AKD Installation | 7 Technical description and data
7.16.8 Functional description
When STO function (Safe Torque Off) is not needed, then STO-Enable must be connected dir-
ectly with +24 V. The STO function is then bypassed and cannot be used.
If the STO function is in use, then the STO-Enable must be connected to the output of a
safety control or a safety relay, which at least meets the requirements of PLd, CAT 3 accord-
ing to ISO 13849 (connection diagram: (
# 62)).
SIL2/PLd Single Channel Control
With the single-channel control of the STO (SIL2/PLd) safety function, STO is switched by
one output of a safety switching device (e.g. safety relay). Erroneous engaging will not be
recognized. Therefore the output of the control must be supervised for possible malfunction.
STO ENABLE
Display
Motor has Torque Safety
0 V
0 V
n602
no
yes
0 V
+24 V
F602
no
yes
+24 V
0 V
opmode
no
no
+24 V
+24 V
opmode with 'dot'
yes
no
When STO function is engaged during operation by separating input STO from 24 V, the
motor slows down without control and the drive displays the fault F602.
SIL2/PLd Dual Channel Control (with AKD-x048 only)
With the dual-channel control of the STO (SIL2/PLd) safety function, the switch-off paths
STO-Enable1 and STO-Enable2 are switched separately by two outputs of a safety switch-
ing device (e.g. safety relay).
STO-Enable1 STO-Enable2 ENABLE
Display
Motor has Torque
Safety
0 V
0 V
0 V
n602
no
yes
0 V
0 V
+24 V
F602
no
yes
+24 V
+24 V
0 V
opmode
no
no
+24 V
+24 V
+24 V
opmode with 'dot'
yes
no
+24 V
0 V
0 V
n602
no
no
+24 V
0 V
+24 V
F602
no
no
0 V
+24 V
0 V
n602
no
no
0 V
+24 V
+24 V
F602
no
no
SIL3/PLe Dual Channel Control (with AKD-x048 only)
With the dual-channel control of the STO safety function, the switch-off paths STO-Enable1
and STO-Enable2 are switched separately by two outputs of a safety control (logical states
see table above).
To achieve PL e or SIL CL3, the safe switching of the pulse inhibitor must be tested peri-
odically by analyzing the STO-Status signals (
60
Kollmorgen | kdn.kollmorgen.com | October 2017
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