Enabling the Safe Direction function
The "Safe Direction" function is enabled with p9501.17 = 1.
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Figure 4-21 Functional principle SDI with encoder
4.12.1.2 Safe Direction without encoder
Note
You can find the parameterization for operation without encoder (p9506 = 1 or p9506 = 3) in
the commissioning screen form for the safety functional scope (Page 251).
Differences between Safe Direction with encoder and Safe Direction without encoder
● For Safe Direction without encoder, after pulse suppression the drive is unable to determine
the current speed. For this operating state, the behavior is defined using parameter p9509.8:
– p9509.8 = 1
The status signal displays "inactive".
– p9509.8 = 0
The status signal displays "active", and the drive takes on the state STO.
● Due to the less precise position recognition, "Safe Direction without encoder" requires a
larger tolerance (p9564) compared with the function with encoder.
Safety functions integrated in the drive
4.12 SDI
Safety Integrated (with SINAMICS S120)
156 Commissioning Manual, 02/2020, A5E46305916B AB
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