Nord Drivesystems SK 500P Series - Page 24

Functional Safety – Supplementary manual for series SK 500P
24 BU 0630 en-2020
SK 530P, SK 550P with SK CU5-STO or SK CU5-MLT
Emergency stop
button
Safety switching device Shielded
cables
1)
Frequency inverter
Use of a digital input
Reset
1) Shielded cables to exclude faults as per DIN EN ISO 13849-2
1
Supply voltage
2
Reset circuit
3
Input circuit with cross-circuit detection
4
Safety output
To implement the STO safety function, the Safety Digital Input is parameterised to the Voltage Disable
function (P424 = 1).
The Safety Digital Input with the Quick Stop function (P424 = 2) is parameterised for implementation of
the SS1-t function. The quick stop time is set via parameter P426. It must be ensured that the drive is
actually brought to standstill within the parameterised quick stop time.
Information
Category
Implementation of safety switching with only the Safety Digital Input as described above only enables
compliance with safety category 2 or Performance Level d, as a maximum (see 8.1 "Safe Pulse Block
and Safety Digital Input").
This switching version should therefore only be considered if only low requirements for functional
safety need to be fulfilled and if the risk assessment has shown that failure of the safety function can
only result in slight (usually temporary) injuries. In case of doubt, the Safe Pulse Block should always
be used (see 2.2.1 "Safe Pulse Block").
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