Functional Safety – Supplementary manual for series SK 500P
14 BU 0630 en-2020
SK 510P, SK 540P
In this case the Safety Digital Input with contact VISD_24V has the reference potential GND. This is
the same reference potential as for all other analogue and digital inputs and outputs of the frequency
inverter. For this reason, the Safety Digital Input cannot be triggered by disconnecting the reference
potential.
SK 530P, SK 550P with SK CU5-STO or SK CU5-MLT
The Safety Digital Input of the CU5 modules has a separate reference potential VISD_0V. I.e. in this
case this reference potential can be disconnected to trigger the Safety Digital Input. Preferably, the
VISD_24V contact is disconnected
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2.3 Safety functions
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Mechanical brake failure
Control of a mechanical brake by means of the frequency inverter is not fail-safe. Triggering of the
STO and the fault response function causes the application of a mechanical brake which is controlled
by the frequency inverter. The brake takes the entire load of the drive units and all of its rotating
masses and attempts to stop it.
A brake which is not designed to take the full load (e.g. a holding brake) may be damaged and may
fail. This can cause severe or fatal injuries or damage to the equipment, e.g. due to falling loads.
• Design the brake as an operating brake
• Ensure that the drive unit is stopped before the STO function is activated.
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2.3.1 Safe Torque Off, STO
The STO function prevents the supply of motive power to the motor. According to ISO 1411, this
function can be used to prevent unexpected starting and/or switch off the driving torque as quickly as
possible (see technical data response time) and allow the drive run down to a standstill (motor with
work machine).
This behaviour corresponds to stop category 0 (uncontrolled stopping) according to EN 60204-1.
Depending on the application the movement while running down to a standstill can cause a hazard for
an undefined time. Detection of whether or when the drive unit has achieved a safe state is not
integrated into the frequency inverter.
Depending on the switching equipment and use of a safe shut-down method, an STO function with
safety category 4 as per DIN EN ISO 13849-1 can be implemented.
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Bei einer Synchronmaschine kann es beim Versagen des Leistungsteils des Frequenzumrichters trotz
aktivierter STO-Funktion zu einer Ausrichtbewegung um eine Polteilung kommen.
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