2.3.9.2 Use as directed
The safety function STO 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 IEC 60204, ISO 12100, IEC 62061 SIL CL2 respect-
ively ISO 13849-1 PLd. If STO is automatically activated by a control system, then make
sure that the output of the control is monitored for possible malfunction.
2.3.9.3 Prohibited Use
The STO function must not be used if the drive is to be made inactive because of:
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).
2.3.9.4 Technical data STO
Safety characteristic data
The subsystems (servo amplifiers) are totally described for safety technics with the char-
acteristic data :
Unit Operation Mode EN 13849-1 EN 62061 PFH
[1/h]
T
M
[Years]
SFF
[%]
STO-Enable single channel PL d, Cat. 3 SIL CL 2 0 20 100
Pinout
Pin Signal Description
1,2 +24 +24 V DC auxiliary voltage supply,
20V..30V, 33mA – 40mA (Ieff), 100mA (Is)
3,4 DGND 24 V Supply GND
5 STO-ENABLE STO Enable (Safe Torque Off)
Signal diagram
The diagram shows how to use STO function to ensure a safe stop of the drive and error free
operation of the servo amplifier.
S300 Safety Guide | 2 English
Kollmorgen | wiki-kollmorgen.eu | December 2015 47
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