10.1.1 Use as directed
Safety functions are intended to reduce the risk of the machine operation to the required tolerable risk. To achieve
functional safety, the wiring of the safety circuits must meet the safety requirements of IEC 60204, ISO 12100 and
ISO 13849.
l
The network the drive is connected to must be secured according to state-of-the-art
information technology security requirements.
l
The IT specialists shall analyze whether further security requirements are applicable to
ensure functional safety.
l
The drive firmware can be updated. The parameter sets must be reloaded, verified and
proof tested before normal operation is started.
l
In certain types of machinery, two motors drive a single mechanical axis. It is the
responsibility of the user to ensure that a fault reaction on the first motor-drive set is also
carried out on the second motor-drive set and vice versa. Safe I/O and/or a safe fieldbus
such as FSoE can be used to achieve this.
10.1.2 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 STO function requires two-channel control if the performance level SIL2 / PLd Cat.3 in the system is to be
achieved. The connection of a constant 24 VDC voltage to one of the STO inputs is not permitted if the safety
function is to be used.
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 replacement if it cannot be repaired.
10.1.3 Abbreviations used for functional safety
More abbreviations see (➜ # 13).
Abbreviation Meaning
A#, AXIS#
A# or AXIS# are placeholders for the axis number. Used with parameters
(AXIS#.SAFE.STO.ACTIVE) or signal names (STO-A-A#)
(➜ # 53) "see page 53" in this document
➜ xyz "see chapter xyz" in this document
CCF Common Cause Failure
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
SFF Safe Failure Fraction
SIL Safety Integrity Level
STO Safe Torque Off
TM Mission Time
AKD2G-S Installation Manual, Safety 1
Kollmorgen | kdn.kollmorgen.com | S103, March 2023 181
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