Functional Safety – Supplementary manual for series SK 500P
36 BU 0630 en-2020
4 commissioning
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Only specific issues for functional safety during commissioning are considered in the following. All
information relating to the device and its commissioning can be found in the operating manual for the
frequency inverter BU 0600.
The Safe Pulse Block is required for implementation of the safety function STO or SS1-t. The Safety
Digital Input is additionally required for the safety function SS1-t. This may also be used for
implementation of the STO safety function. For this, the Safety Digital Input must be configured with a
special function. All parameterisation tools can be used for parameterisation, e.g. the NORDAC
ACCESS BT Bluetooth stick or a bus. Calculation of the CRC checksum can only be carried out with
the NORDCON PC software. For all other methods, after parameterisation of the safety parameters
the correct CRC checksum must be entered manually (see 5.1 "Parameterisation"). Typical CRC
checksums can be obtained from the parameter description for P499 “Safety CRC” in this manual.
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4.1 Commissioning steps for STO
A safety output of the protective switching device is connected to the Safe Pulse Block (see 2.2 "
shut-down methods").
Depending on the required category, a wiring fault (short-
circuit between any particular conductors)
must be able to be excluded. It is recommended that a two-conductor shielded cable is use
Safe Pulse Block and that the shield is correctly connected (see 2.4.5 "Exclusion of wiring faults").
SK 530P, SK 550P with SK CU5-STO or SK CU5-MLT
Two safety outputs of the protective switching device are connected with the two inputs of the Safe
Pulse Block (see 2.2 "Safe shut-down methods").
Depending on the required category, a wiring fault (short-
circuit between any particular conductors)
must be able to be excluded. It is recommended that a separate three-wire shielded cable is
the Safe Pulse Block and that the shield is correctly connected (see 2.4.5 "Exclusion of wiring faults
").
If a protective switching device with OSSDs that is able to detect short circuits between the OSSDs
and external voltages is used, it may be possible to dispense with the use of a shielded cable.
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• The response time can be reduced by the additional use of the Safety Digital Input.
For this, the Safety Digital Input is parameterised with the Voltage Disable function (P424 = 1). The
different reference potentials must be considered. It is recommended that separate shielded cables
are used for the Safe Pulse Block and the Safety Digital Input and that the shields are correctly
connected (please see chapter 2.4.5 "Exclusion of wiring faults" on page 25).
It must be noted that the Safety Digital Input has a lower safety category than the Safe Pulse Block
and therefore the STO function may reduce to the longer response time of the Safe Pulse Block.
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• If the assessment of the functional safety of the end application shows that monitored starting is
necessary, “Automatic starting” (P428) must not be used (setting “0” Off). This prevents the drive
from re-starting automatically if the requirement for the Safe Pulse Block is removed.
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