AKD2G-S Installation Manual, Safety 1 | 10 Safety Manual
10.3.1 Safety Properties Overview
OSSD test pulses are not required. The inputs however are compatible with safety equip-
ment 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 3.44E-08 >65
< 3.5 ms
10.3.2 Technical Data
Safe inputs are fixed to the STO function.
When STO function (Safe Torque Off) is not needed, then all STO inputs must be connected
directly with +24 V. The STO function is then bypassed and cannot be used.
I/O hardware data
Reference ground is DGND
Galvanic isolation for 60 VDC
Activation delay about 5 µs
De-activation delay about 500 µs
Use 24 VDC ±15% PELV power supply
High level 17 VDC to 30 VDC, 5 mA to 6 mA
Low level 0 VDC to 5 VDC, max.1 mA
Pinout
X21 Signal
Description
A11 STO-A-A1
STO channel A (for axis 1)
B11 STO-B-A1
STO channel B (for axis 1)
Drives with two axes, or option IO or DX:
X22 Signal
Description
A12 STO-A-A2
STO channel A (for axis 2)
B12 STO-B-A2
STO channel B (for axis 2)
Parameters
Parameter
Description
Reads the status of STO input channel A for axis #.
Reads the status of STO input channel B for axis #.
Reads the STO status of axis #.
F9000 and W9000 are triggered for axis # only, if set
to 1 (default).
For parameter description refer to the
Safety Parameters Reference Guide
Factory Default Settings
The drive is ready to operate with pre-configured STO function.
is set to 1.
138
Kollmorgen | kdn.kollmorgen.com | S102, April 2020
