10.2 Verification
Check and verify the STO wiring (examples (➜ # 185)). The installation must be verified by trained personnel after
any changes to the installation. The expertise of the personnel must beappropriate tothe complexity and safety
integrity level of the drive system.
Diagnostic test
You must test the STO function after initial start of the axis, after each intervention into
the wiring of the system, or after exchange of one or several components of the drive
system. The proof test interval is one year to meet the required PFH.
Precondition: AXIS#.SAFE.STO.REPORTFAULT = 1
Warning: Do not enter hazardous area during proof test!
Method 1, axis remains enabled Method 2, axis disabled
1. Stop the axis to standstill.
2. Caution: Block vertical load.
3. Keep the axis enabled.
4. Activate the STO function for
example by opening the protective
screen.
5. The axis displays fault F9000.
1. Stop the axis to standstill.
2. Caution: Block vertical load.
3. Disable the axis.
4. Activate the STO function, for example, by opening the
protective screen
5. The axis displays fault W9000.
10.3 Safety Function Option 1 (I/O, SIL2 PLd)
The safety function STO on the AKD2G with functional safety option 1 is certified.
The drive is ready to operate with pre-configured STO
function.
Standards
Standard Content
ISO 13849:2015 Safety of machinery: Safety-related parts of control systems
IEC 62061:2015 Functional safety of electrical/electronic/programmable electronic safety-related systems
Available Safety Functions
Abbr. Function Activation Refer to
STO Safe Torque Off Safe digital inputs for one or for both axis (➜ # 185)
10.3.1 Safety Properties Overview
OSSD test pulses are not required. The inputs however are compatible with safety equipment that emits test pulses.
Incoming test pulses of up to 1 ms duration are ignored. The dwell time of the test pulses should not exceed 10%.
The hardware fault tolerance is HFT = 1 according to IEC 61508. Two faults might lead to loss of the safety
functions.
The systematic capability according to IEC 61508 for the safety-related subsystems of the drive are SC = 2. TM = 20
Years, SFF = 75%.
Function ISO
13849-1
MTTF
d
Years
DC
AVG
[%]
IEC
62061
PFH [1/h] CCF
[%]
Response
time
STO dual channel PL d, Cat. 3 ≥100 ≥60 SIL 2 2.18E-08 >65 < 3.5 ms
AKD2G-S Installation Manual, Safety 1
Kollmorgen | kdn.kollmorgen.com | S103, March 2023 183
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