Functional Safety – Supplementary manual for series SK 500P
18 BU 0630 en-2020
SK 530P, SK 550P with SK CU5-STO or SK CU5-MLT
Input circuit with cross-circuit detection
2 x safety output with a common reference (GND)
A separate shielded cable must be used to connect each of the safety outputs. However, with the use
of a protective switching device with cross-circuit monitoring of OSSD outputs, the cables of both
safety outputs can also be run in a common shielded cable.
The requirements for category 4 and PL e are only fulfilled by the Safe Pulse Block. The Safety Digital
Input only achieves category 2 and PL d (Performance Level d).
During the period between activation of the safety function via the Safety Digital Input and activation of
the STO via the Safe Pulse Block, the frequency inverter can also only fulfil category 2 and PL d.
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