Additional requirements for the servo drives concerning the UL approval Page 40
6 Functional safety technology
This chapter provides information on the ARS 2000 SE servo drives with the integrated safety function
STO („Safe Torque Off“).
6.1 General
The servo drive ARS 2100 SE series devices with STO are delivered with integrated functions for safety-
related motion monitoring and motion control.
Use the function “Safe Torque Off” (STO) whenever you have to reliably disconnect the energy supply to
the motor in your particular application.
6.2 Achievable safety level, Safety function
according to EN ISO 13849-1 / EN 61800-5-2
The servo drive ARS 2100 SE series devices with integrated Safe torque Off (STO) function fulfill the
basic test requirements
Category 4 / PL e according to EN ISO 13849-1,
SIL CL 3 according to EN 61800-5-2 / EN 62061 / IEC 61508,
and can be used in applications up to cat. 4 / PL e according to EN ISO 13849-1 and SIL 3 to EN 62061 /
IEC 61508.
The achievable safety level depends on the other components used to achieve a safety function.
For further information please refer to the Product Manual “STO (Safe Torque Off) for the
servo drives ARS 2000 SE”.
Mounting Instructions „Servo drives ARS 2100 SE“ Version 5.0
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