7.16.3 Use as directed
The STO function is exclusively intended to provide a functional safe stop of the motion sys-
tem. To achieve this functional safety, the wiring of the safety circuits must meet the safety
requirements of IEC 60204, ISO 12100 and ISO 13849.
Use the following functional sequence when the STO function is used:
1. Brake the drive in a controlled manner (speed setpoint = 0 V).
2. When speed = 0 rpm, disable the drive (enable = 0 V).
3. If a suspended load is present, block the drive mechanically.
4. Activate the STO function.
7.16.4 Prohibited use
The STO function must not be used if the drive is to be made inactive for:
Cleaning, maintenance and repair operations, long inoperative periods. In such cases, the
entire system should be disconnected from the supply and secured (main switch).
Emergency-Off situations. In an Emergency-Off situation, the main contactor is switched
off (by the Emergency-Off button).
7.16.5 Technical data and pinout
AKD-x003 up to AKD-x024
Input STO (X1)
Reference ground is GND
24 V ±10%, 45 mA
Galvanic isolation for 250 VDC
Reaction time < 10 ms
Pin Signal Description
1 +24 +24 VDC Auxiliary voltage
2 GND 24V Supply GND
3 STO STO enable (Safe Torque Off)
AKD Installation | 7 Technical description and data
Kollmorgen | kdn.kollmorgen.com | October 2017 57
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