Safety Function Sto; Description Of Sto - KEB COMBIVERT F6 Instructions For Use Manual

DANGER
WARNING
DANGER
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9 Safety function STO

Improper installation of safety technology!
Death and serious bodily injuries.
a) Therefore the safety functions may only be installed and put into operation by
qualified personnel which are trained in safety technology.
b) Check the safety functions and error responses and generate an acceptance
report after installation.
Electronic protective devices are used to integrate safety functions into the drive
control system in order to minimise or eliminate hazards caused by malfunctions in
machines.
The integrated safety functions replace the time-consuming installation of external
safety components. The safety functions can be requested or triggered by a fault.
Safety functions protect persons from mechanical damage when project planning,
installation and operation are carried out properly.
Failure of safety functions
No protection
ü To ensure the safety permanently:
a) The safety functions must be checked in regular intervals.
b) The intervals result from the risk analysis.
c) The useful life is limited to 20 years. After this time the unit must be replaced.

9.1 Description of STO

STO (Safe Torque Off) "Safe Torque Off"
In hazardous areas, set-up or troubleshooting work may be necessary where pro-
tective devices such as mains or motor contactors should not be activated. The
safety function STO
Compared to disconnection by mains contactors or motor contactors, the integ-
rated safety function enables the drives of a system to be easily combined into
functional groups. The safely switched off torque can thus be limited to certain
plant areas. Depending on the application, the use of mains or motor contactors
can be omitted by using STO.
In error case or on demand, the power semiconductors of the drive module are
switched off and no energy is supplied to the drive which would cause rotation or
torque (or in the case of a linear drive, movement or force). If an error occurs, the
system can still be switched off safely or remain switched off.
Continue mains voltage with active STO function!
Electric Shock
a) Always switch off the power supply before working on the device.
b) Await discharge time.
Another advantage is that the charging and discharging time of the DC link must
not be considered. This means that the system is ready for operation again more
quickly after an operational interruption.
Safety function STO | 9
can be used there.
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