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Functional Safety – Supplemental manual for series SK 300P
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2.3 Examples / Implementation
The following shows some examples of solutions for the safety functions STO and SS1-t.
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2.3.1 STO function
Implementation of a safety function usually requires the use of a protective switching device. The
category of the function is determined by the component with the lowest category.
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Safe Pulse Block
Emergency stop button
1
Supply voltage
2
Reset circuit
3
Input circuit with cross-circuit detection
4
2 x safety output with a common reference (GND)
If the Safe Pulse Block is triggered for an enabled frequency inverter, this results in the error E018
(18.0 "Safety circuit"). To prevent this, the Safety Digital Input can additionally be used with the
Voltage Disable function (P424 = 1).
The typical response time can be reduced by additional use of the Safety Digital Input. A second
safety output is required to control this.
This solution is preferable, especially in cases where the switching device only checks its safety
outputs in the course of an enabling cycle, as is the case with some electro-mechanical switching
devices. A suitable inspection interval must be specified according to the safety requirements.
16
Protective switching device
Reset key
Shielded cable
Frequency inverter
BU 0830 en-4121
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