AKD Installation | 6 Technical description and data
6.16.5 Technical data and pinning
Pin Signal Description
1 +24 +24 Vdc Auxiliary voltage
2 GND 24V Supply GND
3 STO STO enable (Safe Torque Off)
6.16.6 Enclosure, Wiring
Since the drive meets IP20, you must select an enclosure that permits safe operation of the
drive. The enclosure must at least meet IP54 .
If you are wiring leads that are outside the specified enclosure (IP54), the cables must be laid
durably (firmly), protected from outside damage (for example, by laying the cable in a duct),
placed in different sheathed cables, or protected individually by grounding connection.
Wiring remaining within the specified enclosure must meet the requirements of the standard
IEC 60204-1.
6.16.7 Functional description
When STO function (Safe Torque Off) is not needed, then the input STO must be connected
directly with +24 V. The function is then bypassed and cannot be used. If the STO function is
in use, then the input STO must be connected to the exit of a security control or a safety
relay, which at least meets the requirements of PLd, CAT 3 according to ISO 13849 (con-
nection diagram: ➜ p. 56). Possible states of the drive referring to STO function:
STO ENABLE Display Motor has Torque Safety SIL 2
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.
It is not possible to perform a controlled brake if the drive STO-Enable is off.
If controlled braking before the use of the STO function is necessary, the drive must be
braked and the input STO must be separated from +24 V time-delayed.
The STO function does not provide an electrical separation from the power output. If access
to the motor power terminals is necessary, the drive must be disconnected from mains
supply considering the discharging time of the intermediate circuit.
Since the STO function is a single-channel system, erroneous engaging will not be rec-
ognized. When wiring the input STO within one enclosure, the cables and the enclosure must
meet the requirements of IEC 60204-1. If you are wiring leads outside the specified enclo-
sure,then the cables must be laid durably and protected from outside damage.
54 Kollmorgen™ | May 2013
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