External Safety Control Equipment; External Dc 24 V Power Supply - BONFIGLIOLI Vectron ACTIVE CUBE Applications Manual

7.2

External Safety Control Equipment

Safety control equipment, upon request (e.g. actuation of emergency stop or access to hazard area,
must trigger appropriate responses in order to protect people, the machine and the environment.
They evaluate sensor signals or safely switch off dangerous states.
External safety control devices must meet the following requirements:
− External safety control equipment and safety modules for control of the digital inputs (STO) must
meet one of the following classifications, to meet the classification of the ACU device:
PL d according to EN ISO 13849-1
o
SIL 2 according to IEC 61508
o
Category 3 according to EN 954-1
o
the whole installation meets these requirements
o
− The switching capacity of the safety control equipment must be designed for the maximum per-
missible, limited output current of the DC 24 power supply. Comply with the instructions of the
manufacturer of the safety control equipment on the permissible contact load and any safeguards
to be provided for the safety contacts.
The emergency stop device must comply with Standard EN ISO 13850.
−
If a safety request (e.g. emergency stop actuated or sensor signals that safety door is open) is
−
reset (emergency stop unlocked, safety door closed) this alone shall not result in a restart of the
drive. Restart may only occur after the safety control device has been reset.
External safety control devices evaluate sensors:
Examples of contact sensors:
− Emergency stop control device for stop in dangerous situations
Position switch, e.g. for monitoring slide doors, safety grids or moving machine parts
−
Examples of no-contact sensors:
Light barriers, e.g. for monitoring areas with dangerous movements
−
− Light curtains
7.3

External DC 24 V power supply

During projection and installation of a DC 24 V supply connected to the frequency inverter comply
with the following instruction. This also includes supply of a safety control device the output of which
is connected to a control input (including STOA and STOB) of the frequency inverter.
CAUTION
Use a suited SELV/PELV voltage supply, which rated voltage has to be
DC 24 V ±10 %. The largest overvoltage must not exceed DC 32 V in the case of a
fault (one fault safety). The one fault safety has to be realized with an overvoltage
protection of the mains supply (overvoltage protection OVP with limiting the output
voltage to a maximum of DC 32 V) or an external wiring like a Crowbar. An adequate
overvoltage category of the voltage supply has to be ensured.
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