Functional Safety – Supplementary manual for series SK 500P
20 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), delayed by a safety timing element
Actuation of the emergency stop button (call-up of the safety function) initially triggers a controlled
stopping action via the Safety Digital Input. In this case, it must be ensured that the drive is brought to
standstill within the parameterised “Quick stop time” (P426). After the elapse of a delay time which is
controlled by the protective switching device, the STO function is triggered via the Safe Pulse Block.
The delay time must be dimensioned so that the delay is longer than the quick stop time plus the “DC
Run-on time” (P559). The delay time must be selected so as to be fail-safe.
After the delay time which is set in the protective switching device has elapsed, the frequency inverter
always switches to the STO function. This also applies in the case of failure of the controlled stopping
action.
SK 500P series frequency inverters are equipped with additional control which is set via the “Safety
SS1 max. time” parameter (P423). If the motor is not stopped within the “Safety SS1 max time”
(P423), the frequency inverter performs the fault response action and generates an error message.
I.e. in this case the motor also runs down to a standstill.
A separate shielded cable must be used to connect each of the safety outputs. If a protective
switching device with cross-circuit monitoring of OSSD outputs is used, 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 SS1-t safety function via the Safety Digital Input and
activation of the STO function via the Safe Pulse Block, the frequency inverter can also only fulfil the
requirements of category 2 and PL d.
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