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9
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Safe Torque Off (STO)
Application Example 4
Function/Action
Response/Reaction
Protection Level
EN 954-1
Safety door monitoring or
emergency shut-down with
protection monitoring switch and
time delay of several drives
Active braking occurs when the safety
door is opened, the emergency shutdown switch is activated or tripping of
the ‚STO’ occurs due to time delay.
Cat. 4
ISO 13849-1
PL e
Stop Cat.
According to
EN60204
1
Important
The category 4 and PL e protection level can only be achieved with an active STO-Power-On-Test.
Explanation
The protection switch unit A1 must be set up with a fail-safe time delay as determined and required by
the specific category relating to the application environment.
The 638 Servo Drive must be properly configured for the operating environment
(See: Chapter ■ Configuration and Parameter Settings). Only 16 drives could plug together in a group.
Note
The acknowledgement is only necessary, when after the cancellation of the STO function by the
automatic start-up, a potential danger for the people in the area or the equipment exists.
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07-02-12-02-EN-V0608.doc / Type: 638