Danfoss VLT AutomationDrive EZ FC 321 Operating Manual page 9

Safe Torque Off
Operating Guide
Perform a risk assessment for each stop function to determine the selection of a stop category in accordance with EN 60204-1:
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Stop Category 0 is achieved with immediate removal of power to the actuator, resulting in an uncontrolled coast to stop.
STO according to EN 61800-5-2 accomplished a Stop Category 0 stop.
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Stop Category 1 is achieved with power available to the machine actuators to achieve the stop. Power is removed from the
actuators when the stop is achieved according to EN 61800-5-2 Safe Stop 1 (SS1).
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Stop Category 2 is a controlled stop with power available to the machine actuators. A holding position under power follows
the stop.
When designing the machine application, timing and distance must be considered for a coast to stop (Stop Category 0 or STO).
For more information regarding stop categories, refer to EN 60204-1.
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Safety