Safety Concept (S300)

Function "Safe Torque Off "(STO)

The single channel safety function STO (SIL2/PLd) is switched from a safety switchgear (e.g. a safety relay).

The STO function serves to safely interrupt the energy supply to the motor directly at the drive. This corresponds to uncontrolled braking according to IEC 60204-1, category 0.

Drives with a hanging load must have an additional safe mechanical blocking (e.g. by a motor holding brake). The concept of this function which is standard in the S300 is tested and certified (see the attached German professional association's test report). Thus, the circuit concept to realize the safety function "Safe Torque Off" within the servo amplifiers of the product line S300 satisfies the demands to

• SIL2 according to IEC 61800-5-2
• PLd, Cat.3 according to ISO 13849-1

Wiring

Further Information

• Safety Characteristic Data
• Sistema, safety evaluation tool by IFA