7.9.3 Use as directed
The STO function is exclusively intended to provide functional safety, by preventing the
restart of a system.
To achieve this functional safety, the wiring of the safety circuits must meet the safety
requirements of IEC60204, ISO12100, IEC62061 respectively ISO13849-1.
In case of single channel control: if STO is automatically activated by a control system,
then make sure that the output of the control is monitored for possible malfunction.
To achieve PL e or SIL CL3, the safe switching of the pulse inhibitor must be tested peri-
odically by analyzing the feedback signal from the safety control (➜ # 51).
7.9.4 Prohibited Use STO
The STO function must not be used if the drive is to be made inactive for the following reas-
ons :
Cleaning, maintenance and repair operations, long inoperative periods:
In such cases, the entire system should be disconnected from the supply by the per-
sonnel, and secured (main switch).
Emergency-Off situations: the mains contactor must be switched off (by the emergency-
Off button).
7.9.5 Enclosure
Since the servo amplifier meets enclosure IP20, you must select the enclosure ensuring a
safe operation of the servo amplifier referring to the enclosure. The enclosure must meet
IP54 at least.
7.9.6 Wiring
When using STO wiring leads outside the control cabinet, the cables must be laid durably
(firmly), protected from outside damage (e.g. laying in a cable duct), in different sheathed
cables or protected individually by grounding connection.
Wiring remaining within the demanded enclosure must meet the requirements of the standard
IEC 60204-1.
7.9.7 Technical data
STO1-Enable and STO2-Enable Data
Input voltage 20 V..30 V
Input current 33 mA – 40 mA (Ieff)
Peak current 100 mA (Is)
Response time
(falling edge at STO input until energy supply
to motor is interrupted)
STO1: 1 ms
STO2: 2 ms
S748-772 Instructions Manual | 7 Technical description
Kollmorgen | kdn.kollmorgen.com | July 2019 43
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