
Kollmorgen | kdn.kollmorgen.com | S101, December 2018 125
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