BONFIGLIOLI ACTIVE CUBE Series Applications Manual page 6

Warning!
Warning! Dangerous voltage!
6
Improper installation of the safety technique can cause an uncontrolled
starting of the drive. This may cause death, serious injuries and signifi-
cant material damage.
Safety functions may only be installed and commissioned by qualified
staff.
The STO function is not suitable for emergency switch off as per
EN 60204. An emergency switch off can be realized by installing a
mains contactor.
An emergency stop according to EN 60204 must be functioning in all
operation modes of the frequency inverter. Resetting of an emergency
stop must not result in uncontrolled starting of the drive.
The drive is started again when the function STO is no longer triggered.
In order to comply with EN 60204, it must be ensured by taking exter-
nal measures that the drive does not start without prior confirmation.
Without a mechanical brake, the drive might not stop immediately but
coast to a standstill. If this may result in personal or material damage,
additional safety measures must be taken.
If persons may be endangered after disconnection of the motor control
by STO, access to the hazard areas must be prevented until the drive
has stopped.
Check the safety function at regular intervals according to the results of
your risk assessment. BONFIGLIOLI VECTRON recommends that the
check is performed after one year, at the latest.
The STO function is one fault fail-safe. No single fault or component
failure can cause a disabled drive to produce motor shaft torque. Only
in extremely unlike combinations of component faults the motor shaft
could move jerky with sudden acceleration (maximum 180°/number of
pole pairs, for example jerky movement of 90° for 4-pole motor,
180°/2) and produce torque. It must be checked if this behavior can
cause a dangerous machine movement.
If the STO function is used, the special safety, installation and instruc-
tions on use instructions shall be complied with.
After disconnection of an external DC 24 V power supply, the DC link of
the frequency inverter is still connected to mains supply.
Even if the motor control is deactivated and the motor is coasting to a
standstill or has already stopped, high voltages may still be present on
the motor terminals.
Before working (e.g. maintenance) on live parts, the machine must
always be disconnected from mains supply (main switch). This must be
documented on the machine.
When the function "Safe Torque Off" is triggered, the motor is not iso-
lated from the DC link of the frequency inverter. High voltage levels
may be present at the motor.
Do not touch live terminals.
ACU-STOV1-01SV2-03 en
03/11